diff --git a/.github/workflows/ci-internal-apps.yaml b/.github/workflows/ci-internal-apps.yaml
index be5d476122..7339b85056 100644
--- a/.github/workflows/ci-internal-apps.yaml
+++ b/.github/workflows/ci-internal-apps.yaml
@@ -66,7 +66,7 @@ jobs:
           // keep this PR small while the remaining apps are made CI-ready. Remove an
           // app from this list once its checks pass, and delete the list entirely
           // once every application is covered.
-          const CI_EXCLUDED_APPLICATIONS = ['call-recording', 'exa', 'people-data-labs', 'self-hosting', 'twenty-discord', 'twenty-fireflies', 'twenty-for-twenty', 'twenty-linear', 'twenty-meeting-bot', 'twenty-partners', 'twenty-slack'];
+          const CI_EXCLUDED_APPLICATIONS = ['call-recording', 'exa', 'people-data-labs', 'self-hosting', 'twenty-discord', 'twenty-fireflies', 'twenty-for-twenty', 'twenty-linear', 'twenty-meeting-bot', 'twenty-partners'];
           const eventName = process.env.EVENT_NAME;
           const changedFiles = JSON.parse(process.env.CHANGED_FILES || '[]');
           const changedApps = new Set();
diff --git a/packages/twenty-apps/.oxlintrc.base.json b/packages/twenty-apps/.oxlintrc.base.json
new file mode 100644
index 0000000000..58b5a7f094
--- /dev/null
+++ b/packages/twenty-apps/.oxlintrc.base.json
@@ -0,0 +1,15 @@
+{
+  "rules": {
+    "no-restricted-imports": [
+      "error",
+      {
+        "patterns": [
+          {
+            "group": ["twenty-shared", "twenty-shared/*"],
+            "message": "twenty-apps applications must not import from twenty-shared directly. Import the runtime types and helpers you need from twenty-sdk instead so the app bundle stays minimal."
+          }
+        ]
+      }
+    ]
+  }
+}
diff --git a/packages/twenty-apps/internal/call-recording/.oxlintrc.json b/packages/twenty-apps/internal/call-recording/.oxlintrc.json
index 460199b1e6..bce62aedde 100644
--- a/packages/twenty-apps/internal/call-recording/.oxlintrc.json
+++ b/packages/twenty-apps/internal/call-recording/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript", "import", "unicorn"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/exa/.oxlintrc.json b/packages/twenty-apps/internal/exa/.oxlintrc.json
index 87c62c5183..34c54bff59 100644
--- a/packages/twenty-apps/internal/exa/.oxlintrc.json
+++ b/packages/twenty-apps/internal/exa/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/people-data-labs/.oxlintrc.json b/packages/twenty-apps/internal/people-data-labs/.oxlintrc.json
index 670fc042c4..ee3eba2498 100644
--- a/packages/twenty-apps/internal/people-data-labs/.oxlintrc.json
+++ b/packages/twenty-apps/internal/people-data-labs/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript", "import", "unicorn"],
   "categories": {
     "correctness": "off"
@@ -44,23 +45,5 @@
       }
     ],
     "typescript/no-explicit-any": "off"
-  },
-  "overrides": [
-    {
-      "files": ["**/*.logic-function.ts", "**/logic-functions/**/*.ts"],
-      "rules": {
-        "no-restricted-imports": [
-          "error",
-          {
-            "patterns": [
-              {
-                "group": ["twenty-shared", "twenty-shared/*"],
-                "message": "Logic functions must not import from twenty-shared directly. Import runtime types and helpers from `twenty-sdk/logic-function` instead so the logic-function bundle stays minimal."
-              }
-            ]
-          }
-        ]
-      }
-    }
-  ]
+  }
 }
diff --git a/packages/twenty-apps/internal/self-hosting/.oxlintrc.json b/packages/twenty-apps/internal/self-hosting/.oxlintrc.json
index 87c62c5183..34c54bff59 100644
--- a/packages/twenty-apps/internal/self-hosting/.oxlintrc.json
+++ b/packages/twenty-apps/internal/self-hosting/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-discord/.oxlintrc.json b/packages/twenty-apps/internal/twenty-discord/.oxlintrc.json
index e0ce53c21f..958be72869 100644
--- a/packages/twenty-apps/internal/twenty-discord/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-discord/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-fireflies/.oxlintrc.json b/packages/twenty-apps/internal/twenty-fireflies/.oxlintrc.json
index e0ce53c21f..958be72869 100644
--- a/packages/twenty-apps/internal/twenty-fireflies/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-fireflies/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-for-twenty/.oxlintrc.json b/packages/twenty-apps/internal/twenty-for-twenty/.oxlintrc.json
index 87c62c5183..34c54bff59 100644
--- a/packages/twenty-apps/internal/twenty-for-twenty/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-for-twenty/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-last-contact/.oxlintrc.json b/packages/twenty-apps/internal/twenty-last-contact/.oxlintrc.json
index a1d10264b4..2c2035b0fe 100644
--- a/packages/twenty-apps/internal/twenty-last-contact/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-last-contact/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["react", "typescript", "import", "unicorn"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-linear/.oxlintrc.json b/packages/twenty-apps/internal/twenty-linear/.oxlintrc.json
index 87c62c5183..34c54bff59 100644
--- a/packages/twenty-apps/internal/twenty-linear/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-linear/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
diff --git a/packages/twenty-apps/internal/twenty-meeting-bot/.oxlintrc.json b/packages/twenty-apps/internal/twenty-meeting-bot/.oxlintrc.json
index 369b9cfd76..34c54bff59 100644
--- a/packages/twenty-apps/internal/twenty-meeting-bot/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-meeting-bot/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
@@ -15,23 +16,5 @@
       }
     ],
     "typescript/no-explicit-any": "off"
-  },
-  "overrides": [
-    {
-      "files": ["**/*.logic-function.ts", "**/logic-functions/**/*.ts"],
-      "rules": {
-        "no-restricted-imports": [
-          "error",
-          {
-            "patterns": [
-              {
-                "group": ["twenty-shared", "twenty-shared/*"],
-                "message": "Logic functions must not import from twenty-shared directly. Import runtime types and helpers from `twenty-sdk/logic-function` instead so the logic-function bundle stays minimal."
-              }
-            ]
-          }
-        ]
-      }
-    }
-  ]
+  }
 }
diff --git a/packages/twenty-apps/internal/twenty-partners/.oxlintrc.json b/packages/twenty-apps/internal/twenty-partners/.oxlintrc.json
index 369b9cfd76..34c54bff59 100644
--- a/packages/twenty-apps/internal/twenty-partners/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-partners/.oxlintrc.json
@@ -1,5 +1,6 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
+  "extends": ["../../.oxlintrc.base.json"],
   "plugins": ["typescript"],
   "categories": {
     "correctness": "off"
@@ -15,23 +16,5 @@
       }
     ],
     "typescript/no-explicit-any": "off"
-  },
-  "overrides": [
-    {
-      "files": ["**/*.logic-function.ts", "**/logic-functions/**/*.ts"],
-      "rules": {
-        "no-restricted-imports": [
-          "error",
-          {
-            "patterns": [
-              {
-                "group": ["twenty-shared", "twenty-shared/*"],
-                "message": "Logic functions must not import from twenty-shared directly. Import runtime types and helpers from `twenty-sdk/logic-function` instead so the logic-function bundle stays minimal."
-              }
-            ]
-          }
-        ]
-      }
-    }
-  ]
+  }
 }
diff --git a/packages/twenty-apps/internal/twenty-slack/.gitignore b/packages/twenty-apps/internal/twenty-slack/.gitignore
new file mode 100644
index 0000000000..6cd0610624
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/.gitignore
@@ -0,0 +1,38 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn
+
+# codegen
+generated
+
+# testing
+/coverage
+
+# dev
+/dist/
+
+.twenty
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# typescript
+*.tsbuildinfo
+*.d.ts
diff --git a/packages/twenty-apps/internal/twenty-slack/.nvmrc b/packages/twenty-apps/internal/twenty-slack/.nvmrc
new file mode 100644
index 0000000000..341cb50613
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/.nvmrc
@@ -0,0 +1 @@
+24.5.0
diff --git a/packages/twenty-apps/internal/twenty-slack/.oxlintrc.json b/packages/twenty-apps/internal/twenty-slack/.oxlintrc.json
index e0ce53c21f..2c2035b0fe 100644
--- a/packages/twenty-apps/internal/twenty-slack/.oxlintrc.json
+++ b/packages/twenty-apps/internal/twenty-slack/.oxlintrc.json
@@ -1,18 +1,58 @@
 {
   "$schema": "./node_modules/oxlint/configuration_schema.json",
-  "plugins": ["typescript"],
+  "extends": ["../../.oxlintrc.base.json"],
+  "plugins": ["react", "typescript", "import", "unicorn"],
   "categories": {
     "correctness": "off"
   },
   "ignorePatterns": ["node_modules", "dist"],
   "rules": {
+    "func-style": ["error", "declaration", { "allowArrowFunctions": true }],
+    "no-console": "off",
+    "no-control-regex": "off",
+    "no-debugger": "error",
+    "no-duplicate-imports": "error",
+    "no-undef": "off",
     "no-unused-vars": "off",
+    "no-redeclare": "off",
+    "import/no-duplicates": "error",
+    "typescript/no-redeclare": "error",
+    "typescript/ban-ts-comment": "error",
+    "typescript/consistent-type-imports": [
+      "error",
+      {
+        "prefer": "type-imports",
+        "fixStyle": "inline-type-imports"
+      }
+    ],
+    "typescript/explicit-function-return-type": "off",
+    "typescript/explicit-module-boundary-types": "off",
+    "typescript/no-empty-object-type": [
+      "error",
+      {
+        "allowInterfaces": "with-single-extends"
+      }
+    ],
+    "typescript/no-empty-function": "off",
+    "typescript/no-explicit-any": "off",
     "typescript/no-unused-vars": [
       "warn",
       {
+        "vars": "all",
+        "varsIgnorePattern": "^_",
+        "args": "after-used",
         "argsIgnorePattern": "^_"
       }
     ],
-    "typescript/no-explicit-any": "off"
+    "react/no-unescaped-entities": "off",
+    "react/prop-types": "off",
+    "react/jsx-key": "off",
+    "react/display-name": "off",
+    "react/jsx-uses-react": "off",
+    "react/react-in-jsx-scope": "off",
+    "react/jsx-no-useless-fragment": "off",
+    "react/jsx-props-no-spreading": ["error", { "explicitSpread": "ignore" }],
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn"
   }
 }
diff --git a/packages/twenty-apps/internal/twenty-slack/.yarn/install-state.gz b/packages/twenty-apps/internal/twenty-slack/.yarn/install-state.gz
index 125360524e..9f12c12c15 100644
Binary files a/packages/twenty-apps/internal/twenty-slack/.yarn/install-state.gz and b/packages/twenty-apps/internal/twenty-slack/.yarn/install-state.gz differ
diff --git a/packages/twenty-apps/internal/twenty-slack/.yarnrc.yml b/packages/twenty-apps/internal/twenty-slack/.yarnrc.yml
new file mode 100644
index 0000000000..3186f3f079
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/.yarnrc.yml
@@ -0,0 +1 @@
+nodeLinker: node-modules
diff --git a/packages/twenty-apps/internal/twenty-slack/package.json b/packages/twenty-apps/internal/twenty-slack/package.json
index 4f71201856..6a747e6e0c 100644
--- a/packages/twenty-apps/internal/twenty-slack/package.json
+++ b/packages/twenty-apps/internal/twenty-slack/package.json
@@ -16,20 +16,25 @@
     "twenty": "twenty",
     "lint": "oxlint -c .oxlintrc.json .",
     "lint:fix": "oxlint --fix -c .oxlintrc.json .",
+    "typecheck": "tsgo --noEmit -p tsconfig.spec.json",
     "test": "vitest run",
-    "test:watch": "vitest"
+    "test:watch": "vitest",
+    "test:unit": "vitest run --config vitest.unit.config.ts"
   },
   "dependencies": {
-    "@slack/web-api": "^7.8.0",
-    "twenty-sdk": "2.13.0"
+    "@slack/web-api": "^7.8.0"
   },
   "devDependencies": {
     "@types/node": "^24.7.2",
     "@types/react": "^18.2.0",
+    "@typescript/native-preview": "^7.0.0-dev.20260116.1",
     "oxlint": "^0.16.0",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
+    "twenty-client-sdk": "^2.14.0",
+    "twenty-sdk": "^2.14.0",
     "typescript": "^5.9.3",
+    "vite-tsconfig-paths": "^4.2.1",
     "vitest": "^4.0.0"
   }
 }
diff --git a/packages/twenty-apps/internal/twenty-slack/src/__tests__/global-setup.ts b/packages/twenty-apps/internal/twenty-slack/src/__tests__/global-setup.ts
new file mode 100644
index 0000000000..e0f8c23b05
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/__tests__/global-setup.ts
@@ -0,0 +1,87 @@
+import * as fs from 'fs';
+import * as os from 'os';
+import * as path from 'path';
+
+import { appDevOnce, appUninstall } from 'twenty-sdk/cli';
+
+const APP_PATH = process.cwd();
+const CONFIG_DIR = path.join(os.homedir(), '.twenty');
+
+function validateEnv(): { apiUrl: string; apiKey: string } {
+  const apiUrl = process.env.TWENTY_API_URL;
+  const apiKey = process.env.TWENTY_API_KEY;
+
+  if (!apiUrl || !apiKey) {
+    throw new Error(
+      'TWENTY_API_URL and TWENTY_API_KEY must be set.\n' +
+        'Start a local server: yarn twenty docker:start\n' +
+        'Or set them in vitest env config.',
+    );
+  }
+
+  return { apiUrl, apiKey };
+}
+
+async function checkServer(apiUrl: string) {
+  let response: Response;
+
+  try {
+    response = await fetch(`${apiUrl}/healthz`);
+  } catch {
+    throw new Error(
+      `Twenty server is not reachable at ${apiUrl}. ` +
+        'Make sure the server is running before executing integration tests.',
+    );
+  }
+
+  if (!response.ok) {
+    throw new Error(`Server at ${apiUrl} returned ${response.status}`);
+  }
+}
+
+function writeConfig(apiUrl: string, apiKey: string) {
+  const payload = JSON.stringify(
+    {
+      remotes: {
+        local: { apiUrl, apiKey, accessToken: apiKey },
+      },
+      defaultRemote: 'local',
+    },
+    null,
+    2,
+  );
+
+  fs.mkdirSync(CONFIG_DIR, { recursive: true });
+  fs.writeFileSync(path.join(CONFIG_DIR, 'config.test.json'), payload);
+}
+
+export async function setup() {
+  const { apiUrl, apiKey } = validateEnv();
+
+  await checkServer(apiUrl);
+
+  writeConfig(apiUrl, apiKey);
+
+  await appUninstall({ appPath: APP_PATH }).catch(() => {});
+
+  const result = await appDevOnce({
+    appPath: APP_PATH,
+    onProgress: (message: string) => console.log(`[dev] ${message}`),
+  });
+
+  if (!result.success) {
+    throw new Error(
+      `Dev sync failed: ${result.error?.message ?? 'Unknown error'}`,
+    );
+  }
+}
+
+export async function teardown() {
+  const uninstallResult = await appUninstall({ appPath: APP_PATH });
+
+  if (!uninstallResult.success) {
+    console.warn(
+      `App uninstall failed: ${uninstallResult.error?.message ?? 'Unknown error'}`,
+    );
+  }
+}
diff --git a/packages/twenty-apps/internal/twenty-slack/src/__tests__/twenty-slack.integration-test.ts b/packages/twenty-apps/internal/twenty-slack/src/__tests__/twenty-slack.integration-test.ts
new file mode 100644
index 0000000000..c9d3de3234
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/__tests__/twenty-slack.integration-test.ts
@@ -0,0 +1,25 @@
+import { MetadataApiClient } from 'twenty-client-sdk/metadata';
+import { describe, expect, it } from 'vitest';
+
+import { APPLICATION_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
+
+describe('App installation', () => {
+  it('should find the installed Slack app in the applications list', async () => {
+    const client = new MetadataApiClient();
+
+    const result = await client.query({
+      findManyApplications: {
+        id: true,
+        name: true,
+        universalIdentifier: true,
+      },
+    });
+
+    const matchingApplication = result.findManyApplications.find(
+      (application: { universalIdentifier: string }) =>
+        application.universalIdentifier === APPLICATION_UNIVERSAL_IDENTIFIER,
+    );
+
+    expect(matchingApplication).toBeDefined();
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/components/send-message-form.front-component.tsx b/packages/twenty-apps/internal/twenty-slack/src/components/send-message-form.front-component.tsx
index ba20b4eb83..5025cf9ac6 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/components/send-message-form.front-component.tsx
+++ b/packages/twenty-apps/internal/twenty-slack/src/components/send-message-form.front-component.tsx
@@ -1,20 +1,63 @@
-import {
-  useCallback,
-  useEffect,
-  useState,
-  type CSSProperties,
-  type SyntheticEvent,
-} from 'react';
+import { type CSSProperties, type SyntheticEvent, useCallback, useEffect, useState } from 'react';
 import { defineFrontComponent } from 'twenty-sdk/define';
-import {
-  closeSidePanel,
-  enqueueSnackbar,
-  unmountFrontComponent,
-} from 'twenty-sdk/front-component';
-import { themeCssVariables } from 'twenty-sdk/ui';
+import { closeSidePanel, enqueueSnackbar, unmountFrontComponent } from 'twenty-sdk/front-component';
 
 import { SEND_MESSAGE_FORM_FRONT_COMPONENT_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 
+// Workaround: 'twenty-sdk/ui' currently fails typecheck because it re-exports
+// from the unresolvable 'twenty-ui-deprecated'. Inline only the theme tokens
+// this component uses, keeping the same runtime CSS-variable values. Revert to
+// `import { themeCssVariables } from 'twenty-sdk/ui'` once the SDK export is fixed.
+const themeCssVariables = {
+  spacing: {
+    '1': 'var(--t-spacing-1)',
+    '2': 'var(--t-spacing-2)',
+    '3': 'var(--t-spacing-3)',
+    '4': 'var(--t-spacing-4)',
+    '8': 'var(--t-spacing-8)',
+    '20': 'var(--t-spacing-20)',
+  },
+  accent: {
+    accent4060: 'var(--t-accent-accent4060)',
+  },
+  background: {
+    primary: 'var(--t-background-primary)',
+    secondary: 'var(--t-background-secondary)',
+  },
+  border: {
+    color: {
+      medium: 'var(--t-border-color-medium)',
+      light: 'var(--t-border-color-light)',
+    },
+    radius: {
+      sm: 'var(--t-border-radius-sm)',
+    },
+  },
+  font: {
+    color: {
+      primary: 'var(--t-font-color-primary)',
+      secondary: 'var(--t-font-color-secondary)',
+      tertiary: 'var(--t-font-color-tertiary)',
+      inverted: 'var(--t-font-color-inverted)',
+      danger: 'var(--t-font-color-danger)',
+    },
+    size: {
+      xs: 'var(--t-font-size-xs)',
+      sm: 'var(--t-font-size-sm)',
+      md: 'var(--t-font-size-md)',
+    },
+    weight: {
+      regular: 'var(--t-font-weight-regular)',
+      medium: 'var(--t-font-weight-medium)',
+      semiBold: 'var(--t-font-weight-semi-bold)',
+    },
+    family: 'var(--t-font-family)',
+  },
+  color: {
+    blue: 'var(--t-color-blue)',
+  },
+};
+
 type SlackChannel = {
   id: string;
   name: string;
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-add-reaction-handler.test.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-add-reaction-handler.test.ts
new file mode 100644
index 0000000000..8b5dad135d
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-add-reaction-handler.test.ts
@@ -0,0 +1,79 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { slackAddReactionHandler } from 'src/logic-functions/handlers/slack-add-reaction-handler';
+
+const { getSlackClientMock, addReactionMock } = vi.hoisted(() => ({
+  getSlackClientMock: vi.fn(),
+  addReactionMock: vi.fn(),
+}));
+
+vi.mock('src/logic-functions/utils/get-slack-client', () => ({
+  getSlackClient: getSlackClientMock,
+}));
+
+const CHANNEL_ID = 'C0123456789';
+const MESSAGE_TS = '1700000000.000100';
+
+describe('slackAddReactionHandler', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    getSlackClientMock.mockResolvedValue({
+      success: true,
+      client: { reactions: { add: addReactionMock } },
+    });
+  });
+
+  it('should return a failure result and skip reacting when Slack is not connected', async () => {
+    getSlackClientMock.mockResolvedValue({
+      success: false,
+      error: 'Slack is not connected.',
+    });
+
+    const result = await slackAddReactionHandler({
+      slackChannelId: CHANNEL_ID,
+      messageTimestamp: MESSAGE_TS,
+      emojiName: 'thumbsup',
+    });
+
+    expect(result.success).toBe(false);
+    expect(addReactionMock).not.toHaveBeenCalled();
+  });
+
+  it('should add the reaction with a colon-stripped, trimmed emoji name', async () => {
+    addReactionMock.mockResolvedValue({ ok: true });
+
+    const result = await slackAddReactionHandler({
+      slackChannelId: CHANNEL_ID,
+      messageTimestamp: MESSAGE_TS,
+      emojiName: '  white_check_mark  ',
+    });
+
+    expect(addReactionMock).toHaveBeenCalledWith({
+      channel: CHANNEL_ID,
+      timestamp: MESSAGE_TS,
+      name: 'white_check_mark',
+    });
+    expect(result).toEqual({
+      success: true,
+      message: 'Reaction "white_check_mark" added to the message.',
+      slackTs: MESSAGE_TS,
+      channel: CHANNEL_ID,
+    });
+  });
+
+  it('should return a failure result when the Slack API throws', async () => {
+    addReactionMock.mockRejectedValue(new Error('already_reacted'));
+
+    const result = await slackAddReactionHandler({
+      slackChannelId: CHANNEL_ID,
+      messageTimestamp: MESSAGE_TS,
+      emojiName: 'eyes',
+    });
+
+    expect(result).toEqual({
+      success: false,
+      message: 'Failed to add Slack reaction',
+      error: 'already_reacted',
+    });
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-post-message-handler.test.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-post-message-handler.test.ts
new file mode 100644
index 0000000000..a89051b292
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/__tests__/slack-post-message-handler.test.ts
@@ -0,0 +1,125 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { slackPostMessageHandler } from 'src/logic-functions/handlers/slack-post-message-handler';
+
+const { getSlackClientMock, postMessageMock } = vi.hoisted(() => ({
+  getSlackClientMock: vi.fn(),
+  postMessageMock: vi.fn(),
+}));
+
+vi.mock('src/logic-functions/utils/get-slack-client', () => ({
+  getSlackClient: getSlackClientMock,
+}));
+
+const CHANNEL_ID = 'C0123456789';
+
+describe('slackPostMessageHandler', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    getSlackClientMock.mockResolvedValue({
+      success: true,
+      client: { chat: { postMessage: postMessageMock } },
+    });
+  });
+
+  it('should return a failure result and skip posting when Slack is not connected', async () => {
+    getSlackClientMock.mockResolvedValue({
+      success: false,
+      error: 'Slack is not connected.',
+    });
+
+    const result = await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'hello',
+    });
+
+    expect(result.success).toBe(false);
+    expect(result.error).toBe('Slack is not connected.');
+    expect(postMessageMock).not.toHaveBeenCalled();
+  });
+
+  it('should post the message and return the Slack timestamp and channel', async () => {
+    postMessageMock.mockResolvedValue({
+      ts: '1700000000.000100',
+      channel: CHANNEL_ID,
+    });
+
+    const result = await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'hello',
+      messageFormat: 'markdown',
+    });
+
+    expect(postMessageMock).toHaveBeenCalledWith({
+      channel: CHANNEL_ID,
+      thread_ts: undefined,
+      markdown_text: 'hello',
+    });
+    expect(result).toEqual({
+      success: true,
+      message: 'Message posted to Slack (ts=1700000000.000100).',
+      slackTs: '1700000000.000100',
+      channel: CHANNEL_ID,
+    });
+  });
+
+  it('should reply inside a thread with a trimmed parent timestamp', async () => {
+    postMessageMock.mockResolvedValue({
+      ts: '1700000000.000200',
+      channel: CHANNEL_ID,
+    });
+
+    await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'in thread',
+      parentMessageTimestamp: '  1699999999.000100  ',
+    });
+
+    expect(postMessageMock).toHaveBeenCalledWith(
+      expect.objectContaining({ thread_ts: '1699999999.000100' }),
+    );
+  });
+
+  it('should not set thread_ts when the parent timestamp is blank', async () => {
+    postMessageMock.mockResolvedValue({ ts: '1700000000.000300' });
+
+    await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'standalone',
+      parentMessageTimestamp: '   ',
+    });
+
+    expect(postMessageMock).toHaveBeenCalledWith(
+      expect.objectContaining({ thread_ts: undefined }),
+    );
+  });
+
+  it('should treat a runtime null parent timestamp as no thread without throwing', async () => {
+    postMessageMock.mockResolvedValue({ ts: '1700000000.000400' });
+
+    await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'standalone',
+      parentMessageTimestamp: null as unknown as undefined,
+    });
+
+    expect(postMessageMock).toHaveBeenCalledWith(
+      expect.objectContaining({ thread_ts: undefined }),
+    );
+  });
+
+  it('should return a failure result when the Slack API throws', async () => {
+    postMessageMock.mockRejectedValue(new Error('channel_not_found'));
+
+    const result = await slackPostMessageHandler({
+      slackChannelId: CHANNEL_ID,
+      messageText: 'hello',
+    });
+
+    expect(result).toEqual({
+      success: false,
+      message: 'Failed to post Slack message',
+      error: 'channel_not_found',
+    });
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-list-channels-handler.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-list-channels-handler.ts
index 6dd4b0f396..766bdf4e89 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-list-channels-handler.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-list-channels-handler.ts
@@ -1,12 +1,10 @@
-import { isDefined } from 'twenty-shared/utils';
-
 import {
   type SlackChannelType,
-  type SlackListChannelsInput,
+  type SlackListChannelsInput
 } from 'src/logic-functions/types/slack-list-channels-input.type';
 import {
   type SlackListChannelsResult,
-  type SlackListChannelsResultChannel,
+  type SlackListChannelsResultChannel
 } from 'src/logic-functions/types/slack-list-channels-result.type';
 import { getSlackClient } from 'src/logic-functions/utils/get-slack-client';
 
@@ -63,7 +61,7 @@ export const slackListChannelsHandler = async (
           break;
         }
 
-        if (!isDefined(channel.id) || !isDefined(channel.name)) {
+        if (channel.id == null || channel.name == null) {
           continue;
         }
 
@@ -81,7 +79,7 @@ export const slackListChannelsHandler = async (
 
       const nextCursor = response.response_metadata?.next_cursor;
 
-      if (!isDefined(nextCursor) || nextCursor.length === 0) {
+      if (nextCursor == null || nextCursor.length === 0) {
         break;
       }
 
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-post-message-handler.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-post-message-handler.ts
index c981ea67b7..9c6e1f5460 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-post-message-handler.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/handlers/slack-post-message-handler.ts
@@ -1,5 +1,3 @@
-import { isDefined } from 'twenty-shared/utils';
-
 import { type SlackPostMessageInput } from 'src/logic-functions/types/slack-post-message-input.type';
 import { type SlackToolResult } from 'src/logic-functions/types/slack-tool-result.type';
 import { getSlackChatMessageBodyFields } from 'src/logic-functions/utils/get-slack-chat-message-body-fields';
@@ -32,7 +30,7 @@ export const slackPostMessageHandler = async (
     const data = await client.chat.postMessage({
       channel: parameters.slackChannelId,
       thread_ts:
-        isDefined(parentTimestamp) && parentTimestamp.trim().length > 0
+        parentTimestamp != null && parentTimestamp.trim().length > 0
           ? parentTimestamp.trim()
           : undefined,
       ...bodyFields,
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-add-reaction.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-add-reaction.ts
index 7af2bafb57..a3e93db375 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-add-reaction.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-add-reaction.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_ADD_REACTION_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackAddReactionHandler } from 'src/logic-functions/handlers/slack-add-reaction-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackAddReactionInputSchema } from './schemas/slack-add-reaction-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-delete-message.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-delete-message.ts
index f69f830788..59a157ea17 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-delete-message.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-delete-message.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_DELETE_MESSAGE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackDeleteMessageHandler } from 'src/logic-functions/handlers/slack-delete-message-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackDeleteMessageInputSchema } from './schemas/slack-delete-message-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels-route.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels-route.ts
index 191432b562..d41039ea7b 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels-route.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels-route.ts
@@ -1,5 +1,4 @@
-import type { RoutePayload } from 'twenty-sdk/define';
-import { defineLogicFunction } from 'twenty-sdk/define';
+import { defineLogicFunction, type  RoutePayload } from 'twenty-sdk/define';
 
 import { SLACK_LIST_CHANNELS_ROUTE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackListChannelsHandler } from 'src/logic-functions/handlers/slack-list-channels-handler';
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels.ts
index b88711ef3e..528276db41 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-list-channels.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_LIST_CHANNELS_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackListChannelsHandler } from 'src/logic-functions/handlers/slack-list-channels-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackListChannelsInputSchema } from './schemas/slack-list-channels-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-ephemeral-message.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-ephemeral-message.ts
index 6ed951c1f6..c1e4d03c67 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-ephemeral-message.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-ephemeral-message.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_POST_EPHEMERAL_MESSAGE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackPostEphemeralMessageHandler } from 'src/logic-functions/handlers/slack-post-ephemeral-message-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackPostEphemeralMessageInputSchema } from './schemas/slack-post-ephemeral-message-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message-route.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message-route.ts
index 8bbe4408aa..5e9d509eda 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message-route.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message-route.ts
@@ -1,5 +1,4 @@
-import { defineLogicFunction } from 'twenty-sdk/define';
-import type { RoutePayload } from 'twenty-sdk/define';
+import { defineLogicFunction, type RoutePayload } from 'twenty-sdk/define';
 
 import { SLACK_POST_MESSAGE_ROUTE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackPostMessageHandler } from 'src/logic-functions/handlers/slack-post-message-handler';
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message.ts
index 5f2c8cdb60..9e47d09244 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-post-message.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_POST_MESSAGE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackPostMessageHandler } from 'src/logic-functions/handlers/slack-post-message-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackPostMessageInputSchema } from './schemas/slack-post-message-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-update-message.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-update-message.ts
index 100ab4064c..ef9d58899d 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-update-message.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/slack-update-message.ts
@@ -1,8 +1,8 @@
 import { defineLogicFunction } from 'twenty-sdk/define';
-import { jsonSchemaToInputSchema } from 'twenty-shared/logic-function';
 
 import { SLACK_UPDATE_MESSAGE_UNIVERSAL_IDENTIFIER } from 'src/constants/universal-identifiers';
 import { slackUpdateMessageHandler } from 'src/logic-functions/handlers/slack-update-message-handler';
+import { jsonSchemaToInputSchema } from 'src/logic-functions/utils/json-schema-to-input-schema';
 import { slackUpdateMessageInputSchema } from './schemas/slack-update-message-input.schema';
 
 export default defineLogicFunction({
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-chat-message-body-fields.test.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-chat-message-body-fields.test.ts
new file mode 100644
index 0000000000..b686903850
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-chat-message-body-fields.test.ts
@@ -0,0 +1,24 @@
+import { describe, expect, it } from 'vitest';
+
+import { getSlackChatMessageBodyFields } from 'src/logic-functions/utils/get-slack-chat-message-body-fields';
+
+describe('getSlackChatMessageBodyFields', () => {
+  it('should send markdown_text when the format is markdown', () => {
+    expect(getSlackChatMessageBodyFields('hello', 'markdown')).toEqual({
+      markdown_text: 'hello',
+    });
+  });
+
+  it('should send plain text with mrkdwn disabled when the format is plain', () => {
+    expect(getSlackChatMessageBodyFields('hello', 'plain')).toEqual({
+      text: 'hello',
+      mrkdwn: false,
+    });
+  });
+
+  it('should fall back to a plain text body when no format is provided', () => {
+    expect(getSlackChatMessageBodyFields('hello', undefined)).toEqual({
+      text: 'hello',
+    });
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-connection.test.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-connection.test.ts
new file mode 100644
index 0000000000..26ad343416
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/get-slack-connection.test.ts
@@ -0,0 +1,65 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { getSlackConnection } from 'src/logic-functions/utils/get-slack-connection';
+
+const { listConnectionsMock } = vi.hoisted(() => ({
+  listConnectionsMock: vi.fn(),
+}));
+
+vi.mock('twenty-sdk/logic-function', () => ({
+  listConnections: listConnectionsMock,
+}));
+
+describe('getSlackConnection', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should query connections for the slack provider', async () => {
+    listConnectionsMock.mockResolvedValue([
+      { visibility: 'workspace', accessToken: 'workspace-token' },
+    ]);
+
+    await getSlackConnection();
+
+    expect(listConnectionsMock).toHaveBeenCalledWith({ providerName: 'slack' });
+  });
+
+  it('should prefer a workspace-visibility connection over a personal one', async () => {
+    listConnectionsMock.mockResolvedValue([
+      { visibility: 'personal', accessToken: 'personal-token' },
+      { visibility: 'workspace', accessToken: 'workspace-token' },
+    ]);
+
+    const result = await getSlackConnection();
+
+    expect(result).toEqual({ success: true, accessToken: 'workspace-token' });
+  });
+
+  it('should fall back to the first connection when none are workspace-visible', async () => {
+    listConnectionsMock.mockResolvedValue([
+      { visibility: 'personal', accessToken: 'first-token' },
+      { visibility: 'personal', accessToken: 'second-token' },
+    ]);
+
+    const result = await getSlackConnection();
+
+    expect(result).toEqual({ success: true, accessToken: 'first-token' });
+  });
+
+  it('should fail when there is no Slack connection', async () => {
+    listConnectionsMock.mockResolvedValue([]);
+
+    const result = await getSlackConnection();
+
+    expect(result.success).toBe(false);
+  });
+
+  it('should fail gracefully when listing connections throws', async () => {
+    listConnectionsMock.mockRejectedValue(new Error('network down'));
+
+    const result = await getSlackConnection();
+
+    expect(result).toEqual({ success: false, error: 'network down' });
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/slack-tool-failure.test.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/slack-tool-failure.test.ts
new file mode 100644
index 0000000000..01f1f5edac
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/__tests__/slack-tool-failure.test.ts
@@ -0,0 +1,28 @@
+import { describe, expect, it } from 'vitest';
+
+import { slackToolFailure } from 'src/logic-functions/utils/slack-tool-failure';
+
+describe('slackToolFailure', () => {
+  it('should surface the underlying Error message', () => {
+    const result = slackToolFailure(
+      'Failed to post Slack message',
+      new Error('channel_not_found'),
+    );
+
+    expect(result).toEqual({
+      success: false,
+      message: 'Failed to post Slack message',
+      error: 'channel_not_found',
+    });
+  });
+
+  it('should use a generic error when the thrown value is not an Error', () => {
+    const result = slackToolFailure('Failed to post Slack message', 'boom');
+
+    expect(result).toEqual({
+      success: false,
+      message: 'Failed to post Slack message',
+      error: 'Slack request failed',
+    });
+  });
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/json-schema-to-input-schema.ts b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/json-schema-to-input-schema.ts
new file mode 100644
index 0000000000..d89e400dcb
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/src/logic-functions/utils/json-schema-to-input-schema.ts
@@ -0,0 +1,66 @@
+import { type InputJsonSchema } from 'twenty-sdk/logic-function';
+
+type InputSchemaProperty = {
+  type: 'string' | 'number' | 'boolean' | 'array' | 'object' | 'unknown';
+  enum?: string[];
+  items?: InputSchemaProperty;
+  properties?: Record<string, InputSchemaProperty>;
+  multiline?: boolean;
+  label?: string;
+};
+
+const convertProperty = (jsonSchema: InputJsonSchema): InputSchemaProperty => {
+  const property: InputSchemaProperty = { type: 'unknown' };
+
+  switch (jsonSchema.type) {
+    case 'string':
+      property.type = 'string';
+      break;
+    case 'number':
+    case 'integer':
+      property.type = 'number';
+      break;
+    case 'boolean':
+      property.type = 'boolean';
+      break;
+    case 'array':
+      property.type = 'array';
+      if (jsonSchema.items) {
+        property.items = convertProperty(jsonSchema.items);
+      }
+      break;
+    case 'object':
+      property.type = 'object';
+      if (jsonSchema.properties) {
+        property.properties = Object.fromEntries(
+          Object.entries(jsonSchema.properties).map(([key, value]) => [
+            key,
+            convertProperty(value),
+          ]),
+        );
+      }
+      break;
+    default:
+      property.type = 'unknown';
+  }
+
+  if (Array.isArray(jsonSchema.enum)) {
+    property.enum = jsonSchema.enum.filter(
+      (value): value is string => typeof value === 'string',
+    );
+  }
+
+  if (jsonSchema.multiline === true) {
+    property.multiline = true;
+  }
+
+  if (typeof jsonSchema.label === 'string' && jsonSchema.label.length > 0) {
+    property.label = jsonSchema.label;
+  }
+
+  return property;
+};
+
+export const jsonSchemaToInputSchema = (
+  jsonSchema: InputJsonSchema,
+): InputSchemaProperty[] => [convertProperty(jsonSchema)];
diff --git a/packages/twenty-apps/internal/twenty-slack/src/roles/default-function.role.ts b/packages/twenty-apps/internal/twenty-slack/src/roles/default-function.role.ts
index 92c75617c5..41aceaa47a 100644
--- a/packages/twenty-apps/internal/twenty-slack/src/roles/default-function.role.ts
+++ b/packages/twenty-apps/internal/twenty-slack/src/roles/default-function.role.ts
@@ -17,5 +17,5 @@ export default defineRole({
   canBeAssignedToApiKeys: false,
   objectPermissions: [],
   fieldPermissions: [],
-  permissionFlags: [],
+  permissionFlagUniversalIdentifiers: [],
 });
diff --git a/packages/twenty-apps/internal/twenty-slack/tsconfig.json b/packages/twenty-apps/internal/twenty-slack/tsconfig.json
index 80f5e7ceb0..abacf4dcf6 100644
--- a/packages/twenty-apps/internal/twenty-slack/tsconfig.json
+++ b/packages/twenty-apps/internal/twenty-slack/tsconfig.json
@@ -27,5 +27,16 @@
       "~/*": ["./*"]
     }
   },
-  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts"]
+  "exclude": [
+    "node_modules",
+    "dist",
+    "**/*.test.ts",
+    "**/*.spec.ts",
+    "**/*.integration-test.ts"
+  ],
+  "references": [
+    {
+      "path": "./tsconfig.spec.json"
+    }
+  ]
 }
diff --git a/packages/twenty-apps/internal/twenty-slack/tsconfig.spec.json b/packages/twenty-apps/internal/twenty-slack/tsconfig.spec.json
new file mode 100644
index 0000000000..ea69a6c010
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/tsconfig.spec.json
@@ -0,0 +1,9 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "composite": true,
+    "types": ["vitest/globals", "node"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/packages/twenty-apps/internal/twenty-slack/vitest.config.ts b/packages/twenty-apps/internal/twenty-slack/vitest.config.ts
index 6ec74eee27..055af77dbe 100644
--- a/packages/twenty-apps/internal/twenty-slack/vitest.config.ts
+++ b/packages/twenty-apps/internal/twenty-slack/vitest.config.ts
@@ -1,7 +1,31 @@
+import tsconfigPaths from 'vite-tsconfig-paths';
 import { defineConfig } from 'vitest/config';
 
+const TWENTY_API_URL = process.env.TWENTY_API_URL ?? 'http://localhost:2020';
+const TWENTY_API_KEY =
+  process.env.TWENTY_API_KEY ??
+  'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIyMDIwMjAyMC0xYzI1LTRkMDItYmYyNS02YWVjY2Y3ZWE0MTkiLCJ0eXBlIjoiQVBJX0tFWSIsIndvcmtzcGFjZUlkIjoiMjAyMDIwMjAtMWMyNS00ZDAyLWJmMjUtNmFlY2NmN2VhNDE5IiwiaWF0IjoxNzM1Njg5NjAwLCJleHAiOjQ4OTE0NDk2MDAsImp0aSI6IjIwMjAyMDIwLWY0MDEtNGQ4YS1hNzMxLTY0ZDAwN2MyN2JhZCJ9.bfQjfyN0NEtTCLE_xPyNcwonDzlSXFoP8kdCQTdnuDc';
+
+// Make env vars available to globalSetup (test.env only applies to workers)
+process.env.TWENTY_API_URL = TWENTY_API_URL;
+process.env.TWENTY_API_KEY = TWENTY_API_KEY;
+
 export default defineConfig({
+  plugins: [
+    tsconfigPaths({
+      projects: ['tsconfig.spec.json'],
+      ignoreConfigErrors: true,
+    }),
+  ],
   test: {
-    include: ['src/**/*.test.ts'],
+    testTimeout: 120_000,
+    hookTimeout: 120_000,
+    fileParallelism: false,
+    include: ['src/**/*.integration-test.ts'],
+    globalSetup: ['src/__tests__/global-setup.ts'],
+    env: {
+      TWENTY_API_URL,
+      TWENTY_API_KEY,
+    },
   },
 });
diff --git a/packages/twenty-apps/internal/twenty-slack/vitest.unit.config.ts b/packages/twenty-apps/internal/twenty-slack/vitest.unit.config.ts
new file mode 100644
index 0000000000..e0d140015b
--- /dev/null
+++ b/packages/twenty-apps/internal/twenty-slack/vitest.unit.config.ts
@@ -0,0 +1,14 @@
+import tsconfigPaths from 'vite-tsconfig-paths';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  plugins: [
+    tsconfigPaths({
+      projects: ['tsconfig.spec.json'],
+      ignoreConfigErrors: true,
+    }),
+  ],
+  test: {
+    include: ['src/**/*.test.ts'],
+  },
+});
diff --git a/packages/twenty-apps/internal/twenty-slack/yarn.lock b/packages/twenty-apps/internal/twenty-slack/yarn.lock
index ca9afe0a56..766426f13a 100644
--- a/packages/twenty-apps/internal/twenty-slack/yarn.lock
+++ b/packages/twenty-apps/internal/twenty-slack/yarn.lock
@@ -834,6 +834,87 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@typescript/native-preview-darwin-arm64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-darwin-arm64@npm:7.0.0-dev.20260616.1"
+  conditions: os=darwin & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-darwin-x64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-darwin-x64@npm:7.0.0-dev.20260616.1"
+  conditions: os=darwin & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-linux-arm64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-linux-arm64@npm:7.0.0-dev.20260616.1"
+  conditions: os=linux & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-linux-arm@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-linux-arm@npm:7.0.0-dev.20260616.1"
+  conditions: os=linux & cpu=arm
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-linux-x64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-linux-x64@npm:7.0.0-dev.20260616.1"
+  conditions: os=linux & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-win32-arm64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-win32-arm64@npm:7.0.0-dev.20260616.1"
+  conditions: os=win32 & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview-win32-x64@npm:7.0.0-dev.20260616.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview-win32-x64@npm:7.0.0-dev.20260616.1"
+  conditions: os=win32 & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@typescript/native-preview@npm:^7.0.0-dev.20260116.1":
+  version: 7.0.0-dev.20260616.1
+  resolution: "@typescript/native-preview@npm:7.0.0-dev.20260616.1"
+  dependencies:
+    "@typescript/native-preview-darwin-arm64": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-darwin-x64": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-linux-arm": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-linux-arm64": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-linux-x64": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-win32-arm64": "npm:7.0.0-dev.20260616.1"
+    "@typescript/native-preview-win32-x64": "npm:7.0.0-dev.20260616.1"
+  dependenciesMeta:
+    "@typescript/native-preview-darwin-arm64":
+      optional: true
+    "@typescript/native-preview-darwin-x64":
+      optional: true
+    "@typescript/native-preview-linux-arm":
+      optional: true
+    "@typescript/native-preview-linux-arm64":
+      optional: true
+    "@typescript/native-preview-linux-x64":
+      optional: true
+    "@typescript/native-preview-win32-arm64":
+      optional: true
+    "@typescript/native-preview-win32-x64":
+      optional: true
+  bin:
+    tsgo: bin/tsgo.js
+  checksum: 10c0/e858f6a5bc41e615d3a87381ac33c938cbaa3553c47f4f1c3e06682fd96303f624ecd457542b7980a7eb29f73b54da19e8a52650246cc98a145c4a46aa743b40
+  languageName: node
+  linkType: hard
+
 "@vitest/expect@npm:4.1.8":
   version: 4.1.8
   resolution: "@vitest/expect@npm:4.1.8"
@@ -1142,7 +1223,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"debug@npm:4":
+"debug@npm:4, debug@npm:^4.1.1":
   version: 4.4.3
   resolution: "debug@npm:4.4.3"
   dependencies:
@@ -1525,6 +1606,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"globrex@npm:^0.1.2":
+  version: 0.1.2
+  resolution: "globrex@npm:0.1.2"
+  checksum: 10c0/a54c029520cf58bda1d8884f72bd49b4cd74e977883268d931fd83bcbd1a9eb96d57c7dbd4ad80148fb9247467ebfb9b215630b2ed7563b2a8de02e1ff7f89d1
+  languageName: node
+  linkType: hard
+
 "gopd@npm:^1.2.0":
   version: 1.2.0
   resolution: "gopd@npm:1.2.0"
@@ -2530,6 +2618,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tsconfck@npm:^3.0.3":
+  version: 3.1.6
+  resolution: "tsconfck@npm:3.1.6"
+  peerDependencies:
+    typescript: ^5.0.0
+  peerDependenciesMeta:
+    typescript:
+      optional: true
+  bin:
+    tsconfck: bin/tsconfck.js
+  checksum: 10c0/269c3c513540be44844117bb9b9258fe6f8aeab026d32aeebf458d5299125f330711429dbb556dbf125a0bc25f4a81e6c24ac96de2740badd295c3fb400f66c4
+  languageName: node
+  linkType: hard
+
 "tslib@npm:^1.9.3":
   version: 1.14.1
   resolution: "tslib@npm:1.14.1"
@@ -2544,22 +2646,22 @@ __metadata:
   languageName: node
   linkType: hard
 
-"twenty-client-sdk@npm:2.13.0":
-  version: 2.13.0
-  resolution: "twenty-client-sdk@npm:2.13.0"
+"twenty-client-sdk@npm:2.14.0, twenty-client-sdk@npm:^2.14.0":
+  version: 2.14.0
+  resolution: "twenty-client-sdk@npm:2.14.0"
   dependencies:
     "@genql/runtime": "npm:^2.10.0"
     esbuild: "npm:^0.28.1"
     graphql: "npm:^16.8.1"
     lodash: "npm:^4.17.21"
     prettier: "npm:^3.8.3"
-  checksum: 10c0/740464acec94c1d4cc5fa50ed6b190a7f1d1681963f61437a6c704835c05ffe0f5a13e254e57601a99b07bbe0f68483dee19211731853aafbcc15ec79f8039ce
+  checksum: 10c0/eb222a726e21fc98f3a624f9acac7d47f0c769b989911889036665dac7c7c88698ec99beb844bf51a42e1696ea0a067bae8cf47fd751965af52a3720835242f0
   languageName: node
   linkType: hard
 
-"twenty-sdk@npm:2.13.0":
-  version: 2.13.0
-  resolution: "twenty-sdk@npm:2.13.0"
+"twenty-sdk@npm:^2.14.0":
+  version: 2.14.0
+  resolution: "twenty-sdk@npm:2.14.0"
   dependencies:
     "@sniptt/guards": "npm:^0.2.0"
     axios: "npm:^1.16.0"
@@ -2576,12 +2678,12 @@ __metadata:
     react: "npm:^19.2.0"
     react-dom: "npm:^19.2.0"
     tinyglobby: "npm:^0.2.15"
-    twenty-client-sdk: "npm:2.13.0"
+    twenty-client-sdk: "npm:2.14.0"
     typescript: "npm:^5.9.3"
     uuid: "npm:^13.0.2"
   bin:
     twenty: dist/cli.cjs
-  checksum: 10c0/51c350abe5d344fcad3c961a77632fd3cb2d91e357d0562b3eb02f05f66dbc41221c5463d0f91c022316a16af03a05ad43f038d9534c0ae31c060008d0e48672
+  checksum: 10c0/c4211772f8dd2ba81074a74be5f616c4c264d6bf8a174c5724be6d1c9a8cb3ca68a2674653bb58c059dae4bf1b0f43f91991e73d6a01395807206f0ac44afb08
   languageName: node
   linkType: hard
 
@@ -2592,11 +2694,14 @@ __metadata:
     "@slack/web-api": "npm:^7.8.0"
     "@types/node": "npm:^24.7.2"
     "@types/react": "npm:^18.2.0"
+    "@typescript/native-preview": "npm:^7.0.0-dev.20260116.1"
     oxlint: "npm:^0.16.0"
     react: "npm:^18.2.0"
     react-dom: "npm:^18.2.0"
-    twenty-sdk: "npm:2.13.0"
+    twenty-client-sdk: "npm:^2.14.0"
+    twenty-sdk: "npm:^2.14.0"
     typescript: "npm:^5.9.3"
+    vite-tsconfig-paths: "npm:^4.2.1"
     vitest: "npm:^4.0.0"
   languageName: unknown
   linkType: soft
@@ -2674,6 +2779,22 @@ __metadata:
   languageName: node
   linkType: hard
 
+"vite-tsconfig-paths@npm:^4.2.1":
+  version: 4.3.2
+  resolution: "vite-tsconfig-paths@npm:4.3.2"
+  dependencies:
+    debug: "npm:^4.1.1"
+    globrex: "npm:^0.1.2"
+    tsconfck: "npm:^3.0.3"
+  peerDependencies:
+    vite: "*"
+  peerDependenciesMeta:
+    vite:
+      optional: true
+  checksum: 10c0/f390ac1d1c3992fc5ac50f9274c1090f8b55ab34a89ea88893db9a6924a3b26c9f64bc1163615150ad100749db73b6b2cf1d57f6cd60df6e762ceb5b8ad30024
+  languageName: node
+  linkType: hard
+
 "vite@npm:^6.0.0 || ^7.0.0 || ^8.0.0":
   version: 8.0.16
   resolution: "vite@npm:8.0.16"
diff --git a/packages/twenty-docs/developers/extend/apps/logic/logic-functions.mdx b/packages/twenty-docs/developers/extend/apps/logic/logic-functions.mdx
index 1129ff82e8..a5de428fd9 100644
--- a/packages/twenty-docs/developers/extend/apps/logic/logic-functions.mdx
+++ b/packages/twenty-docs/developers/extend/apps/logic/logic-functions.mdx
@@ -349,6 +349,32 @@ export default defineLogicFunction({
 });
 ```
 
+To declare your parameters **once** and serve both surfaces, define a single JSON Schema (`InputJsonSchema`) and convert it for the workflow action with `jsonSchemaToInputSchema` from `twenty-sdk/logic-function`. `toolTriggerSettings.inputSchema` takes the JSON Schema directly, while `workflowActionTriggerSettings.inputSchema` expects Twenty's `InputSchema`:
+
+```ts
+import { defineLogicFunction } from 'twenty-sdk/define';
+import { jsonSchemaToInputSchema, type InputJsonSchema } from 'twenty-sdk/logic-function';
+
+const inputSchema: InputJsonSchema = {
+  type: 'object',
+  properties: {
+    companyName: { type: 'string', label: 'Company name' },
+    domain: { type: 'string', label: 'Domain' },
+  },
+  required: ['companyName'],
+};
+
+export default defineLogicFunction({
+  ...,
+  toolTriggerSettings: { inputSchema },
+  workflowActionTriggerSettings: {
+    label: 'Enrich Company',
+    icon: 'IconBuilding',
+    inputSchema: jsonSchemaToInputSchema(inputSchema),
+  },
+});
+```
+
 <Note>
 **Write a good `description`.** AI agents rely on the function's `description` field to decide when to use the tool. Be specific about what the tool does and when it should be called.
 </Note>
@@ -356,6 +382,20 @@ export default defineLogicFunction({
 </Accordion>
 </AccordionGroup>
 
+<Note>
+**Runtime helpers.** `twenty-sdk/utils` re-exports small runtime helpers so handlers never import from `twenty-shared` directly. For example, `isDefined(value)` returns `false` for both `null` and `undefined` — use it to safely narrow optional handler inputs, which can arrive as `null` at runtime even when typed `T | undefined`:
+
+```ts
+import { isDefined } from 'twenty-sdk/utils';
+
+const handler = async (params: { parentMessageId?: string }) => {
+  if (isDefined(params.parentMessageId)) {
+    // params.parentMessageId is narrowed to string here
+  }
+};
+```
+</Note>
+
 <Note>
 **Install hooks** — pre-install and post-install handlers — share this runtime but are declared with their own define functions and don't take trigger settings. See [Install Hooks](/developers/extend/apps/config/install-hooks) for `definePreInstallLogicFunction` and `definePostInstallLogicFunction`.
 </Note>
diff --git a/packages/twenty-sdk/src/sdk/logic-function/index.ts b/packages/twenty-sdk/src/sdk/logic-function/index.ts
index b29b72288f..9a733980f3 100644
--- a/packages/twenty-sdk/src/sdk/logic-function/index.ts
+++ b/packages/twenty-sdk/src/sdk/logic-function/index.ts
@@ -36,7 +36,10 @@ export type {
 
 export type { RoutePayload } from '@/sdk/define/logic-functions/triggers/route-payload-type';
 
-export type { InputJsonSchema } from 'twenty-shared/logic-function';
+export {
+  jsonSchemaToInputSchema,
+  type InputJsonSchema,
+} from 'twenty-shared/logic-function';
 
 export { getConnection } from '@/sdk/logic-function/connections/get-connection';
 export { listConnections } from '@/sdk/logic-function/connections/list-connections';
diff --git a/packages/twenty-sdk/src/sdk/utils/index.ts b/packages/twenty-sdk/src/sdk/utils/index.ts
index 0b771dc49e..539fee9530 100644
--- a/packages/twenty-sdk/src/sdk/utils/index.ts
+++ b/packages/twenty-sdk/src/sdk/utils/index.ts
@@ -1 +1,2 @@
 export { getPublicAssetUrl } from '@/sdk/utils/get-public-asset-url';
+export { isDefined } from 'twenty-shared/utils';