Imported from tunacosgun/sim (.agents/skills/add-integration/SKILL.md). Install upstream with npx skills add tunacosgun/sim --skill add-integration. Copyright stays with the author.

Add Integration Skill

You are an expert at adding complete integrations to Sim. This skill orchestrates the full process of adding a new service integration.

Overview

Adding an integration involves these steps in order:

1. Research - Read the service's API documentation
2. Create Tools - Build tool configurations for each API operation
3. Create Block - Build the block UI configuration
4. Add Icon - Add the service's brand icon
5. Create Triggers (optional) - If the service supports webhooks
6. Register - Register tools, block, and triggers in their registries
7. Generate Docs - Run the docs generation script

Step 1: Research the API

Before writing any code:

1. Use Context7 to find official documentation: mcp__plugin_context7_context7__resolve-library-id
2. Or use WebFetch to read API docs directly
3. Identify:
   • Authentication method (OAuth, API Key, both)
   • Available operations (CRUD, search, etc.)
   • Required vs optional parameters
   • Response structures

Hard Rule: No Guessed Response Schemas

If the official docs do not clearly show the response JSON shape for an endpoint, you MUST stop and tell the user exactly which outputs are unknown.

• Do NOT guess response field names
• Do NOT infer nested JSON paths from related endpoints
• Do NOT invent output properties just because they seem likely
• Do NOT implement transformResponse against unverified payload shapes

If response schemas are missing or incomplete, do one of the following before proceeding:

1. Ask the user for sample responses
2. Ask the user for test credentials so you can verify the live payload
3. Reduce the scope to only endpoints whose response shapes are documented
4. Leave the tool unimplemented and explicitly report why

Step 2: Create Tools

Directory Structure

apps/sim/tools/{service}/
├── index.ts          # Barrel exports
├── types.ts          # TypeScript interfaces
├── {action1}.ts      # Tool for action 1
├── {action2}.ts      # Tool for action 2
└── ...

Key Patterns

types.ts:

import type { ToolResponse } from '@/tools/types'

export interface {Service}{Action}Params {
  accessToken: string      // For OAuth services
  // OR
  apiKey: string          // For API key services

  requiredParam: string
  optionalParam?: string
}

export interface {Service}Response extends ToolResponse {
  output: {
    // Define output structure
  }
}

Tool file pattern:

export const {service}{Action}Tool: ToolConfig<Params, Response> = {
  id: '{service}_{action}',
  name: '{Service} {Action}',
  description: '...',
  version: '1.0.0',

  oauth: { required: true, provider: '{service}' },  // If OAuth

  params: {
    accessToken: { type: 'string', required: true, visibility: 'hidden', description: '...' },
    // ... other params
  },

  request: { url, method, headers, body },

  transformResponse: async (response) => {
    const data = await response.json()
    return {
      success: true,
      output: {
        field: data.field ?? null,  // Always handle nullables
      },
    }
  },

  outputs: { /* ... */ },
}

Critical Rules

• visibility: 'hidden' for OAuth tokens
• visibility: 'user-only' for API keys and user credentials
• visibility: 'user-or-llm' for operation parameters
• Always use ?? null for nullable API response fields
• Always use ?? [] for optional array fields
• Set optional: true for outputs that may not exist
• Never output raw JSON dumps - extract meaningful fields
• When using type: 'json' and you know the object shape, define properties with the inner fields so downstream consumers know the structure. Only use bare type: 'json' when the shape is truly dynamic
• If you do not know the response JSON shape from docs or verified examples, you MUST tell the user and stop. Never guess outputs or response mappings.

Step 3: Create Block

File Location

apps/sim/blocks/blocks/{service}.ts

Block Structure

import { {Service}Icon } from '@/components/icons'
import type { BlockConfig } from '@/blocks/types'
import { AuthMode } from '@/blocks/types'
import { getScopesForService } from '@/lib/oauth/utils'

export const {Service}Block: BlockConfig = {
  type: '{service}',
  name: '{Service}',
  description: '...',
  longDescription: '...',
  docsLink: 'https://github.com/tunacosgun/sim/tools/{service}',
  category: 'tools',
  bgColor: '#HEXCOLOR',
  icon: {Service}Icon,
  authMode: AuthMode.OAuth,  // or AuthMode.ApiKey

  subBlocks: [
    // Operation dropdown
    {
      id: 'operation',
      title: 'Operation',
      type: 'dropdown',
      options: [
        { label: 'Operation 1', id: 'action1' },
        { label: 'Operation 2', id: 'action2' },
      ],
      value: () => 'action1',
    },
    // Credential field
    {
      id: 'credential',
      title: '{Service} Account',
      type: 'oauth-input',
      serviceId: '{service}',
      requiredScopes: getScopesForService('{service}'),
      required: true,
    },
    // Conditional fields per operation
    // ...
  ],

  tools: {
    access: ['{service}_action1', '{service}_action2'],
    config: {
      tool: (params) => `{service}_${params.operation}`,
    },
  },

  outputs: { /* ... */ },
}

Key SubBlock Patterns

Condition-based visibility:

{
  id: 'resourceId',
  title: 'Resource ID',
  type: 'short-input',
  condition: { field: 'operation', value: ['read', 'update', 'delete'] },
  required: { field: 'operation', value: ['read', 'update', 'delete'] },
}

DependsOn for cascading selectors:

{
  id: 'project',
  type: 'project-selector',
  dependsOn: ['credential'],
},
{
  id: 'issue',
  type: 'file-selector',
  dependsOn: ['credential', 'project'],
}

Basic/Advanced mode for dual UX:

// Basic: Visual selector
{
  id: 'channel',
  type: 'channel-selector',
  mode: 'basic',
  canonicalParamId: 'channel',
  dependsOn: ['credential'],
},
// Advanced: Manual input
{
  id: 'channelId',
  type: 'short-input',
  mode: 'advanced',
  canonicalParamId: 'channel',
}

Critical Canonical Param Rules:

• canonicalParamId must NOT match any subblock's id in the block
• canonicalParamId must be unique per operation/condition context
• Only use canonicalParamId to link basic/advanced alternatives for the same logical parameter
• mode only controls UI visibility, NOT serialization. Without canonicalParamId, both basic and advanced field values would be sent
• Every subblock id must be unique within the block. Duplicate IDs cause conflicts even with different conditions
• Required consistency: If one subblock in a canonical group has required: true, ALL subblocks in that group must have required: true (prevents bypassing validation by switching modes)
• Inputs section: Must list canonical param IDs (e.g., fileId), NOT raw subblock IDs (e.g., fileSelector, manualFileId)
• Params function: Must use canonical param IDs, NOT raw subblock IDs (raw IDs are deleted after canonical transformation)

Step 4: Add Icon

File Location

apps/sim/components/icons.tsx

Pattern

export function {Service}Icon(props: SVGProps<SVGSVGElement>) {
  return (
    <svg
      {...props}
      viewBox="0 0 24 24"
      fill="none"
      xmlns="http://www.w3.org/2000/svg"
    >
      {/* SVG paths from user-provided SVG */}
    </svg>
  )
}

Getting Icons

Do NOT search for icons yourself. At the end of implementation, ask the user to provide the SVG:

I've completed the integration. Before I can add the icon, please provide the SVG for {Service}.
You can usually find this in the service's brand/press kit page, or copy it from their website.

Paste the SVG code here and I'll convert it to a React component.

Once the user provides the SVG:

1. Extract the SVG paths/content
2. Create a React component that spreads props
3. Ensure viewBox is preserved from the original SVG

Step 5: Create Triggers (Optional)

If the service supports webhooks, create triggers using the generic buildTriggerSubBlocks helper.

Directory Structure

apps/sim/triggers/{service}/
├── index.ts      # Barrel exports
├── utils.ts      # Trigger options, setup instructions, extra fields
├── {event_a}.ts  # Primary trigger (includes dropdown)
├── {event_b}.ts  # Secondary triggers (no dropdown)
└── webhook.ts    # Generic webhook (optional)

Key Pattern

import { buildTriggerSubBlocks } from '@/triggers'
import { {service}TriggerOptions, {service}SetupInstructions, build{Service}ExtraFields } from './utils'

// Primary trigger - includeDropdown: true
export const {service}EventATrigger: TriggerConfig = {
  id: '{service}_event_a',
  subBlocks: buildTriggerSubBlocks({
    triggerId: '{service}_event_a',
    triggerOptions: {service}TriggerOptions,
    includeDropdown: true,  // Only for primary trigger!
    setupInstructions: {service}SetupInstructions('Event A'),
    extraFields: build{Service}ExtraFields('{service}_event_a'),
  }),
  // ...
}

// Secondary triggers - no dropdown
export const {service}EventBTrigger: TriggerConfig = {
  id: '{service}_event_b',
  subBlocks: buildTriggerSubBlocks({
    triggerId: '{service}_event_b',
    triggerOptions: {service}TriggerOptions,
    // No includeDropdown!
    setupInstructions: {service}SetupInstructions('Event B'),
    extraFields: build{Service}ExtraFields('{service}_event_b'),
  }),
  // ...
}

Connect to Block

import { getTrigger } from '@/triggers'

export const {Service}Block: BlockConfig = {
  triggers: {
    enabled: true,
    available: ['{service}_event_a', '{service}_event_b'],
  },
  subBlocks: [
    // Tool fields...
    ...getTrigger('{service}_event_a').subBlocks,
    ...getTrigger('{service}_event_b').subBlocks,
  ],
}

See /add-trigger skill for complete documentation.

Step 6: Register Everything

Tools Registry (apps/sim/tools/registry.ts)

// Add import (alphabetically)
import {
  {service}Action1Tool,
  {service}Action2Tool,
} from '@/tools/{service}'

// Add to tools object (alphabetically)
export const tools: Record<string, ToolConfig> = {
  // ... existing tools ...
  {service}_action1: {service}Action1Tool,
  {service}_action2: {service}Action2Tool,
}

Block Registry (apps/sim/blocks/registry.ts)

// Add import (alphabetically)
import { {Service}Block } from '@/blocks/blocks/{service}'

// Add to registry (alphabetically)
export const registry: Record<string, BlockConfig> = {
  // ... existing blocks ...
  {service}: {Service}Block,
}

Trigger Registry (apps/sim/triggers/registry.ts) - If triggers exist

// Add import (alphabetically)
import {
  {service}EventATrigger,
  {service}EventBTrigger,
  {service}WebhookTrigger,
} from '@/triggers/{service}'

// Add to TRIGGER_REGISTRY (alphabetically)
export const TRIGGER_REGISTRY: TriggerRegistry = {
  // ... existing triggers ...
  {service}_event_a: {service}EventATrigger,
  {service}_event_b: {service}EventBTrigger,
  {service}_webhook: {service}WebhookTrigger,
}

Step 7: Generate Docs

Run the documentation generator:

bun run scripts/generate-docs.ts

This creates apps/docs/content/docs/en/tools/{service}.mdx

V2 Integration Pattern

If creating V2 versions (API-aligned outputs):

1. V2 Tools - Add _v2 suffix, version 2.0.0, flat outputs
2. V2 Block - Add _v2 type, use createVersionedToolSelector
3. V1 Block - Add (Legacy) to name, set hideFromToolbar: true
4. Registry - Register both versions

// In registry
{service}: {Service}Block,        // V1 (legacy, hidden)
{service}_v2: {Service}V2Block,   // V2 (visible)

Complete Checklist

Tools

• Created tools/{service}/ directory
• Created types.ts with all interfaces
• Created tool file for each operation
• All params have correct visibility
• All nullable fields use ?? null
• All optional outputs have optional: true
• Created index.ts barrel export
• Registered all tools in tools/registry.ts

Block

• Created blocks/blocks/{service}.ts
• Defined operation dropdown with all operations
• Added credential field with requiredScopes: getScopesForService('{service}')
• Added conditional fields per operation
• Set up dependsOn for cascading selectors
• Configured tools.access with all tool IDs
• Configured tools.config.tool selector
• Defined outputs matching tool outputs
• Registered block in blocks/registry.ts
• If triggers: set triggers.enabled and triggers.available
• If triggers: spread trigger subBlocks with getTrigger()

OAuth Scopes (if OAuth service)

• Defined scopes in lib/oauth/oauth.ts under OAUTH_PROVIDERS
• Added scope descriptions in SCOPE_DESCRIPTIONS within lib/oauth/utils.ts
• Used getCanonicalScopesForProvider() in auth.ts (never hardcode)
• Used getScopesForService() in block requiredScopes (never hardcode)

Icon

• Asked user to provide SVG
• Added icon to components/icons.tsx
• Icon spreads props correctly

Triggers (if service supports webhooks)

• Created triggers/{service}/ directory
• Created utils.ts with options, instructions, and extra fields helpers
• Primary trigger uses includeDropdown: true
• Secondary triggers do NOT have includeDropdown
• All triggers use buildTriggerSubBlocks helper
• Created index.ts barrel export
• Registered all triggers in triggers/registry.ts

Docs

• Ran bun run scripts/generate-docs.ts
• Verified docs file created

Final Validation (Required)

• Read every tool file and cross-referenced inputs/outputs against the API docs
• Verified block subBlocks cover all required tool params with correct conditions
• Verified block outputs match what the tools actually return
• Verified tools.config.params correctly maps and coerces all param types
• Verified every tool output and transformResponse path against documented or live-verified JSON responses
• If any response schema remained unknown, explicitly told the user instead of guessing

Example Command

When the user asks to add an integration:

User: Add a Stripe integration

You: I'll add the Stripe integration. Let me:

1. First, research the Stripe API using Context7
2. Create the tools for key operations (payments, subscriptions, etc.)
3. Create the block with operation dropdown
4. Register everything
5. Generate docs
6. Ask you for the Stripe icon SVG

[Proceed with implementation...]

[After completing steps 1-5...]

I've completed the Stripe integration. Before I can add the icon, please provide the SVG for Stripe.
You can usually find this in the service's brand/press kit page, or copy it from their website.

Paste the SVG code here and I'll convert it to a React component.

File Handling

When your integration handles file uploads or downloads, follow these patterns to work with UserFile objects consistently.

What is a UserFile?

A UserFile is the standard file representation in Sim:

interface UserFile {
  id: string       // Unique identifier
  name: string     // Original filename
  url: string      // Presigned URL for download
  size: number     // File size in bytes
  type: string     // MIME type (e.g., 'application/pdf')
  base64?: string  // Optional base64 content (if small file)
  key?: string     // Internal storage key
  context?: object // Storage context metadata
}

File Input Pattern (Uploads)

For tools that accept file uploads, always route through an internal API endpoint rather than calling external APIs directly. This ensures proper file content retrieval.

1. Block SubBlocks for File Input

Use the basic/advanced mode pattern:

// Basic mode: File upload UI
{
  id: 'uploadFile',
  title: 'File',
  type: 'file-upload',
  canonicalParamId: 'file',  // Maps to 'file' param
  placeholder: 'Upload file',
  mode: 'basic',
  multiple: false,
  required: true,
  condition: { field: 'operation', value: 'upload' },
},
// Advanced mode: Reference from previous block
{
  id: 'fileRef',
  title: 'File',
  type: 'short-input',
  canonicalParamId: 'file',  // Same canonical param
  placeholder: 'Reference file (e.g., {{file_block.output}})',
  mode: 'advanced',
  required: true,
  condition: { field: 'operation', value: 'upload' },
},

Critical: canonicalParamId must NOT match any subblock id.

2. Normalize File Input in Block Config

In tools.config.tool, use normalizeFileInput to handle all input variants:

import { normalizeFileInput } from '@/blocks/utils'

tools: {
  config: {
    tool: (params) => {
      // Normalize file from basic (uploadFile), advanced (fileRef), or legacy (fileContent)
      const normalizedFile = normalizeFileInput(
        params.uploadFile || params.fileRef || params.fileContent,
        { single: true }
      )
      if (normalizedFile) {
        params.file = normalizedFile
      }
      return `{service}_${params.operation}`
    },
  },
}

3. Create Internal API Route

Create apps/sim/app/api/tools/{service}/{action}/route.ts:

import { createLogger } from '@sim/logger'
import { NextResponse, type NextRequest } from 'next/server'
import { z } from 'zod'
import { checkInternalAuth } from '@/lib/auth/hybrid'
import { generateRequestId } from '@/lib/core/utils/request'
import { FileInputSchema, type RawFileInput } from '@/lib/uploads/utils/file-schemas'
import { processFilesToUserFiles } from '@/lib/uploads/utils/file-utils'
import { downloadFileFromStorage } from '@/lib/uploads/utils/file-utils.server'

const logger = createLogger('{Service}UploadAPI')

const RequestSchema = z.object({
  accessToken: z.string(),
  file: FileInputSchema.optional().nullable(),
  // Legacy field for backwards compatibility
  fileContent: z.string().optional().nullable(),
  // ... other params
})

export async function POST(request: NextRequest) {
  const requestId = generateRequestId()

  const authResult = await checkInternalAuth(request, { requireWorkflowId: false })
  if (!authResult.success) {
    return NextResponse.json({ success: false, error: 'Unauthorized' }, { status: 401 })
  }

  const body = await request.json()
  const data = RequestSchema.parse(body)

  let fileBuffer: Buffer
  let fileName: string

  // Prefer UserFile input, fall back to legacy base64
  if (data.file) {
    const userFiles = processFilesToUserFiles([data.file as RawFileInput], requestId, logger)
    if (userFiles.length === 0) {
      return NextResponse.json({ success: false, error: 'Invalid file' }, { status: 400 })
    }
    const userFile = userFiles[0]
    fileBuffer = await downloadFileFromStorage(userFile, requestId, logger)
    fileName = userFile.name
  } else if (data.fileContent) {
    // Legacy: base64 string (backwards compatibility)
    fileBuffer = Buffer.from(data.fileContent, 'base64')
    fileName = 'file'
  } else {
    return NextResponse.json({ success: false, error: 'File required' }, { status: 400 })
  }

  // Now call external API with fileBuffer
  const response = await fetch('https://api.{service}.com/upload', {
    method: 'POST',
    headers: { Authorization: `Bearer ${data.accessToken}` },
    body: new Uint8Array(fileBuffer),  // Convert Buffer for fetch
  })

  // ... handle response
}

4. Update Tool to Use Internal Route

export const {service}UploadTool: ToolConfig<Params, Response> = {
  id: '{service}_upload',
  // ...
  params: {
    file: { type: 'file', required: false, visibility: 'user-or-llm' },
    fileContent: { type: 'string', required: false, visibility: 'hidden' }, // Legacy
  },
  request: {
    url: '/api/tools/{service}/upload',  // Internal route
    method: 'POST',
    body: (params) => ({
      accessToken: params.accessToken,
      file: params.file,
      fileContent: params.fileContent,
    }),
  },
}

File Output Pattern (Downloads)

For tools that return files, use FileToolProcessor to store files and return UserFile objects.

In Tool transformResponse

import { FileToolProcessor } from '@/executor/utils/file-tool-processor'

transformResponse: async (response, context) => {
  const data = await response.json()

  // Process file outputs to UserFile objects
  const fileProcessor = new FileToolProcessor(context)
  const file = await fileProcessor.processFileData({
    data: data.content,      // base64 or buffer
    mimeType: data.mimeType,
    filename: data.filename,
  })

  return {
    success: true,
    output: { file },
  }
}

In API Route (for complex file handling)

// Return file data that FileToolProcessor can handle
return NextResponse.json({
  success: true,
  output: {
    file: {
      data: base64Content,
      mimeType: 'application/pdf',
      filename: 'document.pdf',
    },
  },
})

Key Helpers Reference

Advanced Mode for Optional Fields

Optional fields that are rarely used should be set to mode: 'advanced' so they don't clutter the basic UI. Examples: pagination tokens, time range filters, sort order, max results, reply settings.

WandConfig for Complex Inputs

Use wandConfig for fields that are hard to fill out manually:

• Timestamps: Use generationType: 'timestamp' to inject current date context into the AI prompt
• JSON arrays: Use generationType: 'json-object' for structured data
• Complex queries: Use a descriptive prompt explaining the expected format

{
  id: 'startTime',
  title: 'Start Time',
  type: 'short-input',
  mode: 'advanced',
  wandConfig: {
    enabled: true,
    prompt: 'Generate an ISO 8601 timestamp. Return ONLY the timestamp string.',
    generationType: 'timestamp',
  },
}

OAuth Scopes (Centralized System)

Scopes are maintained in a single source of truth and reused everywhere:

1. Define scopes in lib/oauth/oauth.ts under OAUTH_PROVIDERS[provider].services[service].scopes
2. Add descriptions in SCOPE_DESCRIPTIONS within lib/oauth/utils.ts for the OAuth modal UI
3. Reference in auth.ts using getCanonicalScopesForProvider(providerId) from @/lib/oauth/utils
4. Reference in blocks using getScopesForService(serviceId) from @/lib/oauth/utils

Never hardcode scope arrays in auth.ts or block requiredScopes. Always import from the centralized source.

// In auth.ts (Better Auth config)
scopes: getCanonicalScopesForProvider('{service}'),

// In block credential sub-block
requiredScopes: getScopesForService('{service}'),

Common Gotchas

1. OAuth serviceId must match - The serviceId in oauth-input must match the OAuth provider configuration
2. All tool IDs MUST be snake_case - stripe_create_payment, not stripeCreatePayment. This applies to tool id fields, registry keys, tools.access arrays, and tools.config.tool return values
3. Block type is snake_case - type: 'stripe', not type: 'Stripe'
4. Alphabetical ordering - Keep imports and registry entries alphabetically sorted
5. Required can be conditional - Use required: { field: 'op', value: 'create' } instead of always true
6. DependsOn clears options - When a dependency changes, selector options are refetched
7. Never pass Buffer directly to fetch - Convert to new Uint8Array(buffer) for TypeScript compatibility
8. Always handle legacy file params - Keep hidden fileContent params for backwards compatibility
9. Optional fields use advanced mode - Set mode: 'advanced' on rarely-used optional fields
10. Complex inputs need wandConfig - Timestamps, JSON arrays, and other hard-to-type values should have wandConfig enabled
11. Never hardcode scopes - Use getScopesForService() in blocks and getCanonicalScopesForProvider() in auth.ts
12. Always add scope descriptions - New scopes must have entries in SCOPE_DESCRIPTIONS within lib/oauth/utils.ts