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OpenAPI Specification
openapi: 3.0.3
info:
title: GC AI External Chat Skills API
version: 1.0.0
description: 'The GC AI External API allows programmatic access to GC AI''s chat capabilities. It''s designed for integration with workflow automation tools like Zapier, Make, n8n, or custom applications.
## Authentication
All API requests must include an API key in the `Authorization` header:
```
Authorization: gcai_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
```
API keys can be created in the GC AI app under **Settings → API**.
## Multi-turn Conversations
Conversations can span multiple turns: pass the `chat_id` returned by a completion back on your next request to continue the same chat. See [Multi-turn Conversations](/api-reference/concepts/multi-turn).
## Current Limitations
The following is not yet available via API:
- **Interactive clarification**: the model cannot pause to ask the caller a follow-up question; the `askUserQuestions` tool is disabled on the API surface in beta
## Usage
Usage is tracked and viewable in the GC AI app under **Settings → API → View Usage**.
## Support
For API support, contact [support@gc.ai](mailto:support@gc.ai) or reach out to your account representative.'
contact:
email: support@gc.ai
servers:
- url: https://app.gc.ai/api/external/v1
description: Production server
tags:
- name: Skills
description: Skill library management endpoints
paths:
/skills:
get:
summary: List skills
description: 'List skills accessible to the caller.
With a user-scoped key, returns skills the user created, org-visible skills, skills explicitly shared with the user, and official skills. With an org-scoped key, returns org-visible skills and official skills.'
operationId: listSkills
tags:
- Skills
security:
- ApiKeyAuth: []
parameters:
- schema:
type: integer
minimum: 1
maximum: 500
default: 100
description: Max items to return (default 100, max 500)
required: false
description: Max items to return (default 100, max 500)
name: limit
in: query
- schema:
type: integer
nullable: true
minimum: 0
default: 0
description: Number of items to skip (default 0)
required: false
description: Number of items to skip (default 0)
name: offset
in: query
- schema:
type: string
description: Optional case-insensitive search over skill name and description
required: false
description: Optional case-insensitive search over skill name and description
name: q
in: query
responses:
'200':
description: List of skills
content:
application/json:
schema:
$ref: '#/components/schemas/SkillListResponse'
'400':
description: Invalid query parameters
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Missing or malformed API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'403':
description: Invalid API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off.
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a rate-limit block.
example: '60'
required: true
description: Seconds to wait before retrying after a rate-limit block.
RateLimit-Limit:
schema:
type: string
description: Request quota for the applicable window.
example: '3'
required: true
description: Request quota for the applicable window.
RateLimit-Remaining:
schema:
type: string
description: Requests remaining in the current window.
example: '0'
required: true
description: Requests remaining in the current window.
RateLimit-Reset:
schema:
type: string
description: Seconds until the quota resets.
example: '60'
required: true
description: Seconds until the quota resets.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Service temporarily unavailable
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a transient service outage.
example: '5'
required: true
description: Seconds to wait before retrying after a transient service outage.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
post:
summary: Create a skill
description: 'Create a new skill in the caller''s organization.
User-scoped keys own the skill and default it to `private`; org-scoped keys create `organization`-visible skills. Official skills cannot be created via the API.'
operationId: createSkill
tags:
- Skills
security:
- ApiKeyAuth: []
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/CreateSkillRequest'
responses:
'201':
description: The created skill
content:
application/json:
schema:
$ref: '#/components/schemas/Skill'
'400':
description: Invalid request body
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Missing or malformed API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'403':
description: Invalid API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'422':
description: One or more `file_ids` were not found in the organization
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off.
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a rate-limit block.
example: '60'
required: true
description: Seconds to wait before retrying after a rate-limit block.
RateLimit-Limit:
schema:
type: string
description: Request quota for the applicable window.
example: '3'
required: true
description: Request quota for the applicable window.
RateLimit-Remaining:
schema:
type: string
description: Requests remaining in the current window.
example: '0'
required: true
description: Requests remaining in the current window.
RateLimit-Reset:
schema:
type: string
description: Seconds until the quota resets.
example: '60'
required: true
description: Seconds until the quota resets.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Service temporarily unavailable
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a transient service outage.
example: '5'
required: true
description: Seconds to wait before retrying after a transient service outage.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
/skills/{id}:
get:
summary: Get a skill
description: 'Fetch a single skill by ID, including its instructions and attached files.
Returns `404` if the skill does not exist or is not accessible to the caller. Official skills are readable by any caller; user skills follow the same visibility rules as `GET /skills`.'
operationId: getSkill
tags:
- Skills
security:
- ApiKeyAuth: []
parameters:
- schema:
type: string
format: uuid
description: Skill ID from `GET /skills`.
required: true
description: Skill ID from `GET /skills`.
name: id
in: path
responses:
'200':
description: The skill
content:
application/json:
schema:
$ref: '#/components/schemas/Skill'
'400':
description: Invalid skill ID format
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Missing or malformed API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'403':
description: Invalid API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'404':
description: Skill not found or not accessible to the caller
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off.
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a rate-limit block.
example: '60'
required: true
description: Seconds to wait before retrying after a rate-limit block.
RateLimit-Limit:
schema:
type: string
description: Request quota for the applicable window.
example: '3'
required: true
description: Request quota for the applicable window.
RateLimit-Remaining:
schema:
type: string
description: Requests remaining in the current window.
example: '0'
required: true
description: Requests remaining in the current window.
RateLimit-Reset:
schema:
type: string
description: Seconds until the quota resets.
example: '60'
required: true
description: Seconds until the quota resets.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Service temporarily unavailable
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a transient service outage.
example: '5'
required: true
description: Seconds to wait before retrying after a transient service outage.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
patch:
summary: Update a skill
description: 'Partially update a skill''s name, instructions, description, or attached files.
Requires write access to the skill. Official skills cannot be edited via the API. Visibility is not editable here — manage skill sharing in the GC AI app.'
operationId: updateSkill
tags:
- Skills
security:
- ApiKeyAuth: []
parameters:
- schema:
type: string
format: uuid
description: Skill ID from `GET /skills`.
required: true
description: Skill ID from `GET /skills`.
name: id
in: path
requestBody:
required: true
content:
application/json:
schema:
$ref: '#/components/schemas/UpdateSkillRequest'
responses:
'200':
description: The updated skill
content:
application/json:
schema:
$ref: '#/components/schemas/Skill'
'400':
description: Invalid request body or skill ID
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Missing or malformed API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'403':
description: Caller has read-only access to the skill
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'404':
description: Skill not found or not accessible to the caller
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'422':
description: One or more `file_ids` were not found in the organization
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off.
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a rate-limit block.
example: '60'
required: true
description: Seconds to wait before retrying after a rate-limit block.
RateLimit-Limit:
schema:
type: string
description: Request quota for the applicable window.
example: '3'
required: true
description: Request quota for the applicable window.
RateLimit-Remaining:
schema:
type: string
description: Requests remaining in the current window.
example: '0'
required: true
description: Requests remaining in the current window.
RateLimit-Reset:
schema:
type: string
description: Seconds until the quota resets.
example: '60'
required: true
description: Seconds until the quota resets.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Service temporarily unavailable
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a transient service outage.
example: '5'
required: true
description: Seconds to wait before retrying after a transient service outage.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
delete:
summary: Delete a skill
description: 'Delete a skill. Attached files are detached, not deleted — manage file lifecycle via the files API.
User-scoped keys require write access to the skill; org-scoped keys can delete org-visible (non-private) skills. Official skills cannot be deleted via the API.'
operationId: deleteSkill
tags:
- Skills
security:
- ApiKeyAuth: []
parameters:
- schema:
type: string
format: uuid
description: The skill ID to delete
required: true
description: The skill ID to delete
name: id
in: path
responses:
'200':
description: Skill successfully deleted
content:
application/json:
schema:
$ref: '#/components/schemas/DeleteSkillResponse'
'400':
description: Invalid skill ID format
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
description: Missing or malformed API key
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'403':
description: Caller has read-only access to the skill
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'404':
description: Skill not found or not accessible to the caller
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'429':
description: Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off.
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a rate-limit block.
example: '60'
required: true
description: Seconds to wait before retrying after a rate-limit block.
RateLimit-Limit:
schema:
type: string
description: Request quota for the applicable window.
example: '3'
required: true
description: Request quota for the applicable window.
RateLimit-Remaining:
schema:
type: string
description: Requests remaining in the current window.
example: '0'
required: true
description: Requests remaining in the current window.
RateLimit-Reset:
schema:
type: string
description: Seconds until the quota resets.
example: '60'
required: true
description: Seconds until the quota resets.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'500':
description: Internal server error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'503':
description: Service temporarily unavailable
headers:
Retry-After:
schema:
type: string
description: Seconds to wait before retrying after a transient service outage.
example: '5'
required: true
description: Seconds to wait before retrying after a transient service outage.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
components:
schemas:
DeleteSkillResponse:
type: object
properties:
deleted:
type: boolean
description: Always `true` on success
required:
- deleted
SkillFile:
type: object
properties:
id:
type: string
format: uuid
description: Attached file identifier
name:
type: string
description: Attached file name
required:
- id
- name
UpdateSkillRequest:
type: object
properties:
name:
type: string
minLength: 1
maxLength: 255
description: Updated skill name (1-255 chars)
content:
type: string
minLength: 1
maxLength: 100000
description: Updated skill instructions (1-100000 chars)
description:
type: string
nullable: true
maxLength: 1000
description: Updated description (max 1000 chars). Pass `null` or an empty string to clear it.
file_ids:
type: array
items:
type: string
format: uuid
maxItems: 50
description: Replacement set of attached file IDs (max 50). When provided, the skill's attachments are reconciled to exactly this list. Omit to leave attachments unchanged.
CreateSkillRequest:
type: object
properties:
name:
type: string
minLength: 1
maxLength: 255
description: Skill name (required, 1-255 chars)
example: NDA Risk Reviewer
content:
type: string
minLength: 1
maxLength: 100000
description: The skill instructions — the prompt text the model receives when the skill runs (required, 1-100000 chars)
example: Review the attached NDA and flag any clauses that deviate from our standard positions.
description:
type: string
nullable: true
maxLength: 1000
description: Optional short description of what the skill does (max 1000 chars)
visibility:
type: string
enum:
- private
- organization
description: Skill visibility. Defaults to `private` for user-scoped keys. Org-scoped keys always create `organization`-visible skills (they have no owning user).
file_ids:
type: array
items:
type: string
format: uuid
maxItems: 50
description: Optional uploaded file IDs to attach as reference context (max 50). Upload files first via `POST /files`.
required:
- name
- content
SkillListResponse:
type: object
properties:
skills:
type: array
items:
$ref: '#/components/schemas/Skill'
pagination:
$ref: '#/components/schemas/Pagination'
required:
- skills
- pagination
Skill:
type: object
properties:
id:
type: string
format: uuid
description: Unique skill identifier
name:
type: string
description: Skill name
description:
type: string
nullable: true
description: Short description of what the skill does, or null if unset
content:
type: string
description: The skill instructions — the prompt text the model receives when the skill runs
visibility:
type: string
enum:
- private
- organization
description: '`private` (only the creator and users it has been explicitly shared with) or `organization` (visible to everyone in the org). Official skills report `organization`.'
is_official:
type: boolean
description: Whether this is an official GC AI skill. Official skills are read-only and cannot be edited or deleted via the API.
files:
type: array
items:
$ref: '#/components/schemas/SkillFile'
description: Files attached to the skill as reference context
created_at:
type: string
nullable: true
description: ISO 8601 creation timestamp
updated_at:
type: string
nullable: true
description: ISO 8601 last-updated timestamp
required:
- id
- name
- description
- content
- visibility
- is_official
- files
- created_at
- updated_at
Pagination:
type: object
properties:
limit:
type: number
description: Page size
offset:
type: number
description: Current offset
has_more:
type: boolean
description: Whether more results exist
required:
- limit
- offset
- has_more
Error:
type: object
properties:
error:
type: string
description: Error message
code:
type: string
description: Machine-readable error code present on some errors (e.g. `RATE_LIMITED`, `INSUFFICIENT_CREDITS`, `TRIAL_NOT_STARTED`, `BILLING_NOT_CONFIGURED`). Branch on this rather than the human-readable `error` string.
message:
type: string
description: Additional error details
details:
type: object
additionalProperties:
nullable: true
description: Validation error details (for 400 errors)
required:
- error
securitySchemes:
ApiKeyAuth:
type: apiKey
in: header
name: Authorization
description: 'API key for authentication. Format: `gcai_xxxxxxxxx`
Create API keys in the GC AI app under Settings → API.'