> ## Documentation Index > Fetch the complete documentation index at: https://docs.axilio.ai/llms.txt > Use this file to discover all available pages before exploring further. # Add a revision > Appends a revision to an agent, instructions or code, and makes it the one runs use. Revisions are never changed or removed. Minimum role required: Member ## OpenAPI ````yaml /api-reference/openapi-backend.json post /agents/{agent_id}/revisions openapi: 3.1.0 info: description: Axilio backend HTTP API. title: Axilio API version: 0.155.0 servers: - url: https://api.axilio.ai/api/v1 description: Production security: [] tags: - name: Agents - name: API Keys - name: Billing - name: Conversations - name: Files - name: Messages - name: Models - name: Organization - name: Phones - name: Runs - name: Sessions - name: Skill - name: Usage - name: Webhooks paths: /agents/{agent_id}/revisions: post: tags: - Agents summary: Add a revision description: >- Appends a revision to an agent, instructions or code, and makes it the one runs use. Revisions are never changed or removed. operationId: agents_create_revision parameters: - description: The agent's id. in: path name: agent_id required: true schema: description: The agent's id. format: uuid type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/AgentRevisionCreateRequest' required: true responses: '201': content: application/json: schema: $ref: '#/components/schemas/AgentRevision' description: Created '400': content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Bad Request '403': content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Forbidden '404': content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Not Found '422': content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Unprocessable Entity '500': content: application/problem+json: schema: $ref: '#/components/schemas/V2ErrorModel' description: Internal Server Error security: - apiKeyAuth: [] components: schemas: AgentRevisionCreateRequest: additionalProperties: false description: >- Request body for adding a revision. The new revision becomes the agent's current one. properties: code: description: The script, for a code revision. type: string instructions: description: The task, for an instructions revision. maxLength: 20000 type: string kind: description: code needs code; instructions needs instructions. enum: - code - instructions type: string message: description: A note on the revision. maxLength: 500 type: string on_failure: description: >- For a code revision, what a run does when a step fails. fail fails the run. ask pauses the run for a person (reason step_check_failed), who retries the step or completes the run with its output. repair hands the run to the agent, which finishes the task and proposes a fixed revision for a person to promote. Defaults to the current revision's, or fail. enum: - fail - ask - repair type: string required: - kind type: object AgentRevision: additionalProperties: false description: >- One revision of an agent: instructions or code. Revisions are append-only. properties: agent_id: description: The agent the revision belongs to. format: uuid type: string author_user_id: description: >- The user who added the revision. Null once they have deleted their account. format: uuid type: - string - 'null' base_revision_id: description: On a proposed fix, the revision the repaired run ran. format: uuid type: string code: description: The script, on a code revision. type: string created_at: description: When the revision was added. format: date-time type: string id: description: The revision's id. format: uuid type: string instructions: description: The task, on an instructions revision. type: string kind: description: >- code: the revision is a script. instructions: the revision is a task the agent works through a model. enum: - code - instructions type: string message: description: The author's note on the revision. type: string on_failure: description: >- On a code revision, what a run does when a step fails: fail the run, ask (pause for a person, who retries the step or completes the run), or repair (the agent takes over and proposes a fix). enum: - fail - ask - repair type: string promoted_at: description: On a proposed fix, when it was promoted to current. format: date-time type: string proposal_state: description: >- Set when the revision is a fix a repair proposed, which is not current until promoted: waiting to be promoted, superseded (the agent has moved on from the revision it fixes, so it can't be promoted), or promoted. enum: - waiting - superseded - promoted type: string revision: description: The revision's number within the agent, from 1. format: int64 type: integer source_run_id: description: >- The run the revision came from: on a proposed fix, the run whose repair wrote it; on an agent saved from a run, that run. format: uuid type: string required: - id - agent_id - revision - kind - author_user_id - created_at type: object V2ErrorModel: additionalProperties: false description: >- Error response, following RFC 9457 (Problem Details for HTTP APIs). Returned with a application/problem+json content type. properties: detail: description: >- A human-readable explanation specific to this occurrence of the problem. examples: - Property foo is required but is missing. type: string errors: description: Optional list of individual error details items: $ref: '#/components/schemas/V2ErrorDetail' type: - array - 'null' instance: description: >- A URI reference that identifies the specific occurrence of the problem. examples: - https://example.com/error-log/abc123 format: uri type: string status: description: HTTP status code examples: - 400 format: int64 type: integer title: description: >- A short, human-readable summary of the problem type. This value should not change between occurrences of the error. examples: - Bad Request type: string type: default: about:blank description: A URI reference to human-readable documentation for the error. examples: - https://example.com/errors/example format: uri type: string type: object V2ErrorDetail: additionalProperties: false description: >- One specific problem within an error response, locating the offending part of the request. properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object securitySchemes: apiKeyAuth: description: Customer API key (axl_ prefix). in: header name: X-Axilio-Api-Key type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.