> ## Documentation Index > Fetch the complete documentation index at: https://docs.tracks.alpic.ai/llms.txt > Use this file to discover all available pages before exploring further. # Cancel an execution > Starts none of its runs left and cancels those started. Canceling an execution already canceled does nothing. ## OpenAPI ````yaml https://tracks.alpic.ai/api/openapi.json post /executions/{id}/cancel openapi: 3.1.0 info: title: Tracks API version: 0.0.1 description: >- Run coding agents such as Claude Code in isolated sandboxes with an API key of your organization. Create a run with a prompt, then follow its output and what it costs, or launch an experiment to compare agents on your scenarios. servers: - url: https://tracks.alpic.ai/api security: [] tags: - name: Runs description: Start coding agents and follow their work. - name: Files description: Upload files to place in a run's sandbox. - name: Connections description: >- Let agents use MCP servers as one of their users, without their credentials entering the sandbox. - name: Experiments description: >- Define scenarios to give several agents in several variants, judged on what they did. - name: Executions description: Launch experiments and read their results. - name: Library description: What your experiments can give their agents. - name: System paths: /executions/{id}/cancel: post: tags: - Executions summary: Cancel an execution description: >- Starts none of its runs left and cancels those started. Canceling an execution already canceled does nothing. operationId: executions.cancel parameters: - name: id in: path schema: $ref: '#/components/schemas/ExecutionId' required: true responses: '202': description: >- One launch of an experiment: a run for every scenario, variant, agent and repetition, with the experiment as it was when launched. content: application/json: schema: $ref: '#/components/schemas/Execution' '400': description: >- The request is invalid: a value is missing, has the wrong type or is out of range. Fix it before sending the request again. content: application/json: schema: $ref: '#/components/schemas/InvalidRequestEncoded' '401': description: >- The API key is missing, malformed or revoked, or its organization is closed. content: application/json: schema: $ref: '#/components/schemas/ApiKeyRefusedEncoded' '404': description: No execution with this id exists in your organization. content: application/json: schema: $ref: '#/components/schemas/ExecutionNotFoundEncoded' security: - bearer: [] components: schemas: ExecutionId: type: string description: Unique identifier of the execution. Execution: type: object properties: id: $ref: '#/components/schemas/ExecutionId' experiment_id: $ref: '#/components/schemas/ExperimentId' number: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: Its place among the experiment's executions, from 1. launched_at: type: string canceled_at: type: string pending: type: boolean description: >- Whether some of its runs have not ended yet or wait for their evaluation results. Its pass rate is final once it is `false`, canceled or not. slots: type: object properties: total: type: integer minimum: 0 maximum: 9007199254740991 description: Runs the execution plans. running: type: integer minimum: 0 maximum: 9007199254740991 description: Runs not started yet or not ended. judging: type: integer minimum: 0 maximum: 9007199254740991 description: Ended runs waiting for their evaluation results. judged: type: integer minimum: 0 maximum: 9007199254740991 description: Runs with a verdict. passed: type: integer minimum: 0 maximum: 9007199254740991 description: Runs that passed their scenario. required: - total - running - judging - judged - passed additionalProperties: false description: >- How many of its slots, one per scenario, variant, agent and repetition, stand where. pass_rate: type: integer minimum: 0 maximum: 100 description: >- Runs that passed out of those with a verdict, as a whole percent. Absent until one run has a verdict. cost_usd: anyOf: - type: number - type: string enum: - Infinity - '-Infinity' - NaN required: - id - experiment_id - number - launched_at - pending - slots - cost_usd additionalProperties: false description: >- One launch of an experiment: a run for every scenario, variant, agent and repetition, with the experiment as it was when launched. InvalidRequestEncoded: type: object properties: _tag: type: string enum: - InvalidRequest message: type: string description: Every problem found, in one sentence. location: type: string enum: - path - query - header - body description: The part of the request that is wrong. issues: type: array items: $ref: '#/components/schemas/RequestIssue' description: Each problem found, with where it is. required: - _tag - message - location - issues additionalProperties: false ApiKeyRefusedEncoded: type: object properties: _tag: type: string enum: - ApiKeyRefused message: type: string required: - _tag - message additionalProperties: false ExecutionNotFoundEncoded: type: object properties: _tag: type: string enum: - ExecutionNotFound message: type: string required: - _tag - message additionalProperties: false ExperimentId: type: string description: Unique identifier of the experiment. RequestIssue: type: object properties: path: type: array items: anyOf: - type: string - type: number - type: string enum: - Infinity - '-Infinity' - NaN description: >- Keys leading to the wrong value inside that part of the request, such as `["agent", "model"]`. Empty when the problem concerns that part as a whole. message: type: string description: What is wrong with the value. required: - path - message additionalProperties: false description: One problem found in the request. securitySchemes: bearer: description: >- An API key of your organization, starting with `trk_`, sent as `Authorization: Bearer `. type: http scheme: bearer ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.