CircleCI MCP Server

Instructions

Input Schema

Input Schema (JSON Schema)

Implementation Reference

• src/tools/runPipeline/handler.ts:12-131 (handler)

  The main handler function for the 'run_pipeline' tool. It processes inputs to identify project and branch, handles multiple pipeline definitions, triggers the pipeline via CircleCI client, and returns the monitoring URL.
  export const runPipeline: ToolCallback<{ params: typeof runPipelineInputSchema; }> = async (args) => { const { workspaceRoot, gitRemoteURL, branch, configContent, projectURL, pipelineChoiceName, projectSlug: inputProjectSlug, } = args.params; let projectSlug: string | undefined; let branchFromURL: string | undefined; const baseURL = getAppURL(); if (inputProjectSlug) { if (!branch) { return mcpErrorOutput( 'Branch not provided. When using projectSlug, a branch must also be specified.', ); } projectSlug = inputProjectSlug; } else if (projectURL) { projectSlug = getProjectSlugFromURL(projectURL); branchFromURL = getBranchFromURL(projectURL); } else if (workspaceRoot && gitRemoteURL && branch) { projectSlug = await identifyProjectSlug({ gitRemoteURL, }); } else { return mcpErrorOutput( 'Missing required inputs. Please provide either: 1) projectSlug with branch, 2) projectURL, or 3) workspaceRoot with gitRemoteURL and branch.', ); } if (!projectSlug) { return mcpErrorOutput(` Project not found. Ask the user to provide the inputs user can provide based on the tool description. Project slug: ${projectSlug} Git remote URL: ${gitRemoteURL} Branch: ${branch} `); } const foundBranch = branchFromURL || branch; if (!foundBranch) { return mcpErrorOutput( 'No branch provided. Ask the user to provide the branch.', ); } const circleci = getCircleCIClient(); const { id: projectId } = await circleci.projects.getProject({ projectSlug, }); const pipelineDefinitions = await circleci.pipelines.getPipelineDefinitions({ projectId, }); const pipelineChoices = [ ...pipelineDefinitions.map((definition) => ({ name: definition.name, definitionId: definition.id, })), ]; if (pipelineChoices.length === 0) { return mcpErrorOutput( 'No pipeline definitions found. Please make sure your project is set up on CircleCI to run pipelines.', ); } const formattedPipelineChoices = pipelineChoices .map( (pipeline, index) => `${index + 1}. ${pipeline.name} (definitionId: ${pipeline.definitionId})`, ) .join('\n'); if (pipelineChoices.length > 1 && !pipelineChoiceName) { return { content: [ { type: 'text', text: `Multiple pipeline definitions found. Please choose one of the following:\n${formattedPipelineChoices}`, }, ], }; } const chosenPipeline = pipelineChoiceName ? pipelineChoices.find((pipeline) => pipeline.name === pipelineChoiceName) : undefined; if (pipelineChoiceName && !chosenPipeline) { return mcpErrorOutput( `Pipeline definition with name ${pipelineChoiceName} not found. Please choose one of the following:\n${formattedPipelineChoices}`, ); } const runPipelineDefinitionId = chosenPipeline?.definitionId || pipelineChoices[0].definitionId; const runPipelineResponse = await circleci.pipelines.runPipeline({ projectSlug, branch: foundBranch, definitionId: runPipelineDefinitionId, configContent, }); return { content: [ { type: 'text', text: `Pipeline run successfully. View it at: ${baseURL}/pipelines/${projectSlug}/${runPipelineResponse.number}`, }, ], }; };
• src/tools/runPipeline/inputSchema.ts:7-49 (schema)

  Zod input schema defining parameters for the run_pipeline tool, including projectSlug, branch, workspaceRoot, gitRemoteURL, projectURL, pipelineChoiceName, and configContent.
  export const runPipelineInputSchema = z.object({ projectSlug: z.string().describe(projectSlugDescription).optional(), branch: z.string().describe(branchDescription).optional(), workspaceRoot: z .string() .describe( 'The absolute path to the root directory of your project workspace. ' + 'This should be the top-level folder containing your source code, configuration files, and dependencies. ' + 'For example: "/home/user/my-project" or "C:\\Users\\user\\my-project"', ) .optional(), gitRemoteURL: z .string() .describe( 'The URL of the remote git repository. This should be the URL of the repository that you cloned to your local workspace. ' + 'For example: "https://github.com/user/my-project.git"', ) .optional(), projectURL: z .string() .describe( 'The URL of the CircleCI project. Can be any of these formats:\n' + '- Project URL with branch: https://app.circleci.com/pipelines/gh/organization/project?branch=feature-branch\n' + '- Pipeline URL: https://app.circleci.com/pipelines/gh/organization/project/123\n' + '- Workflow URL: https://app.circleci.com/pipelines/gh/organization/project/123/workflows/abc-def\n' + '- Job URL: https://app.circleci.com/pipelines/gh/organization/project/123/workflows/abc-def/jobs/xyz', ) .optional(), pipelineChoiceName: z .string() .describe( 'The name of the pipeline to run. This parameter is only needed if the project has multiple pipeline definitions. ' + 'If not provided and multiple pipelines exist, the tool will return a list of available pipelines for the user to choose from. ' + 'If provided, it must exactly match one of the pipeline names returned by the tool.', ) .optional(), configContent: z .string() .describe( 'The content of the CircleCI YAML configuration file for the pipeline.', ) .optional(), });
• src/tools/runPipeline/tool.ts:4-45 (registration)

  MCP tool registration object for 'run_pipeline' including name, detailed description, and reference to inputSchema.
  export const runPipelineTool = { name: 'run_pipeline' as const, description: ` This tool triggers a new CircleCI pipeline and returns the URL to monitor its progress. Input options (EXACTLY ONE of these THREE options must be used): ${option1DescriptionBranchRequired} Option 2 - Direct URL (provide ONE of these): - projectURL: The URL of the CircleCI project in any of these formats: * Project URL with branch: https://app.circleci.com/pipelines/gh/organization/project?branch=feature-branch * Pipeline URL: https://app.circleci.com/pipelines/gh/organization/project/123 * Workflow URL: https://app.circleci.com/pipelines/gh/organization/project/123/workflows/abc-def * Job URL: https://app.circleci.com/pipelines/gh/organization/project/123/workflows/abc-def/jobs/xyz Option 3 - Project Detection (ALL of these must be provided together): - workspaceRoot: The absolute path to the workspace root - gitRemoteURL: The URL of the git remote repository - branch: The name of the current branch Configuration: - an optional configContent parameter can be provided to override the default pipeline configuration Pipeline Selection: - If the project has multiple pipeline definitions, the tool will return a list of available pipelines - You must then make another call with the chosen pipeline name using the pipelineChoiceName parameter - The pipelineChoiceName must exactly match one of the pipeline names returned by the tool - If the project has only one pipeline definition, pipelineChoiceName is not needed Additional Requirements: - Never call this tool with incomplete parameters - If using Option 1, make sure to extract the projectSlug exactly as provided by listFollowedProjects - If using Option 2, the URLs MUST be provided by the user - do not attempt to construct or guess URLs - If using Option 3, ALL THREE parameters (workspaceRoot, gitRemoteURL, branch) must be provided - If none of the options can be fully satisfied, ask the user for the missing information before making the tool call Returns: - A URL to the newly triggered pipeline that can be used to monitor its progress `, inputSchema: runPipelineInputSchema, };
• src/circleci-tools.ts:30-72 (registration)

  Top-level registration of the run_pipeline tool in the CircleCI tools array (CCI_TOOLS) and handlers map (CCI_HANDLERS).
  export const CCI_TOOLS = [ getBuildFailureLogsTool, getFlakyTestLogsTool, getLatestPipelineStatusTool, getJobTestResultsTool, configHelperTool, createPromptTemplateTool, recommendPromptTemplateTestsTool, runPipelineTool, listFollowedProjectsTool, runEvaluationTestsTool, rerunWorkflowTool, analyzeDiffTool, runRollbackPipelineTool, ]; // Extract the tool names as a union type type CCIToolName = (typeof CCI_TOOLS)[number]['name']; export type ToolHandler<T extends CCIToolName> = ToolCallback<{ params: Extract<(typeof CCI_TOOLS)[number], { name: T }>['inputSchema']; }>; // Create a type for the tool handlers that directly maps each tool to its appropriate input schema type ToolHandlers = { [K in CCIToolName]: ToolHandler<K>; }; export const CCI_HANDLERS = { get_build_failure_logs: getBuildFailureLogs, find_flaky_tests: getFlakyTestLogs, get_latest_pipeline_status: getLatestPipelineStatus, get_job_test_results: getJobTestResults, config_helper: configHelper, create_prompt_template: createPromptTemplate, recommend_prompt_template_tests: recommendPromptTemplateTests, run_pipeline: runPipeline, list_followed_projects: listFollowedProjects, run_evaluation_tests: runEvaluationTests, rerun_workflow: rerunWorkflow, analyze_diff: analyzeDiff, run_rollback_pipeline: runRollbackPipeline, } satisfies ToolHandlers;