Jenkins MCP Server

Instructions

Implementation Reference

• src/tools/build-management.js:268-337 (handler)

  The main handler function for the 'stopBuild' tool. It checks if the specified build is running, attempts a graceful stop via the Jenkins /stop endpoint, and falls back to a forceful kill via /kill if necessary. Handles errors and returns formatted success/failure responses.

  export async function stopBuild(client, args) {
  	const { jobFullName, buildNumber = null } = args;
  	const jobPath = encodeJobPath(jobFullName);
  	const buildPath = buildNumber || "lastBuild";
  
  	try {
  		// Get actual build number and check if build is running
  		const buildInfo = await client.get(
  			`${client.baseUrl}/job/${jobPath}/${buildPath}/api/json?tree=number,building,result,url`
  		);
  
  		if (buildInfo.status !== 200) {
  			return failure(
  				"stopBuild",
  				`Build not found: ${jobFullName}#${buildPath}`,
  				{ statusCode: buildInfo.status }
  			);
  		}
  
  		const actualBuildNumber = buildInfo.data.number;
  		const isBuilding = buildInfo.data.building;
  		const buildUrl = buildInfo.data.url;
  
  		if (!isBuilding) {
  			return failure(
  				"stopBuild",
  				`Build #${actualBuildNumber} is not currently running`,
  				{ buildResult: buildInfo.data.result, buildUrl }
  			);
  		}
  
  		// Try to stop the build (graceful stop)
  		const stopResponse = await client.post(
  			`${client.baseUrl}/job/${jobPath}/${actualBuildNumber}/stop`,
  			null
  		);
  
  		if (isSuccessStatus(stopResponse.status)) {
  			return success("stopBuild", {
  				message: `Build #${actualBuildNumber} stop request sent successfully`,
  				buildNumber: actualBuildNumber,
  				buildUrl,
  				action: "stop",
  			});
  		}
  
  		// If stop fails, try kill (forceful termination)
  		const killResponse = await client.post(
  			`${client.baseUrl}/job/${jobPath}/${actualBuildNumber}/kill`,
  			null
  		);
  
  		if (isSuccessStatus(killResponse.status)) {
  			return success("stopBuild", {
  				message: `Build #${actualBuildNumber} kill request sent successfully`,
  				buildNumber: actualBuildNumber,
  				buildUrl,
  				action: "kill",
  			});
  		}
  
  		return failure(
  			"stopBuild",
  			`Failed to stop build #${actualBuildNumber}`,
  			{ statusCode: stopResponse.status }
  		);
  	} catch (error) {
  		return formatError(error, "stopBuild");
  	}
  }

• src/tools/index.js:51-70 (registration)

  The registration of the 'stopBuild' tool in the central toolRegistry. Defines the tool's name, description, input schema (requiring jobFullName, optional buildNumber), and references the handler function.

  stopBuild: {
  	name: "stopBuild",
  	description: "Stop/kill a running Jenkins build",
  	inputSchema: {
  		type: "object",
  		properties: {
  			jobFullName: {
  				type: "string",
  				description: "Full path of the Jenkins job",
  			},
  			buildNumber: {
  				type: "integer",
  				description:
  					"Build number to stop (optional, defaults to last build)",
  			},
  		},
  		required: ["jobFullName"],
  	},
  	handler: stopBuild,
  },

• src/tools/index.js:54-68 (schema)

  The input schema for the stopBuild tool, defining the expected parameters: jobFullName (required string) and buildNumber (optional integer). Used for MCP tool validation.

  inputSchema: {
  	type: "object",
  	properties: {
  		jobFullName: {
  			type: "string",
  			description: "Full path of the Jenkins job",
  		},
  		buildNumber: {
  			type: "integer",
  			description:
  				"Build number to stop (optional, defaults to last build)",
  		},
  	},
  	required: ["jobFullName"],
  },