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1 change: 1 addition & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -400,6 +400,7 @@ The plugin provides the following built-in tools for interacting with Jenkins:
- `getReplayScripts`: Return the main script and loaded scripts of a replayable Pipeline build. Use this to inspect or modify script before calling `replayBuild`. Fails for non-Pipeline jobs. Optional `buildNumber`; defaults to the last build.
- `replayBuild`: Run a Pipeline build again with a modified script. Provide `mainScript` (required) and optionally `loadedScripts`. Optional `buildNumber`; defaults to the last build. Fails if the build is not replayable or replay is not allowed (e.g. permissions or sandbox).
- `getTestResults`: Retrieve test results of a specific build or the last build.
- `cancelBuild`: Cancel a running build.

#### SCM Integration
- `getJobScm`: Retrieve SCM configurations of a Jenkins job.
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10 changes: 5 additions & 5 deletions pom.xml
Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,11 @@
<artifactId>workflow-cps</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.jenkins-ci.plugins.workflow</groupId>
<artifactId>workflow-job</artifactId>
<optional>true</optional>
</dependency>

<!-- compile time only dependencies -->
<dependency>
Expand Down Expand Up @@ -238,11 +243,6 @@
<artifactId>workflow-durable-task-step</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jenkins-ci.plugins.workflow</groupId>
<artifactId>workflow-job</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jenkins-ci.plugins.workflow</groupId>
<artifactId>workflow-step-api</artifactId>
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@
import static io.jenkins.plugins.mcp.server.extensions.util.ParameterValueFactory.createParameterValue;

import hudson.Extension;
import hudson.model.AbstractBuild;
import hudson.model.AbstractItem;
import hudson.model.Action;
import hudson.model.AdministrativeMonitor;
Expand All @@ -50,6 +51,8 @@
import io.jenkins.plugins.mcp.server.annotation.ToolParam;
import io.jenkins.plugins.mcp.server.tool.JenkinsMcpContext;
import jakarta.annotation.Nullable;
import jakarta.servlet.ServletException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
Expand All @@ -65,6 +68,7 @@
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.jenkinsci.plugins.workflow.cps.replay.ReplayAction;
import org.jenkinsci.plugins.workflow.job.WorkflowRun;
import org.kohsuke.stapler.export.Exported;

@Extension
Expand All @@ -73,6 +77,35 @@ public class DefaultMcpServer implements McpServerExtension {

public static final String FULL_NAME = "fullName";

public static boolean isWorkflowJobPluginInstalled() {
var plugin = Jenkins.get().getPluginManager().getPlugin("workflow-job");
return plugin != null && plugin.isActive();
}

@Tool(description = "Cancel specific build")
public boolean cancelBuild(
@ToolParam(description = "Job full name of the Jenkins job (e.g., 'folder/job-name')") String jobFullName,
@ToolParam(description = "Build number") Integer buildNumber)
throws ServletException, IOException {
var job = Jenkins.get().getItemByFullName(jobFullName, Job.class);
if (job == null || !job.hasPermission(Item.CANCEL)) {
return false;
}

var build = job.getBuildByNumber(buildNumber);
if (build == null || !build.isBuilding()) {
return false;
}
if (build instanceof AbstractBuild<?, ?> ab) {
ab.doStop();
} else if (isWorkflowJobPluginInstalled() && build instanceof WorkflowRun wr) {
wr.doStop();
} else {
return false;
}
return true;
}

@Tool(
description = "Get a specific build or the last build of a Jenkins job",
annotations = @Tool.Annotations(readOnlyHint = true, destructiveHint = false))
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,8 @@ void testListTools(JenkinsRule jenkins, JenkinsMcpClientBuilder jenkinsMcpClient
"getStatus",
"getTestResults",
"getFlakyFailures",
"getQueueItem");
"getQueueItem",
"cancelBuild");

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should be documented in the README as well

}
}

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Original file line number Diff line number Diff line change
@@ -0,0 +1,170 @@
/*
*
* The MIT License
*
* Copyright (c) 2025, Gong Yi.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/

package io.jenkins.plugins.mcp.server.extensions;

import static io.jenkins.plugins.mcp.server.junit.TestUtils.MIN_1;
import static org.assertj.core.api.Assertions.assertThat;

import hudson.model.FreeStyleProject;
import hudson.model.Item;
import io.jenkins.plugins.mcp.server.junit.JenkinsMcpClientBuilder;
import io.jenkins.plugins.mcp.server.junit.McpClientTest;
import io.jenkins.plugins.mcp.server.junit.TestUtils;
import io.modelcontextprotocol.spec.McpSchema;
import java.util.Base64;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;
import jenkins.model.Jenkins;
import org.jenkinsci.plugins.workflow.cps.CpsFlowDefinition;
import org.jenkinsci.plugins.workflow.job.WorkflowJob;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import org.jvnet.hudson.test.JenkinsRule;
import org.jvnet.hudson.test.MockAuthorizationStrategy;
import org.jvnet.hudson.test.SleepBuilder;
import org.jvnet.hudson.test.junit.jupiter.WithJenkins;

@WithJenkins
class CancelBuildTest {

static Stream<Arguments> cancelBuildTestParameters() {
Stream<Arguments> baseArgs = Stream.of(
// run already finished
Arguments.of("canceller", 1, "pipeline", false, true),
// run successfully cancelled
Arguments.of("canceller", 2, "pipeline", true, false),
// run not existing
Arguments.of("canceller", 3, "pipeline", false, true),
// job not existing
Arguments.of("canceller", 1, "missing", false, true),
// missing permission to cancel
Arguments.of("reader", 2, "pipeline", false, true),
// missing permission to see job
Arguments.of("unknown", 2, "pipeline", false, true));
return TestUtils.appendMcpClientArgs(baseArgs);
}

@ParameterizedTest
@MethodSource("cancelBuildTestParameters")
void testMcpToolCallCancelBuildPipeline(
String user,
int buildNumber,
String jobNameToCancel,
boolean expectedResults,
boolean expectedRunning,
JenkinsMcpClientBuilder jenkinsMcpClientBuilder,
JenkinsRule jenkins)
throws Exception {
enableSecurity(jenkins);
WorkflowJob project = jenkins.createProject(WorkflowJob.class, "pipeline");
project.setDefinition(new CpsFlowDefinition("", true));
var finishedBuild = project.scheduleBuild2(0).get();
assertThat(finishedBuild.isBuilding()).isFalse();
project.setDefinition(new CpsFlowDefinition("sleep 30", true));
var runningBuild = project.scheduleBuild2(0).waitForStart();

String authString = user + ":" + user;
String encodedAuth = Base64.getEncoder().encodeToString(authString.getBytes());
try (var client = jenkinsMcpClientBuilder
.jenkins(jenkins)
.requestCustomizer((builder, method, endpoint, body, context) ->
builder.setHeader("Authorization", "Basic " + encodedAuth))
.build()) {
{
McpSchema.CallToolRequest request = new McpSchema.CallToolRequest(
"cancelBuild", Map.of("jobFullName", jobNameToCancel, "buildNumber", buildNumber), null);

var response = client.callTool(request);
assertThat(response.isError()).isFalse();
assertThat(response.content().get(0).type()).isEqualTo("text");
assertThat(response.content())
.first()
.isInstanceOfSatisfying(McpSchema.TextContent.class, textContent -> {
assertThat(textContent.type()).isEqualTo("text");
assertThat(textContent.text()).contains(String.valueOf(expectedResults));
});
TimeUnit.SECONDS.sleep(2);
assertThat(runningBuild.isBuilding()).isEqualTo(expectedRunning);
runningBuild.doStop();
}
}
jenkins.waitUntilNoActivityUpTo(MIN_1);
}

@McpClientTest
void testMcpToolCallCancelBuildFreestyle(JenkinsRule jenkins, JenkinsMcpClientBuilder jenkinsMcpClientBuilder)
throws Exception {
enableSecurity(jenkins);
FreeStyleProject project = jenkins.createFreeStyleProject("freestyle");
project.getBuildersList().add(new SleepBuilder(30000));
var build = project.scheduleBuild2(0).waitForStart();

String username = "admin";
String password = "admin";
String authString = username + ":" + password;
String encodedAuth = Base64.getEncoder().encodeToString(authString.getBytes());
try (var client = jenkinsMcpClientBuilder
.jenkins(jenkins)
.requestCustomizer((builder, method, endpoint, body, context) ->
builder.setHeader("Authorization", "Basic " + encodedAuth))
.build()) {
{
McpSchema.CallToolRequest request = new McpSchema.CallToolRequest(
"cancelBuild", Map.of("jobFullName", "freestyle", "buildNumber", 1), null);

var response = client.callTool(request);
assertThat(response.isError()).isFalse();
assertThat(response.content().get(0).type()).isEqualTo("text");
assertThat(response.content())
.first()
.isInstanceOfSatisfying(McpSchema.TextContent.class, textContent -> {
assertThat(textContent.type()).isEqualTo("text");
assertThat(textContent.text()).contains("true");
});

assertThat(build.isBuilding()).isFalse();
}
}
jenkins.waitUntilNoActivityUpTo(MIN_1);
}

private void enableSecurity(JenkinsRule jenkins) throws Exception {
JenkinsRule.DummySecurityRealm securityRealm = jenkins.createDummySecurityRealm();
jenkins.jenkins.setSecurityRealm(securityRealm);
var authStrategy = new MockAuthorizationStrategy()
.grant(Jenkins.ADMINISTER)
.everywhere()
.to("admin");
authStrategy.grant(Jenkins.READ).everywhere().toEveryone();
authStrategy.grant(Item.READ).everywhere().to("canceller", "reader");
authStrategy.grant(Item.CANCEL).everywhere().to("canceller");
jenkins.jenkins.setAuthorizationStrategy(authStrategy);
jenkins.jenkins.save();
}
}
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