updateBuild · Jenkins MCP Server MCP: Risk & Policy

WHAT IT DOES

What updateBuild does on Jenkins MCP Server

AI agents use updateBuild to create or update resources in Jenkins MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Jenkins MCP Server environment.

WHY IT NEEDS A POLICY

Why updateBuild needs a policy

The tool modifies build attributes (display name and description) but does not delete, execute code, move money, or trigger new build processes. It is a reversible write operation on build metadata. Severity is medium because unauthorized modification of build metadata could obscure audit trails or confuse CI/CD visibility, but the changes are not destructive and can be undone.

From the tool's definition Tool name 'updateBuild' combined with description 'Update build display name and/or description' indicates modification of existing build metadata. This is reversible (display names and descriptions can be changed again or reverted).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

updateBuild Rate-limited

updateBuild stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "updateBuild": {
      "limits": [
        {
          "counter": "updatebuild_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Jenkins MCP Server, so you can run agents against it safely.

FAQ

Questions about updateBuild

What does the updateBuild tool do? +

Update build display name and/or description. It is categorised as a Write tool in the Jenkins MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on updateBuild? +

Register the Jenkins MCP Server MCP server in PolicyLayer and add a rule for updateBuild: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Jenkins MCP Server. Nothing to install.

What risk level is updateBuild? +

updateBuild is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit updateBuild? +

Yes. Add a rate_limit block to the updateBuild rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block updateBuild completely? +

Set action: deny in the PolicyLayer policy for updateBuild. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides updateBuild? +

updateBuild is provided by the Jenkins MCP Server MCP server (umishra1504/jenkins-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.