AI agents call get_build_failure_excerpt to retrieve information from Jenkins without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and extracts failure information from build logs through scanning operations. It performs data retrieval only—reading log content to identify failures and tests—without creating, modifying, executing, or deleting any data. The incremental log scanning is a read-based operation.
From the tool's definition Tool name 'get_build_failure_excerpt' and description 'Get focused failure excerpts and failing tests via incremental log scanning' indicate retrieval of build log data with no modification or side effects.
Attacks that exploit this kind of access
Get focused failure excerpts and failing tests via incremental log scanning. It is categorised as a Read tool in the Jenkins MCP Server, which means it retrieves data without modifying state.
Register the Jenkins MCP server in PolicyLayer and add a rule for get_build_failure_excerpt: 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. Nothing to install.
get_build_failure_excerpt is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_build_failure_excerpt 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.
Set action: deny in the PolicyLayer policy for get_build_failure_excerpt. 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.
get_build_failure_excerpt is provided by the Jenkins MCP server (mcpland/jenkins-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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