AI agents invoke compose-build to trigger actions in Go. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
Building Docker images executes code defined in Dockerfiles and can run arbitrary commands, shell scripts, and package installations. This is an Execute operation because the effects depend on the Dockerfile contents and build arguments, potentially affecting the host environment, network, and file system.
From the tool's definition Tool 'compose-build' performs Docker Compose image builds. The description states it 'Builds Docker Compose service images', which involves executing build processes that run arbitrary Dockerfile instructions and shell commands within containers.
Attacks that exploit this kind of access
Builds Docker Compose service images and returns structured per-service build status. It is categorised as a Execute tool in the Go MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Go MCP server in PolicyLayer and add a rule for compose-build: 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 Go. Nothing to install.
compose-build is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the compose-build 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 compose-build. 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.
compose-build is provided by the Go MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.