This record as markdown: /tools/io-github-dave-london-go/build.md
What build does on Go
AI agents invoke 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.
Why build is rated High
The tool executes a build command rather than merely reading or querying data. Build commands can invoke arbitrary code, shell scripts, and external tools defined in build files, making this an Execute-category risk. Severity is high because a malicious build configuration or crafted project could result in code execution, data exfiltration, or system compromise during the build process.
From the tool's definition Tool "build" "Runs a build command" — this directly executes a build operation, which may compile code, invoke external tools, or trigger side effects dependent on the project contents and build configuration.
Attacks that exploit this kind of access
The rule that runs build safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Go, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For build, this is the rule to start with:
build stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Go, apply this rule, and every build call is checked against it from then on.
Questions about build
Runs a build command and returns structured success/failure with errors and warnings. 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 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.
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 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 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.
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.
More on Go, and thousands of servers like it.
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