coverage
Runs tests with coverage and returns structured coverage summary per file.
This record as markdown: /tools/io-github-dave-london-cargo/coverage.md
What coverage does on Cargo
AI agents invoke coverage to trigger actions in Cargo. 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 coverage is rated High
This tool executes code (runs the test suite) and collects coverage metrics. It triggers external operations (cargo test with coverage instrumentation) whose effects depend on the project's test code. It goes beyond merely reading data, as it actively compiles and runs code.
From the tool's definition 'Runs tests with coverage' — actively executes the test suite and collects coverage data
Attacks that exploit this kind of access
The rule that runs coverage safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Cargo, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For coverage, this is the rule to start with:
coverage 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 Cargo, apply this rule, and every coverage call is checked against it from then on.
Questions about coverage
Runs tests with coverage and returns structured coverage summary per file. It is categorised as a Execute tool in the Cargo MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Cargo MCP server in PolicyLayer and add a rule for coverage: 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 Cargo. Nothing to install.
coverage 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 coverage 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 coverage. 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.
coverage is provided by the Cargo MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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