marchward_check_coverage
Find governance gaps for an agent by comparing its declared tools against the tools it has actually called. Returns a coverage percentage and the uncovered tools, so ungoverned actions surface before they cause harm. This is the
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What marchward_check_coverage does on Mcp Server
AI agents call marchward_check_coverage to retrieve information from Mcp Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why marchward_check_coverage is rated Low
This tool audits and reports on governance coverage without modifying any state, executing commands, or triggering external operations. It serves a security monitoring function by identifying discrepancies between declared and actual tool usage, making it a read-only inspection tool. The low severity reflects that misuse would only expose information about governance gaps, not cause direct harm.
From the tool's definition Tool description states it 'Find[s] governance gaps' by 'comparing' and 'Returns a coverage percentage and the uncovered tools' — purely informational operations with no side effects. The verb 'Find' and 'Returns' indicate data retrieval and analysis only.
Attacks that exploit this kind of access
The rule that runs marchward_check_coverage safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For marchward_check_coverage, this is the rule to start with:
marchward_check_coverage is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Server, apply this rule, and every marchward_check_coverage call is checked against it from then on.
Questions about marchward_check_coverage
Find governance gaps for an agent by comparing its declared tools against the tools it has actually called. Returns a coverage percentage and the uncovered tools, so ungoverned actions surface before they cause harm. This is the. It is categorised as a Read tool in the Mcp Server MCP Server, which means it retrieves data without modifying state.
Register the Mcp Server MCP server in PolicyLayer and add a rule for marchward_check_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 Mcp Server. Nothing to install.
marchward_check_coverage 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 marchward_check_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 marchward_check_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.
marchward_check_coverage is provided by the Mcp Server MCP server (@marchward/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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