# 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

Agent View of the PolicyLayer registry record for `marchward_check_coverage`. HTML page: https://policylayer.com/tools/ai-marchward-mcp-server/marchward-check-coverage

## Facts

- Tool: `marchward_check_coverage`
- Server: Mcp Server (`@marchward/mcp-server`) — https://policylayer.com/tools/ai-marchward-mcp-server.md
- Install: `npx -y @marchward/mcp-server`
- Homepage: https://github.com/marchward/marchward
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "marchward_check_coverage",
    "arguments": {}
  }
}
```

## 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 own 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."

## Use case

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.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mcp Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "marchward_check_coverage": {}
  }
}
```

## Other tools on Mcp Server (6)

- `marchward_authorize` — Destructive — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-authorize.md
- `marchward_execute` — Execute — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-execute.md
- `marchward_get_decisions` — Read — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-get-decisions.md
- `marchward_list_agents` — Read — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-list-agents.md
- `marchward_bind_policy` — Write — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-bind-policy.md
- `marchward_register_agent` — Write — https://policylayer.com/tools/ai-marchward-mcp-server/marchward-register-agent.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=ai-marchward-mcp-server · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/ai-marchward-mcp-server