count
Counts pattern matches per file using ripgrep. Returns per-file match counts and totals.
This record as markdown: /tools/io-github-dave-london-build/count.md
What count does on Build
AI agents call count to retrieve information from Build without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why count is rated Low
This tool performs pattern matching and counting across files, which is a read-only information retrieval operation. It uses ripgrep (a standard search utility) to find matches and report statistics. There is no capability to modify, execute, delete, or affect external systems. The blast radius of misuse is minimal—an attacker could only gather information about code patterns or file contents.
From the tool's definition Tool description states it 'Counts pattern matches per file using ripgrep' and 'Returns per-file match counts and totals' — purely a search/query operation with no modifications or side effects.
Attacks that exploit this kind of access
The rule that runs count safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Build, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For count, this is the rule to start with:
count 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 Build, apply this rule, and every count call is checked against it from then on.
Questions about count
Counts pattern matches per file using ripgrep. Returns per-file match counts and totals. It is categorised as a Read tool in the Build MCP Server, which means it retrieves data without modifying state.
Register the Build MCP server in PolicyLayer and add a rule for count: 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 Build. Nothing to install.
count 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 count 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 count. 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.
count is provided by the Build 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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