write_codified_patterns · My First MCP Server MCP

WHAT IT DOES

What write_codified_patterns does on My First MCP Server

AI agents use write_codified_patterns to create or update resources in My First MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your My First MCP Server environment.

WHY IT NEEDS A POLICY

Why write_codified_patterns needs a policy

This tool creates or modifies a configuration file in the repository. While the action is reversible (the file can be edited or deleted), it modifies project state by writing to a standard GitHub Copilot configuration location. This could affect AI assistant behavior across the repository.

From the tool's definition The tool description explicitly states it 'Write[s] analyzed patterns and practices' and targets a specific file '.github/copilot-instructions.md'. The verb 'write' combined with file output indicates data creation/modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_codified_patterns Rate-limited

write_codified_patterns stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "write_codified_patterns": {
      "limits": [
        {
          "counter": "write_codified_patterns_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches My First MCP Server, so you can run agents against it safely.

FAQ

Questions about write_codified_patterns

What does the write_codified_patterns tool do? +

Write analyzed patterns and practices to .github/copilot-instructions.md (GitHub Copilot standard location). It is categorised as a Write tool in the My First MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on write_codified_patterns? +

Register the My First MCP Server MCP server in PolicyLayer and add a rule for write_codified_patterns: 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 My First MCP Server. Nothing to install.

What risk level is write_codified_patterns? +

write_codified_patterns is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit write_codified_patterns? +

Yes. Add a rate_limit block to the write_codified_patterns 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.

How do I block write_codified_patterns completely? +

Set action: deny in the PolicyLayer policy for write_codified_patterns. 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.

What MCP server provides write_codified_patterns? +

write_codified_patterns is provided by the My First MCP Server MCP server (sethdavis512/my-first-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.