register_pattern · Sourcesage MCP: Risk & Policy

WHAT IT DOES

What register_pattern does on Sourcesage

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

WHY IT NEEDS A POLICY

Why register_pattern needs a policy

This tool creates or adds new code pattern records to SourceSage's in-memory codebase model. While it modifies the knowledge store, the changes are reversible (patterns can be updated or cleared via sibling tools like 'clear_knowledge'), so it is Write rather than Destructive.

From the tool's definition Tool name 'register_pattern' with description 'Register a code pattern' indicates creation/modification of pattern data in the codebase knowledge store. The verb 'register' implies writing new pattern information into the system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_pattern Rate-limited

register_pattern 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": {
    "register_pattern": {
      "limits": [
        {
          "counter": "register_pattern_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about register_pattern

What does the register_pattern tool do? +

Register a code pattern. It is categorised as a Write tool in the Sourcesage MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on register_pattern? +

Register the Sourcesage MCP server in PolicyLayer and add a rule for register_pattern: 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 Sourcesage. Nothing to install.

What risk level is register_pattern? +

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

Can I rate-limit register_pattern? +

Yes. Add a rate_limit block to the register_pattern 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 register_pattern completely? +

Set action: deny in the PolicyLayer policy for register_pattern. 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 register_pattern? +

register_pattern is provided by the Sourcesage MCP server (mcpflow/sourcesage). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.