register_relationship · Sourcesage MCP: Risk & Policy

WHAT IT DOES

What register_relationship does on Sourcesage

AI agents use register_relationship 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_relationship needs a policy

This tool creates or establishes new relationships between entities in the knowledge base, which is a write operation that modifies the stored state. It is reversible (relationships can presumably be cleared or updated), so it does not rise to Destructive.

From the tool's definition Tool name 'register' and description 'Register a relationship between entities' indicate creation of new data structures. The context of SourceSage (a codebase memorization system) confirms this creates new relationships that can be stored and retrieved.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

register_relationship Rate-limited

register_relationship 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_relationship": {
      "limits": [
        {
          "counter": "register_relationship_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_relationship

What does the register_relationship tool do? +

Register a relationship between entities. 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_relationship? +

Register the Sourcesage MCP server in PolicyLayer and add a rule for register_relationship: 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_relationship? +

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

Can I rate-limit register_relationship? +

Yes. Add a rate_limit block to the register_relationship 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_relationship completely? +

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

register_relationship 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.