update_relation · DevFlow MCP: Risk & Policy

WHAT IT DOES

What update_relation does on DevFlow MCP

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

WHY IT NEEDS A POLICY

Why update_relation needs a policy

update_relation modifies existing relation records in the SQLite knowledge graph, which is a write operation with side effects but no permanent loss (relations can be re-edited or restored). It lacks the irreversibility of Destructive operations and does not execute arbitrary code or trigger financial transactions.

From the tool's definition Tool description explicitly states 'Update an existing relation with enhanced properties' — a reversible modification operation on stored data in the knowledge graph. The verb 'update' is characteristic of Write category tools.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_relation Rate-limited

update_relation 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": {
    "update_relation": {
      "limits": [
        {
          "counter": "update_relation_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 DevFlow MCP, so you can run agents against it safely.

FAQ

Questions about update_relation

What does the update_relation tool do? +

Update an existing relation with enhanced properties in your DevFlow MCP knowledge graph memory. It is categorised as a Write tool in the DevFlow MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_relation? +

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

What risk level is update_relation? +

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

Can I rate-limit update_relation? +

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

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

update_relation is provided by the DevFlow MCP server (takin-profit/devflow-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.