write_matrix_entry · Revenue Engine MCP: Risk & Policy

WHAT IT DOES

What write_matrix_entry does on Revenue Engine MCP

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

WHY IT NEEDS A POLICY

Why write_matrix_entry needs a policy

The tool modifies a shared knowledge base by writing or appending entries. While individual write operations are reversible (entries can be edited or deleted), they affect a collaborative document used for business management.

From the tool's definition Tool name contains 'write' and description states 'Write or append entry to Knowledge Matrix.' This is a data modification operation that creates or appends new entries.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

write_matrix_entry Rate-limited

write_matrix_entry 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_matrix_entry": {
      "limits": [
        {
          "counter": "write_matrix_entry_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 Revenue Engine MCP, so you can run agents against it safely.

FAQ

Questions about write_matrix_entry

What does the write_matrix_entry tool do? +

Write or append entry to Knowledge Matrix. Topics: Bugs & Fixes, Features Added, Testing Results, Decisions & Direction, Documentation Updates, Next Session Goals. It is categorised as a Write tool in the Revenue Engine 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 write_matrix_entry? +

Register the Revenue Engine MCP server in PolicyLayer and add a rule for write_matrix_entry: 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 Revenue Engine MCP. Nothing to install.

What risk level is write_matrix_entry? +

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

Can I rate-limit write_matrix_entry? +

Yes. Add a rate_limit block to the write_matrix_entry 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_matrix_entry completely? +

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

write_matrix_entry is provided by the Revenue Engine MCP server (promptishoperations/mcpspec). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.