trace_state_patch

Apply an RFC 7396 JSON Merge Patch to update state atomically. Validates schema and increments version. Returns compact status.

SERVERTrace SOURCEnikolai-vysotskyi/trace-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/nikolai-vysotskyi-trace-mcp/trace-state-patch.md

WHAT IT DOES

What trace_state_patch does on Trace

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

RISK

Why trace_state_patch is rated Medium

Modifies state reversibly with schema validation; atomic update reduces risk but affects application state.

From the tool's definition Apply RFC 7396 JSON Merge Patch to update state atomically

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs trace_state_patch safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Trace, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For trace_state_patch, this is the rule to start with:

trace_state_patch Rate-limited

trace_state_patch 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": {
    "trace_state_patch": {
      "limits": [
        {
          "counter": "trace_state_patch_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Trace, apply this rule, and every trace_state_patch call is checked against it from then on.

FAQ

Questions about trace_state_patch

What does the trace_state_patch tool do? +

Apply an RFC 7396 JSON Merge Patch to update state atomically. Validates schema and increments version. Returns compact status. It is categorised as a Write tool in the Trace MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on trace_state_patch? +

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

What risk level is trace_state_patch? +

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

Can I rate-limit trace_state_patch? +

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

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

trace_state_patch is provided by the Trace MCP server (nikolai-vysotskyi/trace-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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