f_set_workspace · Heuristic MCP: Risk & Policy

WHAT IT DOES

What f_set_workspace does on Heuristic

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

WHY IT NEEDS A POLICY

Why f_set_workspace needs a policy

An AI agent can call f_set_workspace faster than any human can review — one bad instruction and it creates or modifies resources in Heuristic by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

f_set_workspace Rate-limited

f_set_workspace 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": {
    "f_set_workspace": {
      "limits": [
        {
          "counter": "f_set_workspace_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 Heuristic, so you can run agents against it safely.

FAQ

Questions about f_set_workspace

What does the f_set_workspace tool do? +

Changes the current workspace path at runtime. This updates the search directory and cache, and optionally triggers a full reindex. Useful for multi-project workflows. It is categorised as a Write tool in the Heuristic MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on f_set_workspace? +

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

What risk level is f_set_workspace? +

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

Can I rate-limit f_set_workspace? +

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

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

f_set_workspace is provided by the Heuristic MCP server (softerist/heuristic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.