agent_state_update_state · Agent State MCP Server MCP

WHAT IT DOES

What agent_state_update_state does on Agent State MCP Server

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

WHY IT NEEDS A POLICY

Why agent_state_update_state needs a policy

This tool modifies stored state data by overwriting the state file. It is a Write operation because the action is reversible (the previous state could be restored from logs or backups). The severity is medium because corrupting agent state could disrupt agent functionality and decision-making, but the impact is limited to internal state rather than external systems or data destruction.

From the tool's definition Tool description states it will 'Update the agent state file, replacing its contents.' The verb 'replacing' indicates reversible modification of an existing data structure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

agent_state_update_state Rate-limited

agent_state_update_state 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": {
    "agent_state_update_state": {
      "limits": [
        {
          "counter": "agent_state_update_state_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 Agent State MCP Server, so you can run agents against it safely.

FAQ

Questions about agent_state_update_state

What does the agent_state_update_state tool do? +

Update the agent state file, replacing its contents. It is categorised as a Write tool in the Agent State MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on agent_state_update_state? +

Register the Agent State MCP Server MCP server in PolicyLayer and add a rule for agent_state_update_state: 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 Agent State MCP Server. Nothing to install.

What risk level is agent_state_update_state? +

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

Can I rate-limit agent_state_update_state? +

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

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

agent_state_update_state is provided by the Agent State MCP Server MCP server (tianhuil/agent-state). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.