get_state_diff_history

Get the change history for a specific entity, showing all recorded state diffs in reverse chronological order.

SERVERNodebench SOURCEnodebench-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-homenshum-nodebench/get-state-diff-history.md

WHAT IT DOES

What get_state_diff_history does on Nodebench

AI agents call get_state_diff_history to retrieve information from Nodebench without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why get_state_diff_history is rated Low

This tool queries and retrieves historical data about state changes for an entity. The verb 'Get' combined with read-only operations (viewing diffs, examining history) and the absence of any modification, creation, or deletion language clearly indicate a Read operation. There are no side effects or irreversible actions.

From the tool's definition Tool description explicitly states it retrieves "change history" and "state diffs" in "reverse chronological order" with no modification or deletion capability mentioned.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_state_diff_history safely

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

get_state_diff_history Allowed

get_state_diff_history is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_state_diff_history": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about get_state_diff_history

What does the get_state_diff_history tool do? +

Get the change history for a specific entity, showing all recorded state diffs in reverse chronological order. It is categorised as a Read tool in the Nodebench MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_state_diff_history? +

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

What risk level is get_state_diff_history? +

get_state_diff_history is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_state_diff_history? +

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

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

get_state_diff_history is provided by the Nodebench MCP server (nodebench-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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