observe_tool_start

SERVEREnhanced Knowledge Graph Memory Server SOURCEdanielsimonjr/memory-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/danielsimonjr-memory-mcp/observe-tool-start.md

WHAT IT DOES

What observe_tool_start does on Enhanced Knowledge Graph Memory Server

AI agents call observe_tool_start to retrieve information from Enhanced Knowledge Graph Memory Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why observe_tool_start is rated Low

Even though observe_tool_start only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs observe_tool_start safely

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

observe_tool_start Allowed

observe_tool_start 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": {
    "observe_tool_start": {}
  }
}

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

The button opens the PolicyLayer dashboard: create your workspace, connect Enhanced Knowledge Graph Memory Server, apply this rule, and every observe_tool_start call is checked against it from then on.

FAQ

Questions about observe_tool_start

What does the observe_tool_start tool do? +

v2.1.0 \u2014 Begin observing a tool call. Returns a callId the caller threads through observe_tool_complete / observe_tool_error / observe_tool_partial / observe_tool_cancel. Emits toolCall:start on the observer EventEmitter. It is categorised as a Read tool in the Enhanced Knowledge Graph Memory Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on observe_tool_start? +

Register the Enhanced Knowledge Graph Memory Server MCP server in PolicyLayer and add a rule for observe_tool_start: 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 Enhanced Knowledge Graph Memory Server. Nothing to install.

What risk level is observe_tool_start? +

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

Can I rate-limit observe_tool_start? +

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

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

observe_tool_start is provided by the Enhanced Knowledge Graph Memory Server MCP server (danielsimonjr/memory-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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