observe_tool_error
v2.1.0 \u2014 Record failure with an error message. No-op on unknown callId.
This record as markdown: /tools/danielsimonjr-memory-mcp/observe-tool-error.md
What observe_tool_error does on Enhanced Knowledge Graph Memory Server
AI agents use observe_tool_error to create or update resources in Enhanced Knowledge Graph Memory Server, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Enhanced Knowledge Graph Memory Server environment.
Why observe_tool_error is rated Medium
The tool writes/records an error event associated with a call ID into the knowledge graph. It creates or modifies data (an error record) but is reversible and limited in blast radius. The 'No-op on unknown callId' clause limits misuse potential. Severity is low since it only logs error metadata and has no destructive capability.
From the tool's definition Record failure with an error message. No-op on unknown callId.
Attacks that exploit this kind of access
The rule that runs observe_tool_error 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_error, this is the rule to start with:
observe_tool_error 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Enhanced Knowledge Graph Memory Server, apply this rule, and every observe_tool_error call is checked against it from then on.
Questions about observe_tool_error
v2.1.0 \u2014 Record failure with an error message. No-op on unknown callId. It is categorised as a Write tool in the Enhanced Knowledge Graph Memory Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Enhanced Knowledge Graph Memory Server MCP server in PolicyLayer and add a rule for observe_tool_error: 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.
observe_tool_error is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the observe_tool_error 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.
Set action: deny in the PolicyLayer policy for observe_tool_error. 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.
observe_tool_error 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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