Check all URL-sourced documents for updates by comparing Last-Modified headers. Detects when source URLs have been modified since last scrape.
AI agents call check_url_updates to retrieve information from TDZ C64 Knowledge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves HTTP metadata (Last-Modified headers) to determine if source documents have been updated since last ingestion. This is a read-only information retrieval operation with no side effects. Even though it scans multiple documents, it only queries their HTTP properties and reports findings. The worst-case misuse would be discovering outdated knowledge base content, which is low-impact.
From the tool's definition The tool performs a passive check by comparing Last-Modified headers from URL sources. It detects changes ("comparing Last-Modified headers", "when source URLs have been modified") without modifying, executing code, deleting data, or moving money.
Attacks that exploit this kind of access
Check all URL-sourced documents for updates by comparing Last-Modified headers. Detects when source URLs have been modified since last scrape. It is categorised as a Read tool in the TDZ C64 Knowledge MCP Server, which means it retrieves data without modifying state.
Register the TDZ C64 Knowledge MCP server in PolicyLayer and add a rule for check_url_updates: 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 TDZ C64 Knowledge. Nothing to install.
check_url_updates is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the check_url_updates 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 check_url_updates. 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.
check_url_updates is provided by the TDZ C64 Knowledge MCP server (michaeltroelsen/tdz-c64-knowledge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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