get_spans

Fetch recent agent spans, optionally filtered by session or run.

SERVERMetis Public Health SOURCEsveritg/metis_ph

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/sveritg-metis-ph/get-spans.md

WHAT IT DOES

What get_spans does on Metis Public Health

AI agents call get_spans to retrieve information from Metis Public Health 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_spans is rated Low

This tool queries and retrieves telemetry or execution trace data (agent spans) from the system with optional filtering. It has no side effects, does not modify data, does not execute code, and does not delete anything. It is purely informational retrieval, fitting the 'Read' category.

From the tool's definition Tool name is 'get_spans' and description states 'Fetch recent agent spans' — 'Fetch' is a read operation that retrieves data without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs get_spans safely

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

get_spans Allowed

get_spans 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_spans": {}
  }
}

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

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

FAQ

Questions about get_spans

What does the get_spans tool do? +

Fetch recent agent spans, optionally filtered by session or run. It is categorised as a Read tool in the Metis Public Health MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_spans? +

Register the Metis Public Health MCP server in PolicyLayer and add a rule for get_spans: 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 Metis Public Health. Nothing to install.

What risk level is get_spans? +

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

Can I rate-limit get_spans? +

Yes. Add a rate_limit block to the get_spans 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_spans completely? +

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

get_spans is provided by the Metis Public Health MCP server (sveritg/metis_ph). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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