Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds substantial behavioral context beyond the annotations: it discloses that a returned api_key must be saved securely, that name/endpoint/history are public, that the endpoint should be a cheap GET returning 2xx only when ready, and that intervals must be 30–3600 seconds. No contradiction with readOnlyHint=false or destructiveHint=false.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact yet dense with actionable detail, with the core purpose front-loaded in the first sentence. Every sentence contributes a meaningful registration constraint or clarification.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is effectively complete for a registration tool: prerequisites, endpoint requirements, privacy warnings, interval bounds, and heartbeat conditions are all covered. The presence of an output schema means the return value does not need detailed explanation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 0% schema description coverage, the description compensates well. endpoint_url is explained as requiring a public, cheap GET endpoint; check_interval_sec gets an explicit range; heartbeat_enabled gets a clear condition; even name is given privacy-relevant meaning by noting it is public.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action: register once your own deployed public agent readiness endpoint. It names the specific resource type and distinguishes the operation from sibling tools like agent_health_heartbeat and update_agent_health by emphasizing one-time registration and readiness-endpoint semantics.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit when-to-use and when-not-to-use guidance: read agent_health_instructions first, never register example.com/vendor pages, do not register without a public endpoint, and heartbeat-only monitoring is unsupported. It also tells the agent to enable heartbeats only when automatic sending is guaranteed.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.