agent_checkin

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

No annotations, so the description carries the full burden. It never says what the announcement causes on the mesh (registry entry, broadcast to other agents, visibility), whether it is idempotent, or whether re-checkin overwrites a previous registration — all material for a mutating, externally visible call.

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?

A single well-formed sentence with the key noun 'mesh' and the payload front-loaded. Slightly more structure (a line on what the checkin does) would earn a 5, but nothing is padded.

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?

For a zero-parameter, no-annotation, no-output-schema tool the description is nearly adequate, but it omits the source of the role/repo/capabilities values and any sense of what the call returns or what changes on the mesh after it succeeds.

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?

Zero parameters would normally give a baseline 4, but the description names role, repo, and capabilities as if they were inputs while the schema has no properties at all. That mismatch leaves the agent guessing whether these values come from session context or must be supplied, which actively detracts from clarity.

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?

States a specific verb and resource ('Announces this agent session to the mesh') and enumerates the payload conceptually (role, repo, capabilities), which separates it from siblings like agent_mesh_create and agent_mesh_join. It does not explicitly name an alternative, so it stops short of a 5.

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?

There is no when-to-use or when-not-to-use guidance, no prerequisite (e.g. must join the mesh first), and no mention of agent_mesh_join/create/status as neighboring alternatives. The agent must infer the call ordering from the sibling list alone.

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