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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds one non-trivial behavior beyond that: the server retains only bounded metadata plus an attested outcome, which is a real data-handling disclosure. It still omits async/result-retrieval behavior and what the local agent actually does, so it is additive but thin.

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?

It is a single compact sentence, which is appropriately sized for the surface it covers. However the phrasing 'relay execute local action' is grammatically broken and partially duplicates the tool name, and the semicolon clause pushes the useful retention detail behind a redundant restatement.

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?

This is a mutation tool with a nested details object, a multi-ID handoff/session/execution flow, and no output schema, yet the description explains none of that flow or how the agent learns the outcome. For a tool this structurally involved, one sentence of mechanism description is not enough to call it correctly.

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?

Schema description coverage is 100%, so parameter documentation is already carried by the schema and the baseline is 3. The description contributes nothing about projectId, idempotencyKey, or the nested details object, and notably does not correct the schema's copy-pasted 'Owned project ID' text reused for handoffId, sessionId, executionId and status.

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 names a specific actor ('the connected local agent') and a generic action ('execute local action'), but 'relay execute local action' largely restates the tool name rather than explaining what kind of action is being relayed or what triggers it. An agent can infer this is the execution step of the relay family (vs. relay_poll, relay_status, relay_accept), but the description never states that distinction explicitly.

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 guidance and no comparison against the many relay siblings (relay_poll, relay_status, relay_accept, relay_release, relay_sync_completion). The single sentence describes a storage property, not a usage condition, so the agent gets no help deciding when this tool is the right call.

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