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

Annotations (readOnlyHint=false, openWorldHint=true, idempotentHint=false) are broad, and the description adds real context: the invocation is free and accountless, usage is recorded in aggregate, and the receipt is single-use for optional later contribution. It doesn't specify failure modes or what happens to the recorded usage, but it meaningfully extends the safety/side-effect picture.

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?

Three sentences, front-loaded with the precondition and then the behavioral outcome and the safety constraint. No filler, though 'declared non-effect, non-binding' is denser jargon than needed.

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 five-parameter, nested-object tool with no output schema, the description covers preconditions, side effects and the return artifact (a receipt), which is reasonable. It still leaves parameter-level guidance and error behavior undocumented, so it is adequate but not complete.

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 0% across five required parameters, including a nested grow_acknowledgement object with const-constrained booleans. The description names no parameter and gives no format, cardinality or content guidance for engine_id, capability_id, payload or request_id, so the schema carries the full burden and the description does not compensate.

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 states a specific verb ('invoke') and resource ('a GROW capability'), plus its runtime behavior (accountless invocation, aggregate usage recording, single-use receipt). It implicitly routes to the discovery/resolution siblings as prerequisites, though the term 'GROW capability' is undefined jargon for an outside agent.

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?

'Use this only after discovery or resolution identifies a declared non-effect, non-binding GROW capability' gives an explicit precondition tied to sibling tools. 'Never send secrets, personal data or binding actions' adds a clear prohibition, though the alternative path (saash_grow_share_experience) is only hinted at via 'optional experience contribution'.

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