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

There are no annotations, so the description carries the full burden. It does disclose a meaningful side effect: the app 'Auto-publishes' (no draft state), and it states the required api_key and payload signature. However, it does not mention reversibility, what response is returned, or whether this creates a new app or overwrites an existing listing.

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 appropriately ultra-short: one sentence for purpose, one for side effect, and one for requirements. Every sentence earns its place, though the opening 'List an app' is slightly ambiguous.

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 three-parameter tool with full schema coverage, the description is enough to invoke the tool: it names required auth and the signing requirement. However, it omits return-value behavior (there is no output schema) and does not clarify how this operation relates to update_app or get_app, leaving a moderate gap for a write operation with no annotation safety net.

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 coverage is 100%, so the baseline is 3. The phrase 'Requires api_key plus signature of the payload string' adds no meaningful information beyond the schema's existing descriptions and required field markers.

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 the core action ('List an app') and immediately clarifies the outcome ('Auto-publishes'), so an agent can tell this is a publish operation. It does not explicitly distinguish itself from siblings like update_app, and 'List' could briefly be misread as a read operation, but the tool name and 'Auto-publishes' resolve that ambiguity.

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?

No when-to-use guidance or alternatives are given. The only usage-adjacent information is 'Requires api_key plus signature', which is an authentication prerequisite, not a selection criterion or comparison with sibling tools.

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