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

With no annotations, the description carries the full burden, and it does disclose one genuine behavior: app_link is null when the app publishes no port, which tells the agent not to treat null as an error. It omits other relevant traits such as whether the app must be running, permission requirements, or what happens for a not-yet-deployed app.

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?

Two tight sentences: the purpose and audience are front-loaded, and the null/edge-case note follows. Every clause earns its place with no redundancy.

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 one-parameter getter with no output schema, the description covers the essential return contract (public URL, or null when no port is published). What is missing is the precondition context — deployment/running state and whether unauthorized callers get an error — but the core is sufficient to call the tool.

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% and the single required parameter managed_app_id is never explained in the description — no format, no source of the id, no relation to sibling tools that also take an app id. The schema name is self-evident, but the description provides no compensation for the documentation gap as required at low coverage.

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?

Specific verb+resource (get the public URL of a deployed managed application) plus the returned field name, so the agent knows exactly what comes back. It is distinguishable from list_apps or get_app_logs by its output, but it never explicitly contrasts itself with the close siblings get_app / get_app_details / get_app_definition, which all target the same app id.

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?

Usage is only implied by the clause 'so it can be shared with the user', which hints this is for surfacing a link to an end user. There is no explicit statement of when to call this instead of get_app_details or get_app, and no stated prerequisites (e.g., app must be deployed/running).

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