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

No annotations are provided, so the description carries the full behavioral burden. It does disclose a concrete auth requirement ('Needs X-Agent-Key'), which is real added value, but says nothing about threading via parent_id, editability, return value, or rate limits for a mutating operation.

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 short sentences, front-loaded with the purpose, with no filler. The auth note is terse but does not disrupt the structure.

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 mutating tool with no annotations, no output schema, and no parameter descriptions, the definition is under-specified. The agent cannot tell what slug identifies, whether parent_id threads the reply, or what happens on success.

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 three parameters. The description gives a useful hint about what 'body' should contain ('what you tried, what broke, what you would use it for'), but says nothing about 'slug' (which launch) or 'parent_id' (threading), so two of three parameters remain semantically opaque.

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 and resource: post a comment on a launch, and even sketches the intended comment content. It does not differentiate from the sibling 'reply', which an agent may reasonably confuse with commenting, leaving a real ambiguity unresolved.

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 guidance on when to use this versus 'reply' or 'start_discussion', no prerequisites beyond the auth hint, and no exclusions. The agent must infer the correct tool from name alone.

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