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

Goes well beyond the annotations: it discloses that comments are attributed to the integration's agent bot user (not a human owner), that the activity feed shows the agent name/mark, and that entries are tagged with the runtime via externalSource for audit. That is exactly the kind of side-effect provenance an agent cannot get from readOnlyHint/destructiveHint alone. Missing only what happens on failure or what the response contains.

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?

Front-loaded with the action, then usage, then the threading parameter, then attribution behavior — each sentence carries distinct information. Slightly over-condensed in the final clause ('shows the agent name and mark'), and the parentId sentence partly restates the schema.

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?

With no output schema, the one real gap is that the description never says the response returns the created comment (and its id), which an agent needs to chain threaded replies. Otherwise complete for a 4-parameter mutation whose annotations already declare the safety profile.

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 50% (content and entityType are undocumented in-schema). The description explains parentId's threading behavior and frames content's purpose, but adds nothing about the 16,000-character limit, the ORB-526 ticket-key form of entityId, or the process/defect entity types, so it only partially compensates.

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?

States a specific verb and resource ('Post a comment') and names the target entities, which distinguishes it cleanly from update_comment, delete_comment and list_comments. It is slightly incomplete: the schema's entityType enum also allows 'process' and 'defect', which the description never mentions, so an agent reading only prose may not realize those targets exist.

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 to record progress, ask questions, or flag blockers' gives intent-level context for the content, but never says when to prefer update_comment or toggle_reaction over creating a new comment, nor any prerequisites (e.g. write access to the entity). Usage is implied rather than prescribed.

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