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

Annotations declare the mutation/safety profile (readOnlyHint=false, idempotentHint=false, destructiveHint=false, openWorldHint=false), and the description adds real value beyond them: the reply renders verbatim on the reader's page, matches the web-console reply path, internal threads are visible only to workspace members, and a permission requirement exists. It stops short of covering failure modes or whether replies can later be edited.

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 and scoping facts, but the historical sentence ('Until this existed an agent could read...') is rationale rather than invocation guidance and costs space. Four sentences, mostly earning their place.

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 two-parameter mutation tool with no output schema and annotations already carrying the safety profile, the description supplies everything an agent needs: where to get thread_id, permission limits, visibility semantics, and rendering behavior.

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 both parameters are already documented with descriptions. The description only reinforces that text 'appears verbatim on the page they are looking at' and repeats that thread_id comes from list_feedback; it adds no syntax, format, or constraint detail beyond the schema. Baseline 3 applies.

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+resource ('Write a reply under one feedback thread') and immediately distinguishes itself from the status-changing sibling by noting an agent could previously only 'change its status but could not answer it.' An agent can separate this from list_feedback, set_feedback_status, and send_feedback_to_livepage without opening a schema.

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?

Explicitly routes the agent to list_feedback for the thread_id, states a clear exclusion ('Read-only members cannot call it'), and covers the edge case of internal-visibility threads. The conditions that select this tool versus alternatives are all present.

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