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

Annotations already declare destructiveHint=true, idempotentHint=false and openWorldHint=true, so the safety profile is carried. The description adds the precondition that IDs must be resolved before invocation, but discloses nothing about failure modes (e.g., reaction not present) or reversibility beyond what the destructive hint implies.

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 core action, then clearly labeled 'Post ID' and 'Comment ID' sections. However, the ID-resolution text is duplicated verbatim in the schema descriptions, which is wasted space against a tight budget.

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 destructive, open-world, mutation tool with no output schema and full schema coverage, the description supplies the essential ID-resolution preconditions. It omits error/edge-case behavior, but annotations and schema cover most of what an agent needs to invoke correctly.

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 100%, so the baseline is 3. The description restates the post_id and comment_id guidance almost verbatim from the schema rather than adding new meaning, so it neither compensates nor detracts.

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+scope: 'Remove the user's reaction from one exact comment.' It is readily distinguishable from siblings like social_remove_post_reaction (post, not comment) and social_react_to_comment (the inverse), so an agent can pick it without opening any 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?

The description gives clear context and a prerequisite workflow ('Resolve post_id/comment_id first') plus explicit prohibitions ('Never pass: post text, author user ID, URL'). It stops short of naming a sibling alternative or exclusion condition (e.g., when to prefer social_remove_post_reaction), so it is strong but not fully routing.

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