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 covered. The description adds the ID-namespace warning and resolution chain, which is useful, but says nothing about side effects beyond replacement (e.g. whether the prior comment text is unrecoverable) or return behavior.

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?

The core purpose is front-loaded well, but the body is a dense run-on that largely duplicates the schema property descriptions ('post_id and comment_id are different ID namespaces', obtain-with chains, never-pass lists appear in both places). Redundant rather than wasteful, but not tight.

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 moderate-complexity mutation, the hardest part — resolving two distinct ID namespaces — is thoroughly explained, including source tools for each. The gap is return behavior: there is no output schema and the description never indicates what the edit returns or how failures surface.

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 schema already documents all four parameters, including the identical ID-namespace and obtain-with text. The description re-states that same content almost verbatim, so it adds little semantic value beyond the schema. Baseline 3 applies when the schema does the heavy lifting.

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+resource: 'Edit an existing comment.' Combined with the resolution chain, an agent knows exactly what this does and can distinguish it from delete/react/reply siblings by verb. However, it never explicitly names the competing siblings (social_delete_comment, linkedin_reply_to_comment, social_react_to_comment) to sharpen the boundary.

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?

Strong procedural guidance: 'Required chain when starting from human text: resolve post -> post.id -> list comments -> comment.id -> edit,' plus explicit negative instructions ('Never pass: post text, author user ID, URL...'). It stops short of stating when to use edit vs reply_to_comment or resolve_comment, so no explicit alternative routing.

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