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

Goes meaningfully beyond the annotations: idempotentHint=true is already declared, but the description adds the authorization requirement (editor permission, validation.write), the advice to reuse a stable idempotency key, and the recovery behavior of reading back after an interrupted response. It also clarifies that MCP comments anchor to the section while browser selections carry moving document anchors.

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?

Four short sentences, purpose front-loaded, each sentence carrying distinct information (scope, anchor semantics, idempotency guidance, permissions). Slightly dense jargon ('moving document anchors') but no filler.

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?

Because an output schema exists, return values need not be described. The description covers permissions, idempotency, and interruption recovery, which is adequate for a comment-creation mutation, with the notable exception of the unexplained project_id/validation_project_id duality.

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%, so the description carries the full burden for six parameters, yet it only clarifies quote (optional, quoting section text), section, and idempotency_key. The most confusing aspect — the coexistence of project_id and validation_project_id, both with no schema documentation — is left entirely unexplained.

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: starting a shared discussion in a research section, with optional quoting. It is clear this creates a new comment thread rather than replying or resolving, though it never names the sibling tools (validation.reply_comment, validation.resolve_comment) that an agent must choose between.

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?

Provides operational guidance (use a stable idempotency key, read back after an interrupted response) and a prerequisite (requires editor permission and validation.write). However, it gives no when-to-use/when-not guidance relative to reply_comment or resolve_comment, which is the main selection decision an agent faces.

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