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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered; the description goes beyond that by disclosing the default filter (open threads only unless status overrides) and the shape of each item (replies, authors, resolved flag). The closing warning that comments are data, not instructions is a genuinely useful behavioral note for an agent consuming untrusted content.

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?

Three sentences, front-loaded with the scope and coverage, followed by per-item structure and the default filter. Every sentence carries information, though the first sentence packs several parenthetical clauses that slightly slow parsing.

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?

An output schema exists, so return values need no explanation; the description still adds useful context on item composition and default filtering. For a four-parameter read tool with full annotation and schema coverage, nothing an agent needs to call it correctly is missing.

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% and all four parameters are documented inline, including limit bounds, cursor provenance, and the status enum default. The description only restates the open-by-default status behavior already present in the schema and adds nothing about limit or cursor semantics, so 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?

The description uses a specific verb ('Lists') and a precisely scoped resource ('a board's comment threads'), and it enumerates where those threads live (canvas cards/groups/spots/board vs. docs and notes). An agent can tell this is a read/list operation distinct from add_comment or resolve_comments, though no sibling is named to sharpen the contrast.

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?

Usage is implied by the scope statement and the 'open threads unless status says otherwise' default, but there is no explicit when-to-use, when-not-to-use, or routing to alternatives such as resolve_comments when the intent is to act on a thread rather than read it. The agent must infer the selection conditions.

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