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

Beyond the readOnlyHint/openWorldHint annotations, the description discloses the return shape (every reply, nested included, each carrying parentId for threading) and the cost (1 credit). It stops short of covering pagination, ordering, or limits on deep threads.

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 short sentences, front-loaded with the resource and followed by scope and cost. No filler or restatement of the tool name.

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?

With no output schema, the description usefully characterizes the payload (threaded replies with parentId) and the credit cost for a 3-parameter read tool. The only gap is the undescribed cache_max_age parameter, which neither schema nor description explains.

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 sits at 67%, with url and commentId well documented in the schema itself. The description adds the meaningful constraint that commentId must be a top-level comment, but it says nothing about cache_max_age, the one undocumented parameter.

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 concrete resource and scope: all replies beneath a single top-level comment on a PeerTube video, explicitly including nested replies. That said, it never names the sibling it differs from (peertube_comments), leaving the contrast implied by the 'one top-level comment' framing rather than stated.

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 only implicit: 'under one top-level comment' hints that a comment id from peertube_comments must be obtained first, and the commentId schema text reinforces that chain. There is no explicit when-to-use/when-not statement and no named alternative for fetching whole videos' comment threads.

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