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

No annotations exist, so the description carries the full burden. It discloses one trait — 'Query discarded' — which matches the schema's 'discarded after the length check,' but it says nothing about what the tool returns, whether the url/feed/host inputs trigger network requests, or whether the operation is read-only.

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?

Ten words with no filler; the purpose sentence is front-loaded and the discard note is a genuine behavioral addition. The description is efficient, though it could productively use more space given the schema's complexity.

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 annotations and no output schema, the description must carry the full context, and two sentences cannot do so for a 9-parameter tool. It omits the return value, the required inputs, and the reason the eight unrelated parameters exist, leaving an agent confused about how to call it 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 per baseline the description need not restate parameter meaning. It adds only the 'search query' framing, which helps map intent to the `query` field but leaves the role of the other eight parameters 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?

The description states a specific action — counting characters in a search query — so the core purpose is discernible. However, it never ties 'search query' to the `query` parameter among nine unrelated inputs, and it doesn't differentiate this from sibling count tools like memory-key-count or hn-front-count.

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?

There is no guidance about when to use this tool, which of the nine parameters to supply, or when a sibling would be preferable. The two-sentence description leaves the agent to guess the invocation context entirely.

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