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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint=false and destructiveHint=false, so the safety profile is covered. The description adds genuine value beyond that: the exact corpus searched (Colin Wynd's articles on tarvit.com), the ranking rule (relevance), and the per-result payload (passage and URL). It does not mention rate limits, result caps, or pagination, which keeps it short of a 5.

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?

Two sentences, front-loaded with scope and followed by return shape; every clause carries information and nothing is repeated from the name or title.

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 one-parameter read-only search tool with full annotation coverage and no output schema, the description supplies corpus, ranking, and return fields, which is enough to call it correctly. Only the result-set size and pagination behavior are left unaddressed.

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?

With a single parameter and 100% schema description coverage, the schema already carries the parameter meaning. The description adds only the notion of keyword matching, not query syntax (phrases, boolean operators, the 200-character cap), so it sits at the baseline.

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: "Keyword search across the full text of Colin Wynd's articles on tarvit.com." The full-text keyword scope plus the relevance-ranked result shape distinguishes it from a plain listing tool like list_writing, though no sibling is named explicitly.

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 implied by "keyword search" and "Words to search for"; there is no explicit statement of when to prefer this over get_article for a known title or list_writing for browsing. No exclusions or prerequisites are given.

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