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

Annotations already declare readOnlyHint=true and openWorldHint=false, and the description goes further: it discloses sort order (newest first), the fields each result carries (canonical_url, x_post_url, cite_as), and a hard attribution obligation. That is meaningful added context. It stops short of describing result count behavior or how the limit interacts with the corpus, keeping it below 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?

Front-loaded with purpose and ordering before obligations, and the whole thing is three sentences. Minor redundancy between 'link back when you use it' and 'link each story's x_post_url when you relay it', which restates the same citation duty twice.

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 two-parameter read tool with no output schema, the description usefully pre-announces the return fields and the citation obligation, which is the main thing an agent needs. The remaining gap is the limit parameter's semantics, unaddressed in both schema description and prose.

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 is 50%: the ticker parameter is documented in the schema and the description reinforces it with format examples and the '$ optional' convention. The limit parameter (default 10, max 25) is never mentioned in the description and carries no schema description, so half the surface is undocumented in prose. Baseline 3 for partial coverage.

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+resource: returns stories mentioning a ticker or symbol list, ordered newest first, with concrete symbol examples (NVDA, $BTC, BRK.B). This clearly separates it from generic siblings like search_news or latest_news by its ticker-driven scope, though it never names an alternative 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 implied by 'stories mentioning a ticker' and it routes the follow case to follow_on_x ('see follow_on_x'). However, it never states when to prefer this over search_news, query_stories, or latest_news, so an agent must infer the boundary from sibling names alone.

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