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

Annotations already declare destructiveHint=false, idempotentHint=true and openWorldHint=false, so the bar is lower; the description still adds two things not in the annotations: zero credit consumption / no provider call, and the outcome semantics that an unmatched `id` is not an error. It does not state permission requirements or whether the note is recoverable.

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 with zero filler; the operation is stated first, then cost, then edge-case behavior. Every sentence earns its place.

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?

No output schema exists, and the description covers the key return semantics (no error on unmatched id) plus cost behavior. For a simple 3-parameter removal whose IDs are documented in the schema, this is nearly complete; only auth/permission expectations are unstated.

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 the schema already documents projectId, configId and id (including where to obtain each). The description only adds tolerance semantics for `id` ('succeeds whether or not it matched'), which is implicit in idempotentHint, so baseline 3 is appropriate.

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?

Names a precise verb and resource ('Removes a chart note from a rank tracker's own timeline'), which is unambiguous against siblings such as add_rank_annotation and list_rank_annotations. The 'own timeline' qualifier scopes the resource so an agent cannot confuse it with rank keyword or tag removals.

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?

The 'FREE: database only, no SEO data provider is called and no credits are spent' line gives real decision context (call it without cost concern), but no explicit when-not or named alternative is given. Usage is implied rather than stated.

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