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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, but the description adds genuinely non-obvious behavior beyond them: what is destroyed (text and vector), that removal from search is immediate, and that the note's slot in the 500-note lifetime quota stays consumed. It also states the auth model (no API key/account).

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?

Four short, front-loaded sentences that put the action first and the quota caveat before the auth aside; no filler sentences. The 'no API key, no account and no sign up' triplet is slightly redundant for emphasis, keeping it just under a 5.

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 destructive mutation with full annotation coverage, fully documented parameters, and no output schema, the description supplies everything an agent needs: destruction scope, immediate effect, quota persistence, and the auth model. Nothing material is missing.

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% and each parameter documents its own origin (write_token from create_semantic_search, note_id from add_semantic_search_notes or a search). The description only references 'the write token' and adds no syntax or format detail, 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?

The description gives a specific verb (Delete) and resource (one note in a semantic search collection), and 'one note' implicitly contrasts with the plural sibling add_semantic_search_notes. It stops short of naming a sibling or the read/query counterparts, so it is clear but not fully differentiated.

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?

It states you call it 'directly' with no API key, which is a usage precondition, and the singular scope hints at single-note deletion. But there is no explicit when-to-use vs when-not-to-use guidance and no reference to the alternative of leaving notes in place.

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