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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered; the description earns credit for disclosing the one dangerous nuance they cannot express — omitting 'dates' silently widens the blast radius to every annotation on the series. It stops short of saying the deletion is permanent/irreversible.

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?

A single sentence with zero filler, front-loading the object of deletion and putting the destructive default at the end where it reads as the caveat.

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, low-complexity tool with no output schema, the description covers scope and the omitted-parameter behavior, which is what an agent needs to invoke it correctly. The only real hole is the date string format, a minor gap at this complexity level.

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 only 50% ('series' documented as merely 'name', 'dates' undocumented), so the description does carry real weight by explaining the omit-dates default. But it never states the expected date string format for the dates array, which is the main ambiguity an agent would hit.

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 ('Delete annotations of a series') plus the date-based scope, which is far more than the tautological title restates. It implicitly separates itself from add_annotations and list_annotations through the verb, though it never names those siblings.

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 clause 'or all of them if dates is omitted' gives a concrete usage condition for the optional parameter, which is genuinely useful. However, there is no guidance on when to reach for this versus list_annotations/add_annotations or any warning about confirming before a bulk wipe.

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