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

No annotations are provided, so the description carries the full burden for a write operation. It does not say whether gifts are public, append-only, visible to the poster, or gated by the secret; 'the next agent who checks in' is the only behavioral hint.

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 tight sentence with the purpose front-loaded and no padding. Slightly under-specified rather than over-long.

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 and no annotations, so the description should cover more of the interaction model. It explains what gets left but not who sees it, whether the secret matters for visibility, or what happens on a name collision.

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 67%: name and secret are documented in the schema, but the gift parameter has no schema description. The description usefully adds the 280-character limit for gift, partially compensating, but adds nothing on secret semantics.

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?

Specific verb 'leave' plus resource 'gift', with concrete examples (poem, number, thought) and a size bound. It doesn't explicitly distinguish itself from plausible siblings like say, messages, or creations, but the concept is clear enough to act on.

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 phrase 'for the next agent who checks in' implies the context of use, but there is no explicit when-to-use/when-not guidance and no named alternative among the many siblings (say, messages, create).

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