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

With no annotations, the description discloses behavioral details: FREE cost, owner/editor access, and the overwrite toggle for full replacement. However, it lacks details on error conditions, concurrency behavior (beyond version_id hint), or what happens if overwrite is false on overwrite-shaped batons.

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?

The description is three succinct sentences plus an example, all front-loaded with key information. Every sentence serves a purpose: function, cost/access, and usage example.

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?

Given 6 parameters and no output schema, the description covers core behavior, access, cost, and example. It omits explanations for contentEncoding and contentType, but the overall operation is clear. Completeness is adequate for a straightforward write tool.

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 low (33%). The description adds value by explaining the overwrite parameter's effect and providing an example. However, it does not explain contentEncoding, contentType, or version_id, leaving gaps that the schema only partially fills.

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?

Clearly states the tool writes to a baton, distinguishing between append and overwrite modes. The description explicitly mentions the two presets (append/append-chained and single-object/checkpoint), which differentiates it from sibling tools like read_baton and create_baton.

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?

Provides access requirements ('Owner or editor/write-token only'), cost information ('FREE'), and an example usage. It implies when to use (writing to an existing baton) but does not explicitly state when not to use or compare to alternatives like create_baton.

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