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

The annotations only carry openWorldHint=false and destructiveHint=false, so the description carries the burden of behavioral disclosure. It adds a meaningful concurrency guard: 'publish fails if the content changed since, so you publish the exact version you intend.' It also reveals that the operation returns a public CDN URL, which is material for the client-side fetch use case. No contradiction with annotations was found.

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 sentences with no fluff. Each sentence serves a distinct purpose: the core purpose, an explicit non-use case, and a required-parameter guard with the return value. All information is front-loaded.

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 three-parameter tool with full input schema and an output schema, the description covers the key selection decision, a critical failure condition (hash mismatch), and the return value (public CDN URL). No additional information is essential for an agent to correctly select and invoke this 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 100% with detailed descriptions for all three required parameters, so the baseline is 3. The description largely restates the expected_content_sha256 semantics rather than adding significantly new field-level meaning, though it does reinforce provenance by saying 'from the create/update/get that produced this content.'

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 states a specific verb+resource: 'Publish a datafile to a CDN path you choose, so a page can fetch() it client-side.' This makes the exact use case unmistakable and also distinguishes the operation from server-side binding, setting it apart from the numerous publish_* sibling tools.

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 description gives an explicit when-not: 'Only needed for that client-side fetch — NOT to bind a datafile server-side' and explains the alternative path through an endpoint's @latest datafile ref. It does not name a specific sibling tool like unpublish_datafile, but the contextual guidance is clear and actionable.

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