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

The description discloses important runtime behaviors beyond the annotations: that re-using a name creates a new immutable version, that omitting the name yields a random one, and that inlining large content streams through the model and times out. Annotations only declare readOnlyHint=false and destructiveHint=false, so these additions materially help an agent predict side effects and failure modes.

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 longer than average, but each sentence contributes: purpose, versioning behavior, random-name behavior, size threshold, shell alternative, why (timeout). It is front-loaded with the core action and uses no fluff, though it could be slightly tighter by trimming the inline 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?

The tool has an output schema, so return-value documentation is not required in the description. The description covers the essential operational constraints (size limits, alternatives, auth token for the fallback command) and the schema covers parameters and cross-file linking rules. Nothing needed for correct invocation 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 coverage is 100%, so the baseline is 3; the description adds extra meaning on top by explaining name-versioning semantics and the ~10KB practical limit for inline content, which the schema does not convey. It doesn't repeat every parameter, but the schema already covers files, content_type, visibility, and language in detail, so the incremental description value justifies a 4.

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 first sentence states a specific verb and resource: 'Create a document and return its public URL.' It also describes key behavioral facets (versioning on name reuse, random name generation), which makes the tool's function unmistakable against siblings get_doc and search_docs.

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 explicitly tells the agent when NOT to use this tool ('content larger than ~10KB or any file already on disk, do NOT inline it here') and names a concrete alternative ('run `docbin push <file>` in your shell instead'), including the required DOCBIN_TOKEN setup. This is stronger than the typical 'use when...' guidance; it gives an exclusion plus a fallback.

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