Build gRPC frames

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It adds 'deterministic' which implies consistent output, but it does not reveal side effects, error behavior, compression handling, or what happens with invalid input. The schema shows fields like compressed and isTrailer, but the description does not explain their impact on the output.

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 a single sentence that immediately states the core functionality. It avoids redundancy and is appropriately sized for the tool's apparent simplicity.

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 the absence of annotations, output schema, and parameter descriptions, the description is under-specified. It does not explain the structure of the messages array, how payload encoding works, or how outputEncoding affects the result. An agent would need additional context to invoke this tool correctly for varied use cases.

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?

The description has 0% schema coverage and does not mention any parameters. It does not clarify the purpose of 'messages', 'outputEncoding', or the payload fields. The schema defines types and defaults, but the description adds no semantic value to help an agent select or fill parameters correctly.

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 clearly states the tool builds deterministic gRPC or gRPC-Web length-prefixed messages. It uses a specific verb ('build') and resource ('length-prefixed messages'), and it distinguishes itself from the sibling tool 'grpc_frame_parse' by focusing on construction rather than parsing.

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 provides no guidance on when to use this tool versus alternatives such as grpc_frame_parse or binary_encode. It does not mention exclusions, prerequisites, or scenarios where this tool is preferred, leaving the user to infer usage from the name alone.

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