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

With no annotations, the description carries the full behavioral burden. It discloses that the digest is stable, uses SHA-256, and requires no account or payment. It does not mention whether content is canonicalized before hashing, whether tool_use_id is included in the digest, or any size or rate limits, but for a simple utility the core behavior is at least surfaced.

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 compact sentence that front-loads what the tool does and adds a brief value proposition. There is no filler, and every phrase contributes either to the tool's function or its access characteristics.

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 is simple and has an output schema, so the return shape does not need to be described. However, with no annotations and no parameter descriptions, an agent may still be uncertain about how tool_name, content, and tool_use_id are used. The use case is clear, but the definition is not fully self-sufficient for correct invocation.

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 0%, and the description provides almost no parameter-level meaning. The mention of 'MCP tool_result' hints that 'content' is the payload being hashed, but tool_name and tool_use_id are not explained at all. The description does not compensate for the schema's lack of field documentation.

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 identifies the tool's function: producing a stable SHA-256 digest of an MCP tool_result for payload verification before payment. The resource and operation are specific enough to distinguish it from generic hashing tools. However, it does not explicitly name or contrast itself with the sibling verify_tool_result_digest, leaving some differentiation to inference.

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 implies the intended use case: agents verify payloads before settling payment. The 'free, no account' note adds an access-related condition. But it never states when not to use this tool or how it relates to verify_tool_result_digest, so an agent must infer the division of labor between producing and verifying a digest.

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