hash_sha256

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

With no annotations provided, the description must fully inform the agent about behaviors. However, it only states the basic function without disclosing any behavioral traits such as output format, determinism, side effects, or the impact of the 'usedforsecurity' parameter. This is insufficient for informed invocation.

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 extremely concise (three words), which is under-specification rather than effective conciseness. It lacks essential detail and does not front-load key information for tool selection or parameter handling.

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 presence of an output schema (not shown) and simple function, the description is still too sparse. It does not explain return values, error states, or the significance of 'usedforsecurity'. The context of sibling hash tools underscores the need for differentiation, which 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 description coverage is 0%, so the description should explain parameter meanings. It does not: 'data' is untyped beyond being a string (e.g., encoding unclear), and 'usedforsecurity' has no explanation of its effect (e.g., FIPS compliance). The agent cannot infer correct usage from the description alone.

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 'Compute SHA256 hash' clearly states the verb (compute) and the specific resource (SHA256 hash), which distinguishes it from sibling tools like hash_sha1 or hash_md5. The name itself is also highly descriptive.

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?

No usage guidelines are provided. There is no mention of when to use SHA256 versus other hash algorithms (e.g., for security vs. non-security purposes), despite the 'usedforsecurity' parameter hinting at such considerations. The agent is left without direction on tool selection.

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