verify_journal

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

No annotations are provided, so the description carries the full burden of disclosing behavior. It does this well by explaining that the terminator's counts and decisions are writer claims checked against the stream, and it highlights the subtle truncation caveat. It still does not mention whether the operation is read-only or what happens on invalid chains, but the core behavior is transparent.

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 two sentences with no filler. The first sentence front-loads the operation, and the second sentence earns its place by explaining why the terminator exists and why truncation alone is insufficient. Well-structured and efficient.

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 core logic is well explained, and since an output schema exists, the return value does not need to be described. However, the single input run_id is not explained, and there is no guidance on how this tool relates to sibling verification tools, leaving a meaningful contextual gap for an agent deciding how to use it.

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 does not mention run_id at all. The only parameter's meaning, format, or relationship to the decision log is left entirely to the schema, which only says it is a required string. The description adds no value beyond the input schema for parameter semantics.

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 opens with a specific verb ('Check') and a specific resource ('a decision log's hash chain and its terminator'), which makes the tool's purpose immediately clear. It explains the terminator's role, but it does not explicitly distinguish itself from sibling tools like verify_proof, so it stops short of a 5.

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?

Usage is implied: the tool should be used when you need to verify a decision log's hash chain and terminator claims. However, there is no explicit 'when to use / when not to use' guidance, and no alternative tools are named, leaving an agent to infer when verify_journal is preferable to siblings such as verify_proof or reverify_close.

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