explain_code_history

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

No annotations are provided, and the description adds zero behavioral information. It does not disclose whether this is a read-only operation, how it retrieves history, what output format to expect, or any side effects. The description carries the full burden for behavioral disclosure and fails entirely.

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 brief, but brevity here is under-specification rather than efficient conciseness. A single phrase that repeats the tool name without elaboration does not earn credit for structure; it fails to convey any substantive information while appearing to be a complete definition.

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 no output schema, no annotations, and a descriptor that is a tautology. Given its sibling tools perform distinct historical/diagnostic functions, an agent cannot determine what inputs are needed, what results to expect, or how this differs from related operations. The definition is completely inadequate.

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 tool accepts 0 parameters, so there is nothing for the description to clarify about argument meanings. Per the baseline for 0-parameter tools, this dimension is not penalized for missing parameter documentation. The description's lack of context does not affect this score.

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 'explain code history' is essentially a restatement of the tool name with a verb and resource, but it provides no actual explanation of what 'explain' means in this context or what 'code history' refers to. It is a tautology, not a clear statement of function.

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?

There is no guidance on when to use this tool versus its siblings like search_past_failures or replay_behavior_case. No context, prerequisites, or situational cues are provided. The agent is left to guess which scenario would call for explaining code history.

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