parse_subtitle

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

The description discloses key behavioral traits: it operates on a local file and explicitly states it does not perform storage ('no storage'). Since annotations are absent, this is valuable context beyond the tool name. It does not mention error cases or environment requirements, but for a simple read-only parser the core trait is covered.

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, front-loaded sentence that captures the core operation, the input format, and the storage behavior. No word is wasted, and it is immediately parseable by an agent.

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?

For a tool with one parameter and an output schema, the description is sufficient to understand the operation and the key constraint (no storage). It lacks usage guidance, but that dimension is covered elsewhere. The presence of an output schema means return values are documented outside the description, so the minimal text is acceptable.

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 input schema provides only a file_path string with no description (0% coverage). The description compensates by specifying that the file must be a local SRT/ITT file, clarifying the accepted format and locality. This gives the agent the necessary semantic for the single parameter.

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 parses a local SRT/ITT file into timed cues. It uses a specific verb ('parse') and resource ('local SRT/ITT file'), and differentiates from siblings by emphasizing 'no storage', which distinguishes it from other subtitle-related tools like localize_subtitles. No ambiguity about what the tool does.

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 explicit guidance on when to use this tool versus alternatives. The description implies usage when a user needs to extract timed cues from subtitle files, and the 'no storage' note suggests it is for ephemeral parsing, but siblings like localize_subtitles or translate are not addressed. A short phrase like 'use for read-only subtitle analysis' would have helped.

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