Get one SlimSnap capture by id

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

With annotations already marking readOnlyHint=true, the description adds useful context about the return shape ('same shape as get_latest_capture') and the data source for ids. It does not disclose potential error behavior (e.g., not found) but is acceptable for a simple read operation.

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?

Two concise sentences with no redundant information. Each clause serves a purpose: what it returns, how the output relates to other tools, and where to find ids.

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 single-parameter retrieval tool with readOnly annotation and no output schema, the description is complete. It covers the input source, output shape, and relationship to sibling tools, leaving no critical gaps for an agent to invoke it correctly.

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 coverage is 100% with a clear description for the only parameter. The tool description adds 'Get ids from list_captures' which reinforces schema info, but does not add meaningful new semantics beyond what the schema already provides, matching the baseline for high coverage.

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?

Description states a specific verb ('Returns') and resource ('one specific capture'), with scope also indicated ('by id'). It explicitly differentiates from siblings by mentioning get_latest_capture and list_captures, making its unique purpose clear.

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?

Provides clear usage context by referencing list_captures for obtaining ids and comparing its output shape to get_latest_capture. It implies when to use this tool (to fetch a known capture) but does not explicitly state when not to use alternatives, so a point off for lacking explicit exclusions.

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