jpeg_structure

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

No annotations are provided, so the description carries the burden. It discloses that the tool outputs offsets, sizes, positions, and segment lengths, which are behavioral details beyond a generic parse. However, it does not mention whether the tool is read-only, required permissions, or any side effects like file modification. For a read-only analysis tool, the description provides moderate transparency.

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 sentences: the first clearly states the action and output components, the second adds context and use case. No wasteful words, information is front-loaded, and every sentence adds value.

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 simple tool with one parameter, no output schema, and no annotations, the description covers the essentials. It explains what the tool outputs (markers, positions, sizes) and why it's useful. Lacks mention of JPEG variants (e.g., JPEG 2000) but is otherwise complete.

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?

Only one parameter (file_path) exists with full schema coverage (100%). The description's 'Path to JPEG file to analyze' matches the schema and adds no extra meaning or constraints (e.g., file size limits, supported paths). Baseline score of 3 is appropriate given complete schema.

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 verb (Parse) and resource (JPEG markers/segments with offsets and sizes). It details the output (internal structure, markers, positions, segment lengths) and use case (identifying hidden data or anomalous segments), distinguishing it from siblings like jpeg_comment or jpeg_dct_histogram.

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?

The description implies use for structural analysis and hidden data detection, but does not explicitly state when to use this tool over alternatives (e.g., jpeg_comment for comment extraction, jpeg_dct_histogram for DCT analysis). No when-not-to-use guidance or prerequisite conditions are provided.

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