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

Annotations already declare readOnly, idempotent, openWorld, so the safety profile is covered; the description adds real behavioral context beyond that: it returns metadata only, requires no proxying, is free and licence-cleared, and imposes an attribution obligation with the exact credit string. It does not mention rate limits, caching of the 'latest available date', or what happens if the catalog source is down.

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 usage condition is front-loaded and the catalog contents are listed compactly. The attribution and licensing block, while long, carries compliance-relevant information rather than filler, though 'Free. License: cleared.' plus the full NASA/NOAA credit string makes it heavier than the tool's trivial one-parameter surface warrants.

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?

There is no output schema, so the description must characterize returns - and it does, naming layer id, tile URL templates, latest available date, licence and credit, plus who actually serves the tiles. It lacks only the no-argument behavior and any hint about catalog freshness or update cadence, which are minor for a one-parameter read-only lookup.

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% and the single enum parameter already documents the five layer ids, so the baseline is 3. The description adds family-level meaning (VIIRS/HLS vs GOES/global IR) but never says what happens when the optional 'id' is omitted - whether all layers are returned or a default is chosen - which is the one parameter question left open.

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 states a specific resource (a metadata catalog of NASA GIBS VIIRS/HLS and NOAA nowCOAST GOES/global IR tile layers) and enumerates what it returns: layer id, tile URL templates, latest date, licence and credit. It clearly distinguishes itself from image-serving tools by saying 'No proxied imagery', and the layer families named map onto sibling tools like get_satellite_elements. It stops short of naming any sibling tool explicitly, so it is clear but not sibling-differentiating.

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?

'Use this when you need a metadata catalog for ...' gives a clear selection context, and 'No proxied imagery. ... clients fetch tiles directly from NASA/NOAA' sets a genuine boundary: this is not an image fetch. There is no explicit when-not or named alternative (e.g. get_satellite_elements, get_worldcams), so routing is implied rather than prescribed.

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