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

The description adds behavioral context beyond annotations, such as 'operation class read' and the signer boundary note: 'hosted reads/builders never receive keypair bytes; value-moving results must be finalized locally when signing is required.' Annotations only indicate readOnlyHint=false, so the description adds valuable 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?

The description contains useful information but is verbose, especially with repeated SAP MCP execution guidance that appears in both the description and schema. The core purpose is stated early, but extra guidance could be condensed.

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?

Given only one parameter and the presence of an output schema, the description sufficiently covers the validation purpose. It mentions 'checks if a website correctly implements the Solana Actions spec,' which is complete enough for an agent to understand the tool's role.

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 has one parameter (domain) with a description. Schema coverage is 100%, so the description does not need to add much. It does not elaborate on domain format beyond the schema's example. Baseline 3 is appropriate.

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 validates a domain's actions.json file against the Solana Actions spec. It uses specific verb-resource phrasing ('Validate a domain's actions.json file') and differentiates from sibling tools like blinks_buildActionUrl and blinks_getAction by focusing on validation.

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 provides context for when to use this tool: 'for Solana Actions and Blinks metadata fetch, validation, and POST action preparation' and 'preview and validate actions before signing or submitting transactions.' While it does not explicitly state when not to use it, it gives clear situational guidance.

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