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

Annotations already declare readOnlyHint=true and idempotentHint=true. The description adds significant behavioral context: it returns commands/directories without modifying files, states pricing as free, clarifies the signer boundary (hosted never sees keypair bytes), and explains routing. This goes well beyond annotations, fully disclosing behavior.

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 somewhat verbose, containing repeated boilerplate (SAP MCP execution guidance appears both in description and input schema). It is front-loaded with the core purpose, but the redundant text could be trimmed for better conciseness.

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 the tool has rich annotations, full schema coverage, and an output schema, the description provides adequate context: it covers both hosted and local modes, security boundaries, and pricing. It is complete for an agent to decide when and how to invoke, though a brief note on error handling or examples might enhance it.

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 includes descriptions. The description adds value by clarifying that 'agent' selects default skill directory, 'skills' is optional subset, and 'targetDir' is optional explicit directory. It also warns to use exact field names and avoid private keys, which aids agent understanding.

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 it returns 'exact latest-release commands and target directories for upgrading SAP MCP skills' and distinguishes itself from sap_skills_install by noting that local mode can then use that tool. This specificity and differentiation make the purpose unmistakable.

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 explains when to use (for upgrading skills), mentions hosted vs local mode, and includes pricing and routing guidance ('call directly without x402'). It implicitly contrasts with installation by saying 'local mode can then use sap_skills_install'. However, it lacks explicit when-not-to-use guidance, leaving a small gap.

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