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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds real value beyond that with the API-key/tier gating (MCP Pass or Firm account required, Consultant/Legend excluded), which an agent needs before attempting the call. Return shape is not described, but an output schema exists.

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?

Three tight sentences, front-loaded with what the profile contains, then the auth gate, then the id provenance. The id provenance sentence duplicates the schema, which is a minor redundancy, but nothing else is wasted.

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?

With an output schema present the description rightly omits return values, and it covers the two things an agent actually needs: how to obtain the id and what auth tier is required. Error or not-found behavior is the only notable omission for a single-resource fetch.

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 schema already states 'Profile id, verbatim from find_sap_clients.rows[].id.' The description repeats that same provenance sentence almost verbatim, so it adds no meaning beyond the structured field. Baseline 3 applies when the schema does the work.

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?

It names a specific verb-and-resource pairing: the full profile of ONE SAP end-customer, and enumerates what the profile contains (footprint, modules, analytics solutions, identity/evidence). The word 'one' plus the pointer to find_sap_clients.rows[].id makes it clearly distinct from the sibling list/search tool.

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?

It gives a clear prerequisite chain — get the id from find_sap_clients, then call this — plus an explicit auth exclusion (Consultant and Legend web plans lack MCP access). It stops short of an explicit 'use find_sap_clients instead when you need to search rather than fetch a known id' statement, so there is a small inference left to the agent.

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