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

Annotations already declare readOnly, idempotent, non-destructive, closed-world, so the safety profile is covered. The description adds value beyond that by disclosing cost behavior ('No credit charge') and by defining the two key counters — generation.mcp_bonus vs available_preparations_now and the UTC reset — which is real semantic context not present in any structured field.

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 sentences, front-loaded with the resource being read before the field-level clarifications. Every sentence carries information, though the phrase 'MCP promotional document allowance' is opaque enough to be near-dead weight for a model unfamiliar with the product vocabulary.

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 no output schema, the description must carry the return shape, and it only partially does: it explains generation.mcp_bonus and available_preparations_now but leaves 'readiness', 'sources' and 'templates' as unelaborated labels whose structures are unknown. Adequate to decide whether to call it, but not sufficient to predict the response payload.

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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The description instead spends its words on return-value semantics, which is the right allocation for a no-arg tool.

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?

Opens with a specific verb+resource: 'Read account readiness, ... credit limits, sources and templates.' That clearly separates it from the job/application-centric siblings, which all deal with postings and applications rather than account state. The only drag is that 'MCP promotional document allowance' and the dotted field names are jargon an agent must infer.

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?

Usage is only implied: the description tells you what the returned fields mean ('free preparations remaining') and that there is 'No credit charge,' which nudges an agent to call it before spending credits on prepare_application. It never explicitly says when to call this versus another sibling, nor states any preconditions or when-not conditions.

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