eu_embed

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

With no annotations, the description carries the full load and does disclose meaningful traits: cost (0.005 USDC), payment rail (Base via x402), and data residency (processed in Germany). It falls short on the ambiguous 'temporary redelivery cache' phrase and says nothing about rate limits or what the response contains. Full behavioral disclosure is not achieved, but the payment and residency facts are genuinely valuable.

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?

It is a single compact sentence with no filler, and the region and cost facts come early. The stacked parentheticals '(paid) (costs 0.005 USDC...)' read as an afterthought rather than structured information.

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 and no annotations, the description should be doing more: it never says what an embedding call returns (dimensions, format) or what the 'redelivery cache' means for repeat calls, leaving the schema's confirmNewPurchase flag to carry the repetition semantics alone. Cost and residency coverage is good; result-shape coverage is absent.

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 description coverage is 100%, so both 'input' and 'confirmNewPurchase' are fully documented in the schema itself and the description adds no parameter-level detail. Baseline 3 applies when the schema does the heavy lifting.

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 identifies the resource clearly ('Text embeddings') and adds a distinguishing qualifier ('processed in Germany'), so an agent can tell it apart from eu_chat and the other EU-region siblings. It never uses a verb, and the trailing 'temporary redelivery cache' clause muddies rather than sharpens the purpose.

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?

There is no when-to-use guidance at all — nothing says when to pick this over eu_chat or eu_llm_info, nor whether the tool is for one-off embedding calls versus batch pipelines. The '(paid)' note hints at a cost tradeoff but never turns into actionable selection criteria.

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