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

Annotations provide idempotentHint=true and destructiveHint=false, and the description adds that it requires an API key and is not guest-callable. However, it does not describe side effects, reversibility, or what happens on success beyond attaching the escrow.

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 jumbled, mixing marketing language ('first taste free'), authentication requirements, and REST details. It is not overly long but could be more organized with clearer separation of purpose, prerequisites, and parameters.

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?

The description mentions prerequisites (opened session, funded escrow, API key) and the REST endpoint, but lacks information about the return value or error cases. Given the simple action and annotations, it is adequate but not comprehensive.

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 only 33% (session_id has a description). The description text clarifies that open_tx_hash is preferred over proof_escrow_id and that one must be provided, but does not explain the meaning or constraints of the optional parameters beyond the schema.

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's purpose: attaching a buyer-funded proof escrow to an opened data session to buy per-query access. It also differentiates from siblings by mentioning the free preview via data_preview and the REST endpoint.

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 implies when to use the tool (after opening a session, to fund access) and mentions that it is not guest-callable and requires an API key. It also contrasts with data_preview for free use, but does not explicitly name alternative tools like data_session_fund.

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