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

With no annotations, the description carries full behavioral burden. It does disclose two useful traits: validity is checked against the whole blockchain (not ownership-restricted) and success returns balances of crypto and digital assets. It says nothing about failure behavior, auth requirements beyond naming an api_key, rate limits, or whether any state changes occur.

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 opening sentence is duplicated verbatim, and '@return: a json object' is pure filler. The JSDoc-style param tags are functional but the redundancy and a no-information return line dilute an otherwise short description.

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?

For a 3-required-parameter tool with no annotations, no output schema, and 0% schema coverage, the description is underpowered. It never explains where blockchain_fk values come from, what the caller should do on an invalid address, or the shape of the returned balance object, which no other structured field supplies.

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 0%, so the description must compensate, and it partly does by glossing all three @param entries. However the glosses are thin and partly circular — 'blockchain_fk: The blockchain_fk of the supported blockchain' explains nothing about format or where to obtain valid IDs (e.g., via crypto_blockchains), leaving the most opaque required parameter effectively undocumented.

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 states a specific verb and resource: verifying that a blockchain address is valid for a given blockchain. That is clear enough for an agent to know the operation, but it never distinguishes itself from near siblings such as crypto_balance, crypto_info, or wallet_verify, so selection still requires inference.

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 whether to call this before a send, how it differs from crypto_balance or wallet_verify, or what a failure means. The closest thing to guidance is the incidental note that the address can be any address on that blockchain, which is a constraint, not a routing rule.

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