approve_token

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

No annotations are provided, so the description carries the full behavioral burden. It never states that this is a state-changing on-chain transaction that costs gas, is irreversible, requires a signing wallet, or that the granted allowance can later be spent by the spender — all critical facts for a mutation tool.

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?

A single front-loaded sentence with no wasted words. It is efficient, though the terseness is part of what leaves the behavioral and parameter gaps unfilled.

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 three-parameter write operation with no annotations, no output schema, and only one-third of parameters described, the definition omits far too much: gas/auth requirements, irreversibility, allowance semantics, and the meaning of two parameters.

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%: only 'spender' is documented. The description adds nothing about 'token' (address vs symbol) or 'amount' (why it is a string — base units vs decimal string), so with low coverage it fails to compensate for the schema gap.

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 names a specific verb and resource ('Approve token spending') with a clear scope ('for a contract'), which maps cleanly onto the ERC-20 approve operation. It does not differentiate itself from same-domain siblings like send_tokens, swap_tokens, or deploy_custom_contract, so it stops short of a 5.

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 guidance on when to choose this over send_tokens or swap_tokens, nor any prerequisite (connected wallet, existing token balance, gas availability). The agent must infer that this grants an allowance rather than moving funds.

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