open_channel

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

With no annotations provided, the description carries the full transparency burden. It discloses the key behavioral trait that funds are blocked for a specific provider and that payments become gas-free, but it omits important operational details such as duration handling, settlement process, and return value, leaving noticeable gaps.

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?

Two sentences: the first names the operation and the second explains the consequence (blocking funds, gas-free payments). No wasted words, and the most important information is front-loaded.

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 gives a reasonable overview of the tool's purpose and immediate effect, but given the lack of output schema and annotations, it misses key context: how the channel is later closed, the role of duration_hours, and what a successful call returns.

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. It only covers provider ('specific provider') and deposit ('on-chain deposit'), while duration_hours is completely unmentioned, and the description provides no units or format for deposit_amount.

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 opens with a specific verb and resource ('Open a high-frequency micro-payment vault channel'), and distinguishes it from siblings by mentioning the on-chain deposit and its connection to consume_channel. This clearly differentiates it from tools like settle_channel and list_channels.

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 clearly positions this as a setup step for high-frequency micro-payments and explicitly references consume_channel as the follow-up action. However, it does not explicitly state when not to use it or mention alternatives like nanopay_deposit, so it just misses the top score.

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