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

Annotations already declare this is a non-read-only, open-world, non-destructive operation, so the bar is lower, and the description still adds real context: the rate limit of 10 per minute per client and the fact that the hash is returned. It omits that a broadcast is irreversible and what happens on rejection or duplicate submission, which matters for a mutating 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?

Two short sentences, front-loaded with the action, then return behavior, then the rate limit. No filler and nothing that could be cut without losing 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?

For a single-parameter, no-output-schema tool this covers the essentials: what it does, that it returns a hash, how to verify the result, and the throughput ceiling. What is missing is failure semantics and the non-idempotent nature of resubmission, which an agent calling a broadcast endpoint would benefit from knowing.

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?

With one parameter and 100% schema description coverage, the schema already documents 'signed_tx' as a 0x-prefixed signed transaction. The description reinforces that the payload must already be signed but adds no encoding or size detail beyond the schema, so baseline 3 applies.

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?

Uses a specific verb and resource ('Send a transaction you signed') and names the target network/RPC path, which separates it from the unsigned-building siblings build_buy_tx and build_sell_tx by implication of 'you signed'. It stops short of explicitly naming those siblings as prerequisites, so the differentiation is inferable rather than stated.

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?

It gives one clear follow-up route ('check it with get_tx_status'), which is genuinely useful sequencing guidance. However it never states the precondition that the transaction must first come from a builder tool, nor any when-not condition (e.g. don't resend an already-broadcast tx), leaving usage partly implied.

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