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

With no annotations present, the description carries the behavioral burden; it discloses what the tool returns (labeled programs, token/SOL movements, success status, risk flags). This is genuinely informative, though it does not explicitly state read-only behavior or error conditions.

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 sentence with the primary verb and resource front-loaded, followed by a compact list of output categories. Every phrase earns its place; no filler or repetition of schema 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 one-parameter, read-oriented explainer, the description is largely sufficient: it names the required input and the main output facets. However, it omits any mention of error cases (invalid signature, unsupported transaction types) or limitations compared with simulation, so it is not quite fully complete.

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?

The sole parameter signature is already documented in the schema as a Base58 Solana transaction signature, giving 100% schema coverage. The description adds no additional parameter-level context, so the baseline of 3 is appropriate.

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?

Starts with a specific verb ('Explain') and resource ('Solana transaction'), and enumerates the concrete outputs (labeled programs, token/SOL movements, success status, risk flags). This clearly distinguishes it from sibling tools like tx_decode or solana_tx_simulate by emphasizing a human-readable interpretation.

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?

No explicit guidance about when to choose this over closely related siblings such as tx_decode, solana_tx_simulate, or solana_token_risk_scan. The phrase 'plain English' implies it is for human-readable explanations, but no when-to-use or when-not-to-use conditions are stated.

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