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

The annotations already declare read-only, idempotent, non-destructive behavior, and the description adds concrete operational details: no network access, no stored state, deterministic output, and specific limits (64 KB JSON input, 1 s per call, 1 MB result). These details materially help an agent invoke the tool safely and predictably.

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 information is organized with labeled sections and is front-loaded with the purpose. It is somewhat longer than necessary because the Spanish and English versions duplicate the same content, but the structure remains clear and useful.

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 tool has an output schema and rich annotations, so the description need not explain return values or safety basics. It covers the important limits and side effects, though it could be slightly more complete by mentioning Base58Check as a neighboring alternative.

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 100%, so the baseline is 3. The description adds useful input-format context by specifying the Bitcoin Base58 alphabet and names the output encodings, but most parameter meaning is already fully documented in the schema.

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: decode Base58 using the Bitcoin alphabet into hex, UTF-8 text, or base64. It explicitly distinguishes itself from the sibling base58-encode tool, so an agent can identify the operation without opening the schema.

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 an explicit exclusion (not for encoding; use base58-encode) and a general usage context. However, the Spanish/English phrasing 'a esta codificación, o desde ella' / 'to or from this encoding' is slightly ambiguous for a decode-only tool, and it does not mention the related base58check-decode alternative.

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