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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds the failure return shape ({success:false, message}) which is useful, but does not disclose other behaviors such as error handling, rate limits, or any nuances of the packet lookup. It doesn't contradict annotations.

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 description is two sentences, front-loaded with the primary action and outcome. Every sentence earns its place, with no fluff or redundant 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 simple read tool with fair annotations, the description explains the core function and success/failure response. However, it omits the required chainId and txHash parameters and how they relate to conn_sn, which is important for correct invocation. Since there is no output schema, a bit more detail about the returned packet structure would improve completeness, but it's adequate overall.

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 schema already provides detailed meaning for all four parameters. The description's mention of conn_sn adds no new semantic value beyond the schema. There is a notable inconsistency: the description of connSn says 'REQUIRED' but the schema required list only includes chainId and txHash, which could confuse agents about mandatory parameters.

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 uses a specific verb ('Fetch') and clearly identifies the resource ('a single relay packet') and the selection key ('connection serial number'). It distinguishes from the sibling tool sodax_relay_get_transaction_packets by being singular, and mentions the return shape, making the purpose unambiguous.

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 implies that only conn_sn is needed to fetch a packet, but the schema lists chainId and txHash as required. This is misleading and provides no explicit guidance on when to use this tool versus sodax_relay_get_transaction_packets. There are no exclusions or alternative recommendations.

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