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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds 'chain-wide Explorer DB' for scope context but does not disclose additional behavioral traits beyond that. Given the robust annotations, the description adds marginal value.

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 extremely concise: two sentences that front-load the purpose and immediately follow with usage guidance. Every sentence earns its place with no wasted words.

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 6 parameters and an output schema (not shown but present). The description does not explain return values, but that is acceptable given the output schema. It covers the core behavior (account lookup, direction scope) sufficient for an agent to understand its role among many sibling tools. Slightly more detail on parameters could elevate it, but it is adequate.

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 baseline is 3. The description does not add any parameter-specific meaning beyond what the schema already provides (e.g., no explanation of 'direction' enum or 'windowHours'). The schema carries the full burden, and the description adds no extra semantic value.

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 explicitly states 'Read-only chain-wide Explorer DB transaction lookup for one account as sender, recipient, or both.' It includes a specific verb ('lookup'), resource ('transactions for one account'), and scope ('chain-wide' and 'as sender, recipient, or both'), clearly distinguishing it from sibling tools like get_block_transactions.

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 provides clear guidance: 'Use this instead of XDaLa session tools for account-wide transaction history.' It names an alternative (XDaLa session tools) and specifies the context (account-wide history). Could be more explicit about when not to use, but sufficiently directs the agent.

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