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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds genuinely new context the annotations lack: entries are ordered newest first and results are paginated. It still omits whether the cursor is opaque, how page size behaves, and what fields each entry carries.

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 compact sentence with zero filler, and the resource is front-loaded before the behavioral details. Sizing is appropriate for a simple list operation.

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 three-parameter tool with no output schema and only 33% schema coverage, the description should say more about what an entry looks like (amount, balance impact, timestamp) and how paging terminates. As written, an agent knows the shape of the list but not its contents or pagination contract.

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 coverage is 33% - only businessId is documented in the schema, and the description doesn't mention it either. The word 'paginated' partially compensates by implying cursor semantics, but limit (default 50, max 100) and cursor are left entirely to the schema. Below the high-coverage baseline, so only partial credit.

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?

States a specific resource (wallet ledger entries) with concrete content types (top-ups, call charges, rentals) plus ordering and pagination. It is distinguishable from ringkit_get_wallet (balance) and ringkit_list_calls (call records), though it never names those siblings explicitly.

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?

Usage is implied: an agent can infer this is the tool for retrieving transaction history rather than current balance. However, with 48 siblings including get_wallet and list_calls, no explicit when-to-use or when-not-to-use guidance is given, and no alternative is routed to.

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