Overview — Cash position

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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the '[READ]' tag is largely redundant. The description adds that the breakdown is cleared vs uncleared for on-budget accounts only, which is genuine behavioral context beyond the annotations, but says nothing about whether plan_id changes scope or about pagination/limits.

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?

Three short sentences, front-loaded with the operation and then the return contents. The '[READ]' prefix is redundant given the readOnlyHint annotation, but otherwise there is no filler.

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?

An output schema exists, so the enumeration of returned values is not strictly necessary and the description needn't explain returns. However, the one input parameter is left unexplained and there is no guidance on when to reach for this tool among the many overview siblings, leaving the definition minimally adequate rather than 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?

One optional parameter (plan_id) with 0% schema description coverage, and the description never mentions it. It does not explain what plan_id selects or what happens when it is omitted (default null), leaving the single parameter's semantics entirely undocumented.

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 verb ('Summarize') and resource ('account balances') and enumerates what it returns (on-budget total, off-budget total, net worth, per-account detail), so the agent knows exactly what this produces. It does not, however, explicitly distinguish itself from near siblings such as overview_balance_identity or overview_budget_snapshot, which is the only thing keeping it from a 5.

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?

There is no statement of when to choose this over the many other overview_* tools (budget_snapshot, month_health, balance_identity). Usage is only implied by the name and the 'cash position' framing. No prerequisites or exclusions are given.

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