paybot_balance

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

With no annotations and no output schema, the description carries the full behavioral burden, and it does disclose the returned fields (limits, trust level, remaining daily budget), which is genuinely useful. However, it never states that this is a non-mutating read, whether it requires authentication, or whether the values are cached/live. Useful but incomplete for a zero-annotation tool.

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?

One front-loaded sentence listing exactly what is checked, with no filler, preamble, or restatement of the tool name. Every clause earns its place.

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 one-optional-parameter read tool with no output schema, disclosing the three returned values is the key missing piece and it is present. The remaining gap is the absence of any safety/profile statement (read-only, no side effects), which would matter more if annotations existed to lean on.

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% and the single botId parameter is fully documented in the schema, including its env-var default. The description adds nothing about the identifier (format, whether it may be omitted), so the baseline 3 for schema-driven params applies.

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 names a specific verb (Check) and enumerates the exact resource set returned: spending limits, trust level, and remaining daily budget, scoped to 'a bot'. That is far more useful than a tautology and distinguishes it from mutation siblings like paybot_set_spending_limit, though it never explicitly names which sibling to pick instead.

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 stated when-to-use context, no prerequisites, and no mention of alternatives such as paybot_health_extended, paybot_history, or paybot_set_spending_limit. The agent must infer that this is a pre-payment status check purely from the tool name.

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