add_expense

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

The description claims the tool is read-only, stateless, and idempotent, but the tool name 'add_expense' implies a side-effecting write operation. This contradiction is a serious transparency issue. The detailed behavioral claims are likely false, and no annotations exist to clarify.

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 lengthy and repetitive, with redundant sections (e.g., 'Behavior' and 'Behavioral Transparency'). The contradictory statements waste space and clarity. A concise description would have focused on the actual function of adding an expense.

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?

Given the tool has 6 parameters with no schema descriptions and a complex purpose (expense recording), the description is highly incomplete. It omits crucial details like how amounts are processed, date format, and return value structure. An output schema exists but is not described, and the description's misleading nature makes it unreliable.

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?

The 'Args' section merely repeats parameter names with the generic suffix 'to analyze or process', adding no meaningful semantics. Schema coverage is 0%, so the description should provide context, but it fails entirely. Parameters like 'budget_month', 'category', and 'amount' are not explained beyond their names.

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 begins by saying 'Record an expense transaction' but then immediately states the tool is read-only and stateless, which directly contradicts the name and the first sentence. This fundamentally misrepresents what the tool does, making it misleading for an AI agent.

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 'When to use' and 'When NOT to use' sections are generic and do not relate to expense recording. They mention structured analysis and real-time decisions, which are irrelevant to the apparent purpose of adding an expense. No guidance is provided on how to use this tool versus siblings like 'add_income'.

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