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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so safety is covered. The description adds useful context about the specific tax law sections, standard deduction, and rebate thresholds, which goes beyond the annotations. However, it does not disclose any additional behavioral traits such as output format or potential external dependencies.

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 two sentences and front-loads the purpose. It packs specific statutory details efficiently without wasted words. It is slightly dense but remains clear and focused.

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 5 parameters and no output schema. The description explains the computation and mentions the dual-regime comparison, implying the output likely includes both results. However, it does not specify the exact return format or how the as_of_date parameter affects the computation. Given the complexity and lack of output schema, more detail would improve completeness.

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 all parameters are documented in the schema. The description adds context about Chapter VI-A deductions (mapping to 80C/80D) and the dual-regime nature, but it does not add syntax or format details beyond what the schema provides. The baseline of 3 is appropriate when the schema carries the parameter documentation.

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 clearly states the tool computes Indian personal income tax under specific acts and performs a dual-regime comparison. It is specific about the verb and resource, but it does not explicitly differentiate from the sibling 'indian_income_tax' or 'tax_in_new'. The title 'old regime' conflicts with the dual-regime description, but the description itself is unambiguous.

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 no guidance on when to use this tool versus alternatives like 'tax_in_new' or 'indian_income_tax'. It does not state conditions or exclusions, leaving the agent to infer usage from the description alone.

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