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

With no annotations, the description carries the full burden and does disclose notable behavior: it returns two sources side by side with a comparison, defaults to current values, and has licensing constraints (free non-commercial with attribution, Pro for commercial/older dates). It omits read-only/write semantics and any response format or rate-limit detail, but the licensing and dual-source disclosure is genuinely beyond the schema.

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?

Front-loaded with the core purpose, then mode definitions, defaults/history, and licensing in a compact block of sentences. Dense and slightly run-on, but essentially every sentence carries information an agent needs; little waste.

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?

No output schema exists, so the description must cover returns, and it does explain the side-by-side source comparison, which is the key output differentiator. Combined with licensing terms and default/history semantics for a 4-param optional-parameter tool, it is nearly complete; only the exact response fields are unspecified.

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 75%, so the baseline is 3, but the description adds real meaning by defining what each type enum value returns (TDU per-utility PUCT charges vs municipal residential components) and reinforcing default vs history behavior for start/end. The utility parameter values are left entirely to the schema, which is acceptable given its enumerated description.

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+resource — retrieval of utility delivery (TDU) and municipal rate charges with effective dates — and distinguishes the two data modes by the 'type' enum. It is clearly separable from siblings like market_gas_prices or market_wholesale_prices because it names PUCT rate reports and specific utilities (Oncor, Austin Energy, CPS Energy).

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?

Gives explicit mode-selection guidance: type=tdu for PUCT/EFL delivery charges, type=municipal for Austin Energy and CPS Energy residential components, plus default (current values) vs start/end (history). It does not name a sibling alternative to use instead in any scenario, so it stops short of full when/when-not routing.

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