get_gb_carbon_intensity

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

With no annotations provided, the description carries the burden of disclosing behavioral traits. It mentions the data source and units but does not discuss authentication, rate limits, update frequency, or any operational nuances. For a read operation, this is a minimal disclosure that leaves the agent guessing about access and reliability.

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 a single, front-loaded sentence that conveys the core resource, units, source, and scope. Every word earns its place, and there is no redundancy or 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?

The tool has no output schema and no annotations, and the description is brief. It covers the general purpose and modes but does not elaborate on return structures, potential limitations, or usage caveats. For a two-parameter tool with a clear enum, it is minimally adequate but leaves gaps for an agent expecting a fully specified contract.

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 the schema already documents both parameters and the action enum. The description adds marginal context by mentioning 'national, regional, or historical' and 'generation mix', but it does not provide any semantics beyond the schema. Baseline 3 is appropriate.

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 that the tool retrieves GB carbon intensity in gCO2/kWh and generation mix from National Grid ESO, and specifies the available scopes (national, regional, historical). This is specific and distinguishes it from sibling tools like get_gb_grid_demand, which focuses on demand.

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 implies usage by outlining the three modes (national, regional, historical), but it does not explicitly state when to use this tool over alternatives or include any exclusions. The enum in the schema covers the selection between actions, but no guidance is given on tool selection among similar data services.

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