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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint, so the safety profile is covered. The description adds substantial behavioral value beyond that: the publication cadence (every 3 minutes), the source provenance, and critically the QUALITY flag semantics (ACT/SUB/NRE) with an explicit warning that SUB and NRE are NOT measurements and must not be reported as such. This prevents a real failure mode where an agent reports substituted or missing telemetry as fact.

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 information-dense with no filler; the core purpose and contents are front-loaded before provenance and quality-flag warnings. It runs slightly long (~110 words), but every clause earns its place — particularly the quality-flag semantics, which are essential for correct use and could not be safely omitted.

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?

With no output schema, the description carries the full burden of conveying what the agent will receive, and it succeeds: it enumerates the measured quantities, units (MW), aggregation (3-minute moving average), and per-value quality flags. The single optional parameter is fully documented in the schema, and annotations cover safety. Nothing an agent needs to call this tool correctly is missing.

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 parameter max_lookback_slots is fully documented in the schema with range, default, meaning, and rationale (publication lag). The description adds no parameter-specific detail, and per the rubric the baseline of 3 applies when the schema carries the full burden.

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 resource (Georgia's national electricity grid), a precise temporal scope ('right now', 3-minute moving average), and enumerates the exact contents (hydro/thermal/wind/solar generation, cross-border flows per tie line, total consumption). This clearly distinguishes it from siblings like gse_grid_at (historical point-in-time) and gse_demand_forecast (future load).

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 phrase 'right now' plus the 3-minute moving average cadence gives clear context that this tool is for the current grid state. However, it never explicitly names alternatives or exclusions, such as pointing to gse_grid_at for historical timestamps or gse_demand_forecast for projections. Clear context, but no explicit when-not-to-use guidance.

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