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

With no annotations supplied, the description carries the full load and does reasonably well: it discloses the return shape (counts, kind coverage, change/quiet timeline) and a concrete edge case — an asset id belonging to another account returns not-found. It never explicitly states this is a read-only operation or addresses auth, which keeps it from a 5.

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?

Two sentences, zero filler. The capability summary is front-loaded and the edge-case note follows as a tight trailing caveat. Every clause carries information.

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 convey what comes back — and it does so at the right level of abstraction for a composite read (volume, kind coverage, timeline). The only gap is that it never confirms this is a pure read with no side effects, a small omission for a 2-parameter lookup.

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 100%, so the baseline is 3; the description adds meaning by framing 'limit' in context — it controls the 'recent timeline' of changes and quiet stretches, clarifying what the bounded list actually contains. The asset_id semantics are also reinforced by the not-found note about account scoping.

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 the resource precisely ('One asset in depth') and enumerates the payload conceptually: observation volume, which observation kinds have data, and a recent timeline. It does not explicitly contrast itself with the plane_assets list sibling, leaving that differentiation to the schema's 'Asset id from plane_assets' hint, so it falls short of a 5.

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?

Usage is implied rather than stated: an agent can infer this is the drill-down tool for a single asset id obtained from plane_assets, but there is no explicit 'use this when...' guidance and no mention of plane_events as the alternative for event-level data. Adequate but leaves routing to inference.

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