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

With no annotations, the description does carry the key safety signal itself: 'Writes this snapshot' discloses a state-mutating side effect. But it says nothing about what the write overwrites, whether it is idempotent, whether a permission/credential is required, or what happens when no prior snapshot exists — all material for a write tool with zero annotation coverage.

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?

Each language version is a tight two sentences with the mutation note last, so the phrasing itself is efficient. However, the full text is duplicated in Chinese and English and prefixed with a version tag, which inflates length without adding information an agent can act on.

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 description covers the operation and the three result categories well enough to call the tool, and no output schema exists to explain them further. It is still thin for a write tool with no annotations: preconditions (prior snapshot required), overwrite semantics, and required permissions are all absent.

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 entity, entity_id, and the 7–90 day window including their exclusivity relationship. The description adds no syntax, default, or behavioral detail about any parameter, so the baseline 3 applies.

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 operation: comparing gap types against this site's last snapshot, with the three outcome buckets spelled out (gone / still here / new). It reads clearly against the sibling list, none of which share the snapshot-diff framing, though 'gap type' and 'heal' remain undefined domain jargon.

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?

It states a precondition implicitly (there must be a prior snapshot) but gives no explicit when-to-use guidance, no exclusions, and does not route the agent to or away from any sibling such as intel_availability or intel_signal. Nothing tells the agent when this is the right call versus the other fifteen intel_* tools.

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