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

With no annotations, the description carries the full burden; it does disclose an auth prerequisite ("需 Key/Requires key") and names the three output fields, which is real value. But it omits whether the call is read-only, whether it is slow/rate-limited, and how the three segments are combined or ordered.

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 content is short, but it is duplicated verbatim in Chinese and English, and the "[v1.6.0]" version tag and the unresolved "≈get_chain" reference are noise. Front-loading the field list is good; the padding is not.

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?

Without an output schema, the brief field enumeration (timeline, delta_days, vs_prior) partially compensates, but it never explains what those fields contain or what the tool returns overall. A dangling comparison to a non-sibling tool leaves the agent without a reliable routing decision.

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% and both parameters carry descriptions (entity, entity_id with the ent_ prefix and a two-of-one-or-both rule), so the schema does the work. The description adds nothing about which identifier to prefer or whether entity_id is more precise – baseline 3.

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?

"全链/Full chain" plus the field list (timeline, delta_days, vs_prior) hints at a chained-intelligence summary, but the resource is never named concretely beyond a metaphor. It also references "≈get_chain", which is not a sibling tool (the closest is intel_chain_master), so the intended differentiation is muddled.

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?

There is no statement of when to call this versus intel_chain_master, intel_brief, or intel_signal. The "requires key" note is a prerequisite, not usage guidance, so the agent must guess.

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