cache_mset

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

No annotations provided, so the description fully discloses behavior: uses one TCP round-trip via Redis pipeline, overwrites existing values, partial failure handling with committed keys and per-key error list, and return format. This is comprehensive.

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 concise and well-structured: starts with purpose, then key details, then usage guidance. Every sentence adds value without redundancy.

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?

Given the tool's complexity (multi-key, pipeline, partial failure), the description covers all essential aspects: performance characteristic, overwrite behavior, error handling, and return format. No gaps.

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?

Input schema has 100% coverage, but the description adds value beyond schema by explaining per-key TTL is a differentiator from native MSET and that items overwrite existing values. This provides meaningful context.

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 it sets multiple key-value pairs in one pipeline round-trip with per-key TTL support. It distinguishes itself from siblings (cache_set, cache_stream_set) by its batch operation and per-key TTL capability.

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 explicitly says when to use this tool (multiple keys, per-key TTL) and when to use alternatives (cache_set for single key, cache_stream_set for large streaming payloads), providing clear guidance.

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