replay_tag

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

The annotations already signal a mutating, idempotent, non-destructive operation. The description adds the basic operations—set name, add/remove tags—and the default session, though the default is also present in the input schema. It does not explain edge behaviors such as name overwrites or conflicting tag operations, but for this simple tool the combination is adequate.

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 short sentences deliver the purpose, the allowed operations, and the default scope without filler. It is front-loaded and every clause is informative.

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?

For a tool with four optional, fully schema-documented parameters and no output schema, this is nearly complete. A note about what the tool returns would be nice, but the description already contains enough for correct invocation and safe use.

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?

The input schema fully describes all four parameters with 100% coverage, and the description maps them transparently to 'name' and 'tags'. The description adds little beyond the schema, so the baseline score of 3 is appropriate.

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 identifies a specific operation—name or tag a session—with clear verbs 'Name'/'Sets' and the object 'session'. It unambiguously distinguishes this from sibling tools like replay_checkpoint, replay_resume, and replay_search, which address different session concerns.

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 'for later retrieval' conveys a concrete use case, and the action scope is clear: name and/or tag a session, defaulting to the most recent. It does not explicitly exclude or mention alternatives, but the context is strong enough for an agent to select this tool appropriately.

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