memory_session_title

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

The description explicitly claims "Idempotent," but the annotations declare idempotentHint=false. This is a direct textual conflict on a declared behavioral trait, and an agent could be misled into blind retries. The useful context it does add (state mutation, rename semantics, timing) is outweighed by contradicting the structured safety hints.

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, purpose front-loaded, with the rationale for calling it early rather than burying it. Every clause carries information; nothing is redundant padding.

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?

An output schema exists, so return values need not be described, and the annotations cover the safety profile for this narrowly scoped mutation. The description covers when to call and what it affects, but the idempotency statement leaves the mutation/retry semantics muddled rather than fully resolved.

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 baseline is 3, but the description adds meaning the schema omits: it clarifies that omitting `episode` targets this session's own auto-opened episode, whereas the schema leaves the null default's behavior unexplained. That is genuine added value for the optional parameter.

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?

States a specific verb+resource and scope: "Name THIS session's auto-opened episode," and explains the default it replaces ("default titles are generic"). It is clearly separable from siblings like memory_store, memory_message, or memory_episode_start, which do different things.

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?

Gives explicit timing ("Call once at the start of work") and a follow-up case ("call again to rename"), which is real when-to-use guidance. It does not name an alternative sibling or state when not to use it, so it stops short of 5.

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