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

With no annotations the description carries the full load, and it does disclose the durable-note nature, the content structure it captures, and a genuine authoring constraint (summary must be your own recap, not a transcript). It stays silent on permissions, whether repeated calls overwrite prior handoffs, and side effects, leaving gaps for a mutation tool.

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?

Front-loads the core purpose and stays to three tight sentences. Slight redundancy with the schema on the summary/transcript point keeps it from being fully waste-free.

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 3-param write tool with full schema coverage and no output schema, the description covers purpose, timing, and content well. Remaining gaps (return value, permission needs, idempotency) are minor but real.

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% and the schema already documents summary and links in detail, so the baseline is 3. The description largely restates the schema's guidance (authored recap, PR/issue/branch links) rather than adding new syntax or format meaning.

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 (save) and resource (session handoff / durable note on the board), and enumerates exactly what it records: done, next, blocked, and links. An agent can cleanly separate it from generic siblings like add_comment or create_task.

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 strong positive timing cues ('Call this at the END of a working session') plus concrete trigger phrases ('remember where we left off', 'save our progress'). It does not name an explicit alternative or a when-not condition, so it falls just short of the 5 bar.

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