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

With only readOnly/destructive/idempotent annotations, the description carries heavy behavioral detail: the fingerprint is validated at save time, runs reserve a quote at or below the confirmed high amount, higher quotes skip until re-confirmed, disabled accounts write nothing, overdue periods advance without catch-up, insufficient credits skip the period and email the owner, and it never auto-charges. It also states required permissions (actions.write, Agent Picks, project management rights) — materially beyond the annotations and fully consistent with them.

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 actionable part (cadence first, then the fingerprint precondition) is front-loaded and no sentence is pure filler. However, many distinct rules — credit skips, overdue advance, permissions — are packed into an unstructured run-on block that would read better as separated clauses or bullets.

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 2-parameter mutation with no output schema, the description covers preconditions, side effects, cost behavior, permissions and the off-state, which is most of what an agent needs. It does not say what the call returns or how to verify the saved schedule, so it is not fully complete.

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 0%, so the description must compensate, and it largely does: it explains where the fingerprint comes from ('the current schedule estimate') and that it is checked at save time, and it gives concrete timing semantics for each cadence value (midnight UTC, Monday, first of month). It never defines the fingerprint format (64-hex) or why a stale fingerprint fails beyond 'checked at save time', leaving a small gap.

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 opening ('Set off, daily, weekly or monthly') plus the fingerprint instructions make it clear this configures the recurring cadence for Agent Picks tests, a specific verb+resource. It never explicitly contrasts itself with the read-side sibling devtune_get_agent_picks_schedule or devtune_update_agent_picks_settings, so the agent must infer the boundary from the name.

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?

'For a recurring cadence, pass the fingerprint from the current schedule estimate' effectively routes the agent through the get-schedule tool first, and 'Off stops future tests; cancel an active test in the app' names what this tool does not do. It lacks an explicit when-to-use-vs-siblings statement (e.g. versus update_agent_picks_settings), so it is clear but not exhaustive.

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