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

Annotations already declare idempotentHint=true, destructiveHint=false and openWorld=false, so the safety profile is covered; the description adds genuine context beyond that with merge semantics ('only fields provided are updated') and the fact that writes land in the cache rather than the live Power Automate API. It does not explain how a field is cleared or what the response contains.

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 tightly written sentences with the plan requirement and target resource front-loaded and the merge/cache behavior appended. No filler, though the bracketed plan notice interrupts the leading purpose statement slightly.

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 an 18-parameter mutation tool with no output schema and low schema coverage, the description covers the safety and merge semantics well but omits clearing/removal semantics, tag overwrite vs append behavior, and return value. Adequate but with clear 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?

With 18 parameters and only 33% schema description coverage, the schema leaves most fields undocumented (tier, security, critical, businessValue, businessJustification, supportEmail, supportGroup, ownerBusinessUnit). The description names a handful of updatable concepts and clarifies merge behavior, but does not explain what the undocumented fields mean or their expected value formats.

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 (update) plus the resource and the narrow field category (governance/metadata fields on a flow record in the Power Clarity store). The 'store' qualifier implicitly separates it from update_live_flow, but no sibling is named explicitly, so routing still requires inference.

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 two real usage constraints: a Pro+ plan prerequisite and the note that it writes to cache rather than calling the Power Automate API, which helps an agent decide between this and update_live_flow. However, it never states when to prefer this tool over that sibling or what happens if used outside Pro+.

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