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

Annotations already declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, so the safety profile is covered structurally. The description adds one behavioral fact, that settings apply to the next run rather than retroactively, but says nothing about what is overwritten, whether existing settings must be preserved, or auth requirements. Value beyond annotations is minimal.

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?

It is a single short sentence with no padding, which is structurally fine, but the brevity comes at the cost of under-specification rather than efficiency. Nothing is front-loaded beyond a restatement of the title.

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 mutation tool with no output schema, the description should at minimum explain the write and its effect on downstream storyboard generation. It gestures at the run dependency but leaves the operation, overwrite behavior, and relationship to storyboard_generate/storyboard_read unexplained, which is too thin for a 3-parameter required-schema edit tool.

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 action, sfx_level and project_id are each documented at the schema level, including the enum meanings for sfx_level. The description adds no parameter semantics at all, so the baseline 3 for fully covered schemas applies.

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 'Storyboard settings, used by the next storyboard run' restates the title rather than stating an action verb, so it never says what the tool actually does (edit/set). The clause about the next storyboard run is the only added information, and it describes effect timing rather than the operation. Without the name and title, an agent could not tell this mutates settings.

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?

There is no explicit when-to-use guidance and no named alternatives, though the sibling storyboard_generate and storyboard_read exist and are the natural contrast points. The phrase 'used by the next storyboard run' weakly implies invocation prior to generation, but nothing states when not to use it or how it relates to the read/generate siblings.

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