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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, and openWorldHint=true, so the safety profile is largely covered. The description adds two genuine facts: the deck must be owned, and image uploads/deletion are out of scope. However it never explains the destructive semantics implied by destructiveHint (that setting a field overwrites existing values, and null clears theme/location/password), which is the most consequential behavior for an agent to know.

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 sentences, zero filler. The positive capability statement comes first and the scope limitation second, so the agent gets the primary purpose before the caveat.

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 two-parameter mutation tool with a rich nested schema, a 100% coverage schema, and an output schema, the definition covers purpose, ownership scope, and unsupported operations adequately. It omits any statement about partial updates or the destructive clearing semantics, which would be the remaining gap.

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. The description's grouped nouns (roster selection, copy, branding preset, colors, link, access settings) loosely map onto the nested changes fields (creator_ids, bio/title/tags, theme, accent_color/background_color, slug, visibility/password), giving light navigational value but no format, constraint, or interaction detail beyond what the schema already documents.

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 ('Edit') and resource ('an owned deck') and then enumerates the editable surface (roster, copy, branding preset, colors, link, access settings). This cleanly separates it from deck_create, deck_get, and deck_list among its siblings without requiring the reader to open any schema.

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?

Provides an explicit exclusion set ('Image uploads and deletion are not supported'), which tells the agent when this tool will not work. It does not name an alternative tool for those excluded operations, nor state prerequisites such as required ownership/permissions beyond the word 'owned', so it falls short of a full when/when-not/alternative treatment.

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