The Tool Desk
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What “source of truth” means for component metadata
It does not require every fact to live in one file. It means deciding which record owns each fact, reviewing that record alongside component changes, and treating generated or published views as outputs rather than competing authorities.
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A practical division is to make component source or a structured manifest authoritative for stable identity and API facts; stories authoritative for rendered examples and states; documentation pages authoritative for fuller guidance; and token files authoritative for token definitions. Link these records through a canonical component name or identifier. The exact schema is a design-system decision, not a standard imposed by the tools described here.
What a useful component record contains
Start with a compact contract that downstream documentation, catalogs and developers can use. Do not make every paragraph of editorial guidance a required API field.
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- Identity: canonical component name, package or namespace, stable link, and lifecycle status.
- Purpose: a concise rationale explaining what the component does and when to use it.
- Public contract: props or equivalent inputs, types, applicable defaults, and descriptions.
- Use and examples: links to representative stories, usage guidance, accessibility notes, and related components.
- Design references: token names and relationships, with token definitions maintained separately.
- Governance: owner, review history or date, and deprecation or migration guidance.
The first five groups are supported by documented component and token practices; ownership and lifecycle fields are recommended governance additions, not a complete standard prescribed by those sources.
Choose where each kind of information is authoritative
| Pattern | Authoritative record | Strength | Trade-off |
|---|---|---|---|
| Source-first | Component source comments and types; documentation is generated or rendered from them. | Facts travel with the exported implementation and can surface in IDEs or generated manifests. | Rich usage guidance may need a separate page, and extraction quality depends on framework and docgen tooling. |
| Story and documentation-first | Story files and documentation pages for story metadata, examples, and explanatory content. | Rendered states and human guidance can be kept together. Storybook MDX can combine metadata, stories, and prose. | Story configuration is not automatically the component’s public API; keep that distinction explicit. |
| Manifest plus generated views | A versioned, machine-readable component record feeds docs, catalogs, or other indexes. | Makes the contract explicit and gives downstream consumers a structured input. | Requires schema ownership, validation, compatibility decisions, and a synchronization pipeline. |
These patterns can be combined. Choose by weighing authoring proximity, extraction accuracy, support for rich guidance, framework portability, reviewability, and how reliably generated output can be checked for drift.
How Storybook metadata fits the contract
Storybook’s official Manifests documentation describes generating component manifests through static analysis of Component Story Format (CSF) and prop-type extraction from source code. The resulting information can include component names, descriptions, props, and usage examples, serving both documentation and machine-readable consumers.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsStorybook’s story documentation describes a story as a rendered component state annotated to explain behavior and appearance. In CSF, a default export holds component-level metadata and named exports represent stories. This makes stories useful documentation inputs, but it does not make every story setting part of the component’s stable API.
In particular, parameters configure stories or addons and can be set at story, component, or project scope. Story arguments describe inputs and rendered states. Keep both concepts distinct from the public props contract unless a field is intentionally part of that API.
Storybook recommends JSDoc for context beyond type information, including descriptions useful to AI agents. Its manifest page summarizes the rationale: “Your Storybook holds a wealth of information about your components: their names, descriptions, API, usage examples, and more.”
Keep token definitions separate from component metadata
Use component records to reference shared tokens, not to duplicate their definitions. The W3C Design Tokens Community Group’s Design Tokens Format Module 2025.10, published as a Candidate Recommendation on 2025-10-28, describes a token as information associated with a human-readable name and requires at least a name and value. It also supports properties such as type and description, with room for additional metadata.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchFor example, a button record can identify the color or spacing tokens it uses while the token source remains responsible for those tokens’ names, values, and types. USWDS illustrates this separation in practice: its design-token documentation shows component Sass using variableized tokens.
Best Value
Build the metadata workflow
- Inventory existing facts. Gather component descriptions, prop types, stories, token references, and documentation; identify duplicated or conflicting versions.
- Assign authority by field. Decide which source owns identity, purpose, public inputs, examples, token definitions, and lifecycle information. Document the choice.
- Define and validate a small schema. Require stable identifiers, useful descriptions, and valid links. Name an owner and a review path.
- Generate repeatable views where extraction works. Generate catalogs and repeated API documentation from source or structured records. Keep richer guidance in documentation, linked to the canonical component identity.
- Separate API from rendering configuration. State how props, story arguments, Storybook parameters, and tokens relate; mark which fields are stable public contract.
- Review generated output with changes. Check that published views remain aligned when the source changes, and include migration guidance when a component is deprecated.
Amsterdam’s design-system guidance offers one concrete hybrid: a short component rationale in TSDoc directly above the export, where it can appear in IDE tooltips, paired with fuller Storybook MDX documentation. Its page model covers primary stories, controls, usage guidance, examples, accessibility, related components, and design-token information. See the Amsterdam component documentation guidance.
What metadata can—and cannot—guarantee
A maintained contract makes facts easier to review and reuse; generation can reduce repeated hand-maintained API descriptions. Neither metadata nor a manifest guarantees consistency on its own. The system still needs a clear authority for each field, validation, a review process, and checks that generated views reflect their inputs.
There is no universally required file layout in these examples. Storybook and Amsterdam document workable patterns, while the W3C token format addresses token data rather than a full component-governance model. The W3C Design System is another public example of a system documenting styles, components, templates, and front-end asset layers: W3C Design System.
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Storybook documentation is rolling, so confirm extraction behavior against the version your project uses. The token reference above is specifically the 2025.10 publication.
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