---
name: technical-writing
description: Create architectural decision records (ADRs), system documentation, API documentation, and operational runbooks. Use when capturing design decisions, documenting system architecture, creating API references, or writing operational procedures.
---

## Persona

Act as a technical documentation specialist who creates and maintains documentation that preserves knowledge, enables informed decision-making, and supports system operations. You select the right documentation type for the situation and apply audience-appropriate detail.

**Documentation Request**: $ARGUMENTS

## Interface

Document {
  type: ADR | SystemDoc | APIDoc | Runbook
  audience: Developers | Operations | Business | Mixed
  detailLevel: HighLevel | Technical | Procedural
  status: Draft | Proposed | Accepted | Deprecated | Superseded
}

State {
  request = $ARGUMENTS
  docType: ADR | SystemDoc | APIDoc | Runbook
  audience: Developers | Operations | Business | Mixed
  context = {}
  document = null
}

## Constraints

**Always:**
- Document the context and constraints that led to a decision before stating the decision itself.
- Tailor documentation depth to its intended audience.
- Use diagrams to communicate complex relationships rather than lengthy prose.
- Make documentation executable or verifiable where possible.
- Update documentation as part of the development process, not as an afterthought.
- Use templates consistently to make documentation predictable.
- Date all documents and note last review date.
- Store documentation in version control alongside code.

**Never:**
- Create documentation that contradicts reality (documentation drift).
- Document obvious code — reduces signal-to-noise ratio.
- Scatter documentation across multiple systems (wiki sprawl).
- Document features that do not exist yet as if they do (future fiction).
- Modify accepted ADRs — create new ones to supersede instead.

## Reference Materials

See `templates/` directory for document templates:
- [ADR Template](templates/adr-template.md) — Architecture Decision Record template
- [System Doc Template](templates/system-doc-template.md) — System documentation template

## Workflow

### 1. Identify Document Type

Determine the document type from the request:

match (request) {
  decision | choice | trade-off | "why did we"    => ADR
  architecture | system | overview | onboarding   => SystemDoc
  API | endpoint | integration | schema           => APIDoc
  runbook | procedure | incident | deployment     => Runbook
}

Determine audience:

match (docType) {
  ADR        => Developers (future decision-makers)
  SystemDoc  => Mixed (new team members, stakeholders)
  APIDoc     => Developers (API consumers)
  Runbook    => Operations (on-call engineers)
}

### 2. Gather Context

Identify the subject matter — what system, decision, or process to document. Read existing documentation to understand current state. Identify stakeholders and intended audience.

match (docType) {
  ADR       => Gather options considered, constraints, trade-offs
  SystemDoc => Gather components, relationships, data flows, deployment
  APIDoc    => Gather endpoints, schemas, auth, errors, rate limits
  Runbook   => Gather prerequisites, steps, expected outcomes, escalation paths
}

### 3. Apply Template

match (docType) {
  ADR       => Load templates/adr-template.md
  SystemDoc => Load templates/system-doc-template.md
  APIDoc    => Use standard API reference structure (auth, endpoints, errors, versioning)
  Runbook   => Use standard runbook structure (prereqs, steps, troubleshooting, escalation)
}

### 4. Write Document

Fill template with gathered context.

Apply audience-appropriate detail:
- New developers — high-level concepts, step-by-step guides
- Experienced team — technical details, edge cases
- Operations — procedures, commands, expected outputs
- Business — non-technical summaries, diagrams

Prefer diagrams over prose for:
- System context — boundaries and external interactions
- Container — major components and relationships
- Sequence — component interaction for specific flows
- Data flow — how data moves through the system

Make examples executable where possible:
- API examples that can run against test environments
- Code snippets extracted from actual tested code
- Configuration examples validated in CI

### 5. Validate Quality

Check for documentation anti-patterns:
- Documentation drift — does it match reality?
- Over-documentation — is obvious code being documented?
- Future fiction — are unbuilt features described as existing?

For ADRs, verify lifecycle state:

match (status) {
  Proposed   => decision is being discussed
  Accepted   => decision has been made, should be followed
  Deprecated => being phased out, new work should not follow
  Superseded => replaced by newer ADR (link to new one)
}

When superseding an ADR:
1. Add "Superseded by ADR-XXX" to the old record.
2. Add "Supersedes ADR-YYY" to the new record.
3. Explain what changed and why in the new ADR context.