SDLC blueprint

Handbook

SDD I/O schema — ceremonies & process slots

**Purpose:** Define a **repeatable, machine- and human-friendly** shape for specifying **inputs, outputs, preconditions, and artifacts** for any **ceremony intent (C1–C6)** or **named process slot** (

SDD I/O schema — ceremonies & process slots

Purpose: Define a repeatable, machine- and human-friendly shape for specifying inputs, outputs, preconditions, and artifacts for any ceremony intent (C1–C6) or named process slot (planning, gate, refinement, …). Use this so agents, engineers, and product share one contract.

Pairs with: Spec-driven development overview · Ceremony foundation · Templates in SDD templates (Spec-driven development)

When to use which template

You are specifying… Template file
A foundation intent (C1–C6) or a calendar event mapped to intents CEREMONY INTENT (template)
A process step or gate (sequential slice of work, often phased or release) PROCESS SLOT (template)

Document structure (required sections)

Every SDD ceremony/process spec SHOULD include these sections in order (copy from the template):

Section Meaning
SDD metadata YAML frontmatter: sdd_id, kind, version, maps_to, status
Summary One short paragraph: what this slot does in the delivery system
Boundaries In scope / out of scope for this spec (prevents ceremony creep)
Preconditions What must already be true or available before the slot starts
Inputs Consumed during the slot (read, discussed, transformed)—each with type, owner, format, example
Outputs Produced by the end of the slot—each with consumer, storage location, example
Postconditions Observable done criteria (checkboxes)
Participants RACI-style or lead + required participants
Artifact register Fine-grained list: id, name, type, producer → consumer
Traceability Work-unit IDs, doc paths, tracker links
Filled example Concrete instance (same headings, fictional but realistic project)

YAML frontmatter (normative keys)

---
sdd_id: SDD-C1-ALIGN           # unique, stable string
kind: ceremony_intent         # ceremony_intent | process_slot
version: "1.0"
status: draft                 # draft | active | deprecated
maps_to:
  ceremony_intents: [C1]      # C1..C6; empty [] for pure process slots
  methodology_events: []      # optional: ["Sprint Planning — Part 1", …]
  sdlc_phases: [A, B]           # optional: A–F touch
title: "Align on intent — horizon H"
owner_archetype: "Demand & value"   # from roles-archetypes if useful
---

Input / output row shape (tables)

Use one row per artifact (not one row per meeting). Minimum columns:

Preconditions

ID Artifact Format Owner Ready when (criterion)

Inputs

ID Name Type Source Format Example (snippet)

Outputs

ID Name Type Primary consumer Storage / system Example (snippet)

Artifact register (optional extra granularity)

Art-ID Name Kind Producer Consumer Versioning

Quality rules

  1. Examples are mandatory — at least one filled example per spec; vague rows without examples are incomplete.
  2. IDs are stable — sdd_id and row ID columns do not change meaning mid-flight; use a new version or new sdd_id if semantics shift.
  3. One consumer minimum — every output names who uses it next (person, role, or system).
  4. Chat is not storage — outputs must name repo path, tracker object, or tool; “verbal agreement” is not an output row unless followed by a written record in the named system.
  5. Maps to C1–C6 — ceremony specs should tag intent(s) so the foundation and methodology forks stay aligned.

Handbook subchapters (HTML)

Path Use
CEREMONY INTENT (template) Blank ceremony / intent SDD spec
PROCESS SLOT (template) Blank process step / gate SDD spec

Canonical source

Edit https://github.com/autowww/blueprints/blob/main/sdlc/methodologies/spec-driven/SDD-IO-SCHEMA.md first; regenerate with docs/build-handbook.py.