Merge upstream: Add speckit-utils catalog + Extensions & Presets docs

Author: kanfil

README.md

@@ -51,6 +51,7 @@ This fork represents the evolution from a development process to a complete orga
 - [🤖 Supported AI Agents](#-supported-ai-agents)
 - [📦 Skills Package Manager](#-skills-package-manager)
 - [🔧 Specify CLI Reference](#-specify-cli-reference)
+- [🧩 Making Spec Kit Your Own: Extensions & Presets](#-making-spec-kit-your-own-extensions--presets)
 - [📚 Core Philosophy](#-core-philosophy)
 - [🌟 Development Phases](#-development-phases)
 - [🎯 Experimental Goals](#-experimental-goals)
@@ -911,6 +912,68 @@ Commands provided by bundled extensions. See extension READMEs for full document
 | ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | `SPECIFY_FEATURE` | Override feature detection for non-Git repositories. Set to the feature directory name (e.g., `001-photo-albums`) to work on a specific feature when not using Git branches.<br/>\*\*Must be set in the context of the agent you're working with prior to using `/spec.plan` or follow-up commands. |
 
+## 🧩 Making Spec Kit Your Own: Extensions & Presets
+
+Spec Kit can be tailored to your needs through two complementary systems — **extensions** and **presets** — plus project-local overrides for one-off adjustments:
+
+```mermaid
+block-beta
+    columns 1
+    overrides["⬆ Highest priority\nProject-Local Overrides\n.specify/templates/overrides/"]
+    presets["Presets — Customize core & extensions\n.specify/presets/<preset-id>/templates/"]
+    extensions["Extensions — Add new capabilities\n.specify/extensions/<ext-id>/templates/"]
+    core["Spec Kit Core — Built-in SDD commands & templates\n.specify/templates/\n⬇ Lowest priority"]
+
+    style overrides fill:transparent,stroke:#999
+    style presets fill:transparent,stroke:#4a9eda
+    style extensions fill:transparent,stroke:#4a9e4a
+    style core fill:transparent,stroke:#e6a817
+```
+
+**Templates** are resolved at **runtime** — Spec Kit walks the stack top-down and uses the first match. Project-local overrides (`.specify/templates/overrides/`) let you make one-off adjustments for a single project without creating a full preset. **Commands** are applied at **install time** — when you run `specify extension add` or `specify preset add`, command files are written into agent directories (e.g., `.claude/commands/`). If multiple presets or extensions provide the same command, the highest-priority version wins. On removal, the next-highest-priority version is restored automatically. If no overrides or customizations exist, Spec Kit uses its core defaults.
+
+### Extensions — Add New Capabilities
+
+Use **extensions** when you need functionality that goes beyond Spec Kit's core. Extensions introduce new commands and templates — for example, adding domain-specific workflows that are not covered by the built-in SDD commands, integrating with external tools, or adding entirely new development phases. They expand *what Spec Kit can do*.
+
+```bash
+# Search available extensions
+specify extension search
+
+# Install an extension
+specify extension add <extension-name>
+```
+
+For example, extensions could add Jira integration, post-implementation code review, V-Model test traceability, or project health diagnostics.
+
+See the [Extensions README](./extensions/README.md) for the full guide, the complete community catalog, and how to build and publish your own.
+
+### Presets — Customize Existing Workflows
+
+Use **presets** when you want to change *how* Spec Kit works without adding new capabilities. Presets override the templates and commands that ship with the core *and* with installed extensions — for example, enforcing a compliance-oriented spec format, using domain-specific terminology, or applying organizational standards to plans and tasks. They customize the artifacts and instructions that Spec Kit and its extensions produce.
+
+```bash
+# Search available presets
+specify preset search
+
+# Install a preset
+specify preset add <preset-name>
+```
+
+For example, presets could restructure spec templates to require regulatory traceability, adapt the workflow to fit the methodology you use (e.g., Agile, Kanban, Waterfall, jobs-to-be-done, or domain-driven design), add mandatory security review gates to plans, enforce test-first task ordering, or localize the entire workflow to a different language. The [pirate-speak demo](https://github.com/mnriem/spec-kit-pirate-speak-preset-demo) shows just how deep the customization can go. Multiple presets can be stacked with priority ordering.
+
+See the [Presets README](./presets/README.md) for the full guide, including resolution order, priority, and how to create your own.
+
+### When to Use Which
+
+| Goal | Use |
+| --- | --- |
+| Add a brand-new command or workflow | Extension |
+| Customize the format of specs, plans, or tasks | Preset |
+| Integrate an external tool or service | Extension |
+| Enforce organizational or regulatory standards | Preset |
+| Ship reusable domain-specific templates | Either — presets for template overrides, extensions for templates bundled with new commands |
+
 ## 📚 Core Philosophy
 
 Spec-Driven Development is a structured process that emphasizes:

extensions/README.md

@@ -87,6 +87,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Reconcile Extension | Reconcile implementation drift by surgically updating feature artifacts. | [spec-kit-reconcile](https://github.com/stn1slv/spec-kit-reconcile) |
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
 | Review Extension | Post-implementation comprehensive code review with specialized agents for code quality, comments, tests, error handling, type design, and simplification | [spec-kit-review](https://github.com/ismaelJimenez/spec-kit-review) |
+| SDD Utilities | Resume interrupted workflows, validate project health, and verify spec-to-task traceability | [speckit-utils](https://github.com/mvanhorn/speckit-utils) |
 | Spec Sync | Detect and resolve drift between specs and implementation. AI-assisted resolution with human approval | [spec-kit-sync](https://github.com/bgervin/spec-kit-sync) |
 | Understanding | Automated requirements quality analysis — 31 deterministic metrics against IEEE/ISO standards with experimental energy-based ambiguity detection | [understanding](https://github.com/Testimonial/understanding) |
 | V-Model Extension Pack | Enforces V-Model paired generation of development specs and test specs with full traceability | [spec-kit-v-model](https://github.com/leocamello/spec-kit-v-model) |

extensions/catalog.community.json

@@ -1,6 +1,6 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-03-18T18:53:31Z",
+  "updated_at": "2026-03-18T19:53:31Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.community.json",
   "extensions": {
     "archive": {
@@ -452,6 +452,38 @@
       "created_at": "2026-03-06T00:00:00Z",
       "updated_at": "2026-03-06T00:00:00Z"
     },
+    "speckit-utils": {
+      "name": "SDD Utilities",
+      "id": "speckit-utils",
+      "description": "Resume interrupted workflows, validate project health, and verify spec-to-task traceability.",
+      "author": "mvanhorn",
+      "version": "1.0.0",
+      "download_url": "https://github.com/mvanhorn/speckit-utils/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/mvanhorn/speckit-utils",
+      "homepage": "https://github.com/mvanhorn/speckit-utils",
+      "documentation": "https://github.com/mvanhorn/speckit-utils/blob/main/README.md",
+      "changelog": "https://github.com/mvanhorn/speckit-utils/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.1.0"
+      },
+      "provides": {
+        "commands": 3,
+        "hooks": 2
+      },
+      "tags": [
+        "resume",
+        "doctor",
+        "validate",
+        "workflow",
+        "health-check"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-03-18T00:00:00Z",
+      "updated_at": "2026-03-18T00:00:00Z"
+    },
     "sync": {
       "name": "Spec Sync",
       "id": "sync",

presets/README.md

@@ -13,13 +13,15 @@ When Spec Kit needs a template (e.g. `spec-template`), it walks a resolution sta
 
 If no preset is installed, core templates are used — exactly the same behavior as before presets existed.
 
+Template resolution happens **at runtime** — although preset files are copied into `.specify/presets/<id>/` during installation, Spec Kit walks the resolution stack on every template lookup rather than merging templates into a single location.
+
 For detailed resolution and command registration flows, see [ARCHITECTURE.md](ARCHITECTURE.md).
 
 ## Command Overrides
 
 Presets can also override the commands that guide the SDD workflow. Templates define *what* gets produced (specs, plans, constitutions); commands define *how* the LLM produces them (the step-by-step instructions).
 
-When a preset includes `type: "command"` entries, the commands are automatically registered into all detected agent directories (`.claude/commands/`, `.gemini/commands/`, etc.) in the correct format (Markdown or TOML with appropriate argument placeholders). When the preset is removed, the registered commands are cleaned up.
+Unlike templates, command overrides are applied **at install time**. When a preset includes `type: "command"` entries, the commands are registered into all detected agent directories (`.claude/commands/`, `.gemini/commands/`, etc.) in the correct format (Markdown or TOML with appropriate argument placeholders). When the preset is removed, the registered commands are cleaned up.
 
 ## Quick Start