feat(agents): add Goose AI agent support

AGENTS.md

@@ -17,7 +17,7 @@ Each AI agent is a self-contained **integration subpackage** under `src/specify_
 ```
 src/specify_cli/integrations/
 ├── __init__.py            # INTEGRATION_REGISTRY + _register_builtins()
-├── base.py                # IntegrationBase, MarkdownIntegration, TomlIntegration, SkillsIntegration
+├── base.py                # IntegrationBase, MarkdownIntegration, TomlIntegration, YamlIntegration, SkillsIntegration
 ├── manifest.py            # IntegrationManifest (file tracking)
 ├── claude/                # Example: SkillsIntegration subclass
 │   ├── __init__.py        #   ClaudeIntegration class
@@ -48,6 +48,7 @@ The registry is the **single source of truth for Python integration metadata**.
 |---|---|
 | Standard markdown commands (`.md`) | `MarkdownIntegration` |
 | TOML-format commands (`.toml`) | `TomlIntegration` |
+| YAML recipe files (`.yaml`) | `YamlIntegration` |
 | Skill directories (`speckit-<name>/SKILL.md`) | `SkillsIntegration` |
 | Fully custom output (companion files, settings merge, etc.) | `IntegrationBase` directly |
 
@@ -343,16 +344,82 @@ Command content with {SCRIPT} and {{args}} placeholders.
 """
 ```
 
+### YAML Format
+
+Used by: Goose
+
+```yaml
+version: 1.0.0
+title: "Command Title"
+description: "Command description"
+author:
+  contact: spec-kit
+extensions:
+  - type: builtin
+    name: developer
+activities:
+  - Spec-Driven Development
+prompt: |
+  Command content with {SCRIPT} and {{args}} placeholders.
+```
+
 ## Argument Patterns
 
 Different agents use different argument placeholders. The placeholder used in command files is always taken from `registrar_config["args"]` for each integration — check there first when in doubt:
 
 - **Markdown/prompt-based**: `$ARGUMENTS` (default for most markdown agents)
 - **TOML-based**: `{{args}}` (e.g., Gemini)
+- **YAML-based**: `{{args}}` (e.g., Goose)
 - **Custom**: some agents override the default (e.g., Forge uses `{{parameters}}`)
 - **Script placeholders**: `{SCRIPT}` (replaced with actual script path)
 - **Agent placeholders**: `__AGENT__` (replaced with agent name)
 
+## Special Processing Requirements
+
+Some agents require custom processing beyond the standard template transformations:
+
+### Copilot Integration
+
+GitHub Copilot has unique requirements:
+- Commands use `.agent.md` extension (not `.md`)
+- Each command gets a companion `.prompt.md` file in `.github/prompts/`
+- Installs `.vscode/settings.json` with prompt file recommendations
+- Context file lives at `.github/copilot-instructions.md`
+
+Implementation: Extends `IntegrationBase` with custom `setup()` method that:
+1. Processes templates with `process_template()`
+2. Generates companion `.prompt.md` files
+3. Merges VS Code settings
+
+### Forge Integration
+
+Forge has special frontmatter and argument requirements:
+- Uses `{{parameters}}` instead of `$ARGUMENTS`
+- Strips `handoffs` frontmatter key (Forge-specific collaboration feature)
+- Injects `name` field into frontmatter when missing
+
+Implementation: Extends `MarkdownIntegration` with custom `setup()` method that:
+1. Inherits standard template processing from `MarkdownIntegration`
+2. Adds extra `$ARGUMENTS` → `{{parameters}}` replacement after template processing
+3. Applies Forge-specific transformations via `_apply_forge_transformations()`
+4. Strips `handoffs` frontmatter key
+5. Injects missing `name` fields
+6. Ensures the shared `update-agent-context.*` scripts include a `forge` case that maps context updates to `AGENTS.md` and lists `forge` in their usage/help text
+
+### Goose Integration
+
+Goose is a YAML-format agent using Block's recipe system:
+- Uses `.goose/recipes/` directory for YAML recipe files
+- Uses `{{args}}` argument placeholder
+- Produces YAML with `prompt: |` block scalar for command content
+
+Implementation: Extends `YamlIntegration` (parallel to `TomlIntegration`):
+1. Processes templates through the standard placeholder pipeline
+2. Extracts title and description from frontmatter
+3. Renders output as Goose recipe YAML (version, title, description, author, extensions, activities, prompt)
+4. Uses `yaml.safe_dump()` for header fields to ensure proper escaping
+5. Context updates map to `AGENTS.md` (shared with opencode/codex/pi/forge)
+
 ## Common Pitfalls
 
 1. **Using shorthand keys for CLI-based integrations**: For CLI-based integrations (`requires_cli: True`), the `key` must match the executable name (e.g., `"cursor-agent"` not `"cursor"`). `shutil.which(key)` is used for CLI tool checks — mismatches require special-case mappings. IDE-based integrations (`requires_cli: False`) are not subject to this constraint.

README.md

@@ -302,6 +302,7 @@ Community projects that extend, visualize, or build on Spec Kit:
 | [Cursor](https://cursor.sh/)                                                         | ✅      |                                                                                                                                           |
 | [Forge](https://forgecode.dev/)                                                      | ✅      | CLI tool: `forge`                                                                                                                         |
 | [Gemini CLI](https://github.com/google-gemini/gemini-cli)                            | ✅      |                                                                                                                                           |
+| [Goose](https://block.github.io/goose/)                                              | ✅      | Uses YAML recipe format in `.goose/recipes/` with slash command support                                                                   |
 | [GitHub Copilot](https://code.visualstudio.com/)                                     | ✅      |                                                                                                                                           |
 | [IBM Bob](https://www.ibm.com/products/bob)                                          | ✅      | IDE-based agent with slash command support                                                                                                |
 | [Jules](https://jules.google.com/)                                                   | ✅      |                                                                                                                                           |
@@ -640,7 +641,7 @@ specify init . --force --ai claude
 specify init --here --force --ai claude
 ```
 
-The CLI will check if you have Claude Code, Gemini CLI, Cursor CLI, Qwen CLI, opencode, Codex CLI, Qoder CLI, Tabnine CLI, Kiro CLI, Pi, Forge, or Mistral Vibe installed. If you do not, or you prefer to get the templates without checking for the right tools, use `--ignore-agent-tools` with your command:
+The CLI will check if you have Claude Code, Gemini CLI, Cursor CLI, Qwen CLI, opencode, Codex CLI, Qoder CLI, Tabnine CLI, Kiro CLI, Pi, Forge, Goose, or Mistral Vibe installed. If you do not, or you prefer to get the templates without checking for the right tools, use `--ignore-agent-tools` with your command:
 
 ```bash
 specify init <project_name> --ai claude --ignore-agent-tools

scripts/bash/update-agent-context.sh

@@ -30,12 +30,12 @@
 #
 # 5. Multi-Agent Support
 #    - Handles agent-specific file paths and naming conventions
-#    - Supports: Claude, Gemini, Copilot, Cursor, Qwen, opencode, Codex, Windsurf, Junie, Kilo Code, Auggie CLI, Roo Code, CodeBuddy CLI, Qoder CLI, Amp, SHAI, Tabnine CLI, Kiro CLI, Mistral Vibe, Kimi Code, Pi Coding Agent, iFlow CLI, Forge, Antigravity or Generic
+#    - Supports: Claude, Gemini, Copilot, Cursor, Qwen, opencode, Codex, Windsurf, Junie, Kilo Code, Auggie CLI, Roo Code, CodeBuddy CLI, Qoder CLI, Amp, SHAI, Tabnine CLI, Kiro CLI, Mistral Vibe, Kimi Code, Pi Coding Agent, iFlow CLI, Forge, Goose, Antigravity or Generic
 #    - Can update single agents or all existing agent files
 #    - Creates default Claude file if no agent files exist
 #
 # Usage: ./update-agent-context.sh [agent_type]
-# Agent types: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|generic
+# Agent types: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|goose|generic
 # Leave empty to update all existing agent files
 
 set -e
@@ -74,7 +74,7 @@ AUGGIE_FILE="$REPO_ROOT/.augment/rules/specify-rules.md"
 ROO_FILE="$REPO_ROOT/.roo/rules/specify-rules.md"
 CODEBUDDY_FILE="$REPO_ROOT/CODEBUDDY.md"
 QODER_FILE="$REPO_ROOT/QODER.md"
-# Amp, Kiro CLI, IBM Bob, Pi, and Forge all share AGENTS.md — use AGENTS_FILE to avoid
+# Amp, Kiro CLI, IBM Bob, Pi, Forge, and Goose all share AGENTS.md — use AGENTS_FILE to avoid
 # updating the same file multiple times.
 AMP_FILE="$AGENTS_FILE"
 SHAI_FILE="$REPO_ROOT/SHAI.md"
@@ -710,12 +710,15 @@ update_specific_agent() {
         forge)
             update_agent_file "$AGENTS_FILE" "Forge" || return 1
             ;;
+        goose)
+            update_agent_file "$AGENTS_FILE" "Goose" || return 1
+            ;;
         generic)
             log_info "Generic agent: no predefined context file. Use the agent-specific update script for your agent."
             ;;
         *)
             log_error "Unknown agent type '$agent_type'"
-            log_error "Expected: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|generic"
+            log_error "Expected: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|goose|generic"
             exit 1
             ;;
     esac
@@ -759,7 +762,7 @@ update_all_existing_agents() {
     _update_if_new "$COPILOT_FILE" "GitHub Copilot"        || _all_ok=false
     _update_if_new "$CURSOR_FILE" "Cursor IDE"             || _all_ok=false
     _update_if_new "$QWEN_FILE" "Qwen Code"                || _all_ok=false
-    _update_if_new "$AGENTS_FILE" "Codex/opencode/Amp/Kiro/Bob/Pi/Forge" || _all_ok=false
+    _update_if_new "$AGENTS_FILE" "Codex/opencode/Amp/Kiro/Bob/Pi/Forge/Goose" || _all_ok=false
     _update_if_new "$WINDSURF_FILE" "Windsurf"             || _all_ok=false
     _update_if_new "$JUNIE_FILE" "Junie"                || _all_ok=false
     _update_if_new "$KILOCODE_FILE" "Kilo Code"            || _all_ok=false

scripts/powershell/update-agent-context.ps1

@@ -9,7 +9,7 @@ Mirrors the behavior of scripts/bash/update-agent-context.sh:
  2. Plan Data Extraction
  3. Agent File Management (create from template or update existing)
  4. Content Generation (technology stack, recent changes, timestamp)
- 5. Multi-Agent Support (claude, gemini, copilot, cursor-agent, qwen, opencode, codex, windsurf, junie, kilocode, auggie, roo, codebuddy, amp, shai, tabnine, kiro-cli, agy, bob, vibe, qodercli, kimi, trae, pi, iflow, forge, generic)
+ 5. Multi-Agent Support (claude, gemini, copilot, cursor-agent, qwen, opencode, codex, windsurf, junie, kilocode, auggie, roo, codebuddy, amp, shai, tabnine, kiro-cli, agy, bob, vibe, qodercli, kimi, trae, pi, iflow, forge, goose, generic)
 
 .PARAMETER AgentType
 Optional agent key to update a single agent. If omitted, updates all existing agent files (creating a default Claude file if none exist).
@@ -25,7 +25,7 @@ Relies on common helper functions in common.ps1
 #>
 param(
     [Parameter(Position=0)]
-    [ValidateSet('claude','gemini','copilot','cursor-agent','qwen','opencode','codex','windsurf','junie','kilocode','auggie','roo','codebuddy','amp','shai','tabnine','kiro-cli','agy','bob','vibe','qodercli','kimi','trae','pi','iflow','forge','generic')]
+    [ValidateSet('claude','gemini','copilot','cursor-agent','qwen','opencode','codex','windsurf','junie','kilocode','auggie','roo','codebuddy','amp','shai','tabnine','kiro-cli','agy','bob','vibe','qodercli','kimi','trae','pi','iflow','forge','goose','generic')]
     [string]$AgentType
 )
 
@@ -68,6 +68,7 @@ $KIMI_FILE     = Join-Path $REPO_ROOT 'KIMI.md'
 $TRAE_FILE     = Join-Path $REPO_ROOT '.trae/rules/project_rules.md'
 $IFLOW_FILE    = Join-Path $REPO_ROOT 'IFLOW.md'
 $FORGE_FILE    = Join-Path $REPO_ROOT 'AGENTS.md'
+$GOOSE_FILE    = Join-Path $REPO_ROOT 'AGENTS.md'
 
 $TEMPLATE_FILE = Join-Path $REPO_ROOT '.specify/templates/agent-file-template.md'
 
@@ -417,8 +418,9 @@ function Update-SpecificAgent {
         'pi'       { Update-AgentFile -TargetFile $AGENTS_FILE   -AgentName 'Pi Coding Agent' }
         'iflow'    { Update-AgentFile -TargetFile $IFLOW_FILE    -AgentName 'iFlow CLI' }
         'forge'    { Update-AgentFile -TargetFile $FORGE_FILE    -AgentName 'Forge' }
+        'goose'    { Update-AgentFile -TargetFile $GOOSE_FILE    -AgentName 'Goose' }
         'generic'  { Write-Info 'Generic agent: no predefined context file. Use the agent-specific update script for your agent.' }
-        default { Write-Err "Unknown agent type '$Type'"; Write-Err 'Expected: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|generic'; return $false }
+        default { Write-Err "Unknown agent type '$Type'"; Write-Err 'Expected: claude|gemini|copilot|cursor-agent|qwen|opencode|codex|windsurf|junie|kilocode|auggie|roo|codebuddy|amp|shai|tabnine|kiro-cli|agy|bob|vibe|qodercli|kimi|trae|pi|iflow|forge|goose|generic'; return $false }
     }
 }
 
@@ -460,7 +462,7 @@ function Update-AllExistingAgents {
     if (-not (Update-IfNew -FilePath $COPILOT_FILE  -AgentName 'GitHub Copilot')) { $ok = $false }
     if (-not (Update-IfNew -FilePath $CURSOR_FILE   -AgentName 'Cursor IDE')) { $ok = $false }
     if (-not (Update-IfNew -FilePath $QWEN_FILE     -AgentName 'Qwen Code')) { $ok = $false }
-    if (-not (Update-IfNew -FilePath $AGENTS_FILE   -AgentName 'Codex/opencode/Amp/Kiro/Bob/Pi/Forge')) { $ok = $false }
+    if (-not (Update-IfNew -FilePath $AGENTS_FILE   -AgentName 'Codex/opencode/Amp/Kiro/Bob/Pi/Forge/Goose')) { $ok = $false }
     if (-not (Update-IfNew -FilePath $WINDSURF_FILE -AgentName 'Windsurf')) { $ok = $false }
     if (-not (Update-IfNew -FilePath $JUNIE_FILE    -AgentName 'Junie')) { $ok = $false }
     if (-not (Update-IfNew -FilePath $KILOCODE_FILE -AgentName 'Kilo Code')) { $ok = $false }