Fix docs: update Antigravity link and add initialization example (#1748)

* Fix docs: update Antigravity link and add initialization example

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Manfred Riem <15701806+mnriem@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

README.md

@@ -161,7 +161,7 @@ Want to see Spec Kit in action? Watch our [video overview](https://www.youtube.c
 | [Roo Code](https://roocode.com/)                                                     | ✅      |                                                                                                                                           |
 | [SHAI (OVHcloud)](https://github.com/ovh/shai)                                       | ✅      |                                                                                                                                           |
 | [Windsurf](https://windsurf.com/)                                                    | ✅      |                                                                                                                                           |
-| [Antigravity (agy)](https://agy.ai/)                                                 | ✅      |                                                                                                                                           |
+| [Antigravity (agy)](https://antigravity.google/)                                     | ✅      |                                                                                                                                           |
 | Generic                                                                              | ✅      | Bring your own agent — use `--ai generic --ai-commands-dir <path>` for unsupported agents                                                 |
 
 ## 🔧 Specify CLI Reference
@@ -222,6 +222,9 @@ specify init my-project --ai shai
 # Initialize with IBM Bob support
 specify init my-project --ai bob
 
+# Initialize with Antigravity support
+specify init my-project --ai agy
+
 # Initialize with an unsupported agent (generic / bring your own agent)
 specify init my-project --ai generic --ai-commands-dir .myagent/commands/
 

templates/commands/implement.md

@@ -13,6 +13,40 @@ $ARGUMENTS
 
 You **MUST** consider the user input before proceeding (if not empty).
 
+## Pre-Execution Checks
+
+**Check for extension hooks (before implementation)**:
+- Check if `.specify/extensions.yml` exists in the project root.
+- If it exists, read it and look for entries under the `hooks.before_implement` key
+- If the YAML cannot be parsed or is invalid, skip hook checking silently and continue normally
+- Filter to only hooks where `enabled: true`
+- For each remaining hook, do **not** attempt to interpret or evaluate hook `condition` expressions:
+  - If the hook has no `condition` field, or it is null/empty, treat the hook as executable
+  - If the hook defines a non-empty `condition`, skip the hook and leave condition evaluation to the HookExecutor implementation
+- For each executable hook, output the following based on its `optional` flag:
+  - **Optional hook** (`optional: true`):
+    ```
+    ## Extension Hooks
+
+    **Optional Pre-Hook**: {extension}
+    Command: `/{command}`
+    Description: {description}
+
+    Prompt: {prompt}
+    To execute: `/{command}`
+    ```
+  - **Mandatory hook** (`optional: false`):
+    ```
+    ## Extension Hooks
+
+    **Automatic Pre-Hook**: {extension}
+    Executing: `/{command}`
+    EXECUTE_COMMAND: {command}
+    
+    Wait for the result of the hook command before proceeding to the Outline.
+    ```
+- If no hooks are registered or `.specify/extensions.yml` does not exist, skip silently
+
 ## Outline
 
 1. Run `{SCRIPT}` from repo root and parse FEATURE_DIR and AVAILABLE_DOCS list. All paths must be absolute. For single quotes in args like "I'm Groot", use escape syntax: e.g 'I'\''m Groot' (or double-quote if possible: "I'm Groot").
@@ -88,7 +122,7 @@ You **MUST** consider the user input before proceeding (if not empty).
    - **Rust**: `target/`, `debug/`, `release/`, `*.rs.bk`, `*.rlib`, `*.prof*`, `.idea/`, `*.log`, `.env*`
    - **Kotlin**: `build/`, `out/`, `.gradle/`, `.idea/`, `*.class`, `*.jar`, `*.iml`, `*.log`, `.env*`
    - **C++**: `build/`, `bin/`, `obj/`, `out/`, `*.o`, `*.so`, `*.a`, `*.exe`, `*.dll`, `.idea/`, `*.log`, `.env*`
-   - **C**: `build/`, `bin/`, `obj/`, `out/`, `*.o`, `*.a`, `*.so`, `*.exe`, `autom4te.cache/`, `config.status`, `config.log`, `.idea/`, `*.log`, `.env*`
+   - **C**: `build/`, `bin/`, `obj/`, `out/`, `*.o`, `*.a`, `*.so`, `*.exe`, `*.dll`, `autom4te.cache/`, `config.status`, `config.log`, `.idea/`, `*.log`, `.env*`
    - **Swift**: `.build/`, `DerivedData/`, `*.swiftpm/`, `Packages/`
    - **R**: `.Rproj.user/`, `.Rhistory`, `.RData`, `.Ruserdata`, `*.Rproj`, `packrat/`, `renv/`
    - **Universal**: `.DS_Store`, `Thumbs.db`, `*.tmp`, `*.swp`, `.vscode/`, `.idea/`
@@ -136,3 +170,32 @@ You **MUST** consider the user input before proceeding (if not empty).
    - Report final status with summary of completed work
 
 Note: This command assumes a complete task breakdown exists in tasks.md. If tasks are incomplete or missing, suggest running `/speckit.tasks` first to regenerate the task list.
+
+10. **Check for extension hooks**: After completion validation, check if `.specify/extensions.yml` exists in the project root.
+    - If it exists, read it and look for entries under the `hooks.after_implement` key
+    - If the YAML cannot be parsed or is invalid, skip hook checking silently and continue normally
+    - Filter to only hooks where `enabled: true`
+    - For each remaining hook, do **not** attempt to interpret or evaluate hook `condition` expressions:
+      - If the hook has no `condition` field, or it is null/empty, treat the hook as executable
+      - If the hook defines a non-empty `condition`, skip the hook and leave condition evaluation to the HookExecutor implementation
+    - For each executable hook, output the following based on its `optional` flag:
+      - **Optional hook** (`optional: true`):
+        ```
+        ## Extension Hooks
+
+        **Optional Hook**: {extension}
+        Command: `/{command}`
+        Description: {description}
+
+        Prompt: {prompt}
+        To execute: `/{command}`
+        ```
+      - **Mandatory hook** (`optional: false`):
+        ```
+        ## Extension Hooks
+
+        **Automatic Hook**: {extension}
+        Executing: `/{command}`
+        EXECUTE_COMMAND: {command}
+        ```
+    - If no hooks are registered or `.specify/extensions.yml` does not exist, skip silently

templates/commands/tasks.md

@@ -22,6 +22,40 @@ $ARGUMENTS
 
 You **MUST** consider the user input before proceeding (if not empty).
 
+## Pre-Execution Checks
+
+**Check for extension hooks (before tasks generation)**:
+- Check if `.specify/extensions.yml` exists in the project root.
+- If it exists, read it and look for entries under the `hooks.before_tasks` key
+- If the YAML cannot be parsed or is invalid, skip hook checking silently and continue normally
+- Filter to only hooks where `enabled: true`
+- For each remaining hook, do **not** attempt to interpret or evaluate hook `condition` expressions:
+  - If the hook has no `condition` field, or it is null/empty, treat the hook as executable
+  - If the hook defines a non-empty `condition`, skip the hook and leave condition evaluation to the HookExecutor implementation
+- For each executable hook, output the following based on its `optional` flag:
+  - **Optional hook** (`optional: true`):
+    ```
+    ## Extension Hooks
+
+    **Optional Pre-Hook**: {extension}
+    Command: `/{command}`
+    Description: {description}
+
+    Prompt: {prompt}
+    To execute: `/{command}`
+    ```
+  - **Mandatory hook** (`optional: false`):
+    ```
+    ## Extension Hooks
+
+    **Automatic Pre-Hook**: {extension}
+    Executing: `/{command}`
+    EXECUTE_COMMAND: {command}
+    
+    Wait for the result of the hook command before proceeding to the Outline.
+    ```
+- If no hooks are registered or `.specify/extensions.yml` does not exist, skip silently
+
 ## Outline
 
 1. **Setup**: Run `{SCRIPT}` from repo root and parse FEATURE_DIR and AVAILABLE_DOCS list. All paths must be absolute. For single quotes in args like "I'm Groot", use escape syntax: e.g 'I'\''m Groot' (or double-quote if possible: "I'm Groot").
@@ -63,6 +97,35 @@ You **MUST** consider the user input before proceeding (if not empty).
    - Suggested MVP scope (typically just User Story 1)
    - Format validation: Confirm ALL tasks follow the checklist format (checkbox, ID, labels, file paths)
 
+6. **Check for extension hooks**: After tasks.md is generated, check if `.specify/extensions.yml` exists in the project root.
+   - If it exists, read it and look for entries under the `hooks.after_tasks` key
+   - If the YAML cannot be parsed or is invalid, skip hook checking silently and continue normally
+   - Filter to only hooks where `enabled: true`
+   - For each remaining hook, do **not** attempt to interpret or evaluate hook `condition` expressions:
+     - If the hook has no `condition` field, or it is null/empty, treat the hook as executable
+     - If the hook defines a non-empty `condition`, skip the hook and leave condition evaluation to the HookExecutor implementation
+   - For each executable hook, output the following based on its `optional` flag:
+     - **Optional hook** (`optional: true`):
+       ```
+       ## Extension Hooks
+
+       **Optional Hook**: {extension}
+       Command: `/{command}`
+       Description: {description}
+
+       Prompt: {prompt}
+       To execute: `/{command}`
+       ```
+     - **Mandatory hook** (`optional: false`):
+       ```
+       ## Extension Hooks
+
+       **Automatic Hook**: {extension}
+       Executing: `/{command}`
+       EXECUTE_COMMAND: {command}
+       ```
+   - If no hooks are registered or `.specify/extensions.yml` does not exist, skip silently
+
 Context for task generation: {ARGS}
 
 The tasks.md should be immediately executable - each task must be specific enough that an LLM can complete it without additional context.

tests/hooks/.specify/extensions.yml

@@ -0,0 +1,34 @@
+hooks:
+  before_implement:
+    - id: pre_test
+      enabled: true
+      optional: false
+      extension: "test-extension"
+      command: "pre_implement_test"
+      description: "Test before implement hook execution"
+      
+  after_implement:
+    - id: post_test
+      enabled: true
+      optional: true
+      extension: "test-extension"
+      command: "post_implement_test"
+      description: "Test after implement hook execution"
+      prompt: "Would you like to run the post-implement test?"
+
+  before_tasks:
+    - id: pre_tasks_test
+      enabled: true
+      optional: false
+      extension: "test-extension"
+      command: "pre_tasks_test"
+      description: "Test before tasks hook execution"
+
+  after_tasks:
+    - id: post_tasks_test
+      enabled: true
+      optional: true
+      extension: "test-extension"
+      command: "post_tasks_test"
+      description: "Test after tasks hook execution"
+      prompt: "Would you like to run the post-tasks test?"

tests/hooks/TESTING.md

@@ -0,0 +1,30 @@
+# Testing Extension Hooks
+
+This directory contains a mock project to verify that LLM agents correctly identify and execute hook commands defined in `.specify/extensions.yml`.
+
+## Test 1: Testing `before_tasks` and `after_tasks`
+
+1. Open a chat with an LLM (like GitHub Copilot) in this project.
+2. Ask it to generate tasks for the current directory:
+   > "Please follow `/speckit.tasks` for the `./tests/hooks` directory."
+3. **Expected Behavior**: 
+   - Before doing any generation, the LLM should notice the `AUTOMATIC Pre-Hook` in `.specify/extensions.yml` under `before_tasks`.
+   - It should state it is executing `EXECUTE_COMMAND: pre_tasks_test`.
+   - It should then proceed to read the `.md` docs and produce a `tasks.md`.
+   - After generation, it should output the optional `after_tasks` hook (`post_tasks_test`) block, asking if you want to run it.
+
+## Test 2: Testing `before_implement` and `after_implement`
+
+*(Requires `tasks.md` from Test 1 to exist)*
+
+1. In the same (or new) chat, ask the LLM to implement the tasks:
+   > "Please follow `/speckit.implement` for the `./tests/hooks` directory."
+2. **Expected Behavior**:
+   - The LLM should first check for `before_implement` hooks.
+   - It should state it is executing `EXECUTE_COMMAND: pre_implement_test` BEFORE doing any actual task execution.
+   - It should evaluate the checklists and execute the code writing tasks.
+   - Upon completion, it should output the optional `after_implement` hook (`post_implement_test`) block.
+
+## How it works
+
+The templates for these commands in `templates/commands/tasks.md` and `templates/commands/implement.md` contains strict ordered lists. The new `before_*` hooks are explicitly formulated in a **Pre-Execution Checks** section prior to the outline to ensure they're evaluated first without breaking template step numbers.

tests/hooks/plan.md

@@ -0,0 +1,3 @@
+# Test Setup for Hooks
+
+This feature is designed to test if LLMs correctly invoke Spec Kit extensions hooks when generating tasks and implementing code.

tests/hooks/spec.md

@@ -0,0 +1 @@
+- **User Story 1:** I want a test script that prints "Hello hooks!".

tests/hooks/tasks.md

@@ -0,0 +1 @@
+- [ ] T001 [US1] Create script that prints 'Hello hooks!' in hello.py