diff --git a/.github/workflows/cli-version-checker.lock.yml b/.github/workflows/cli-version-checker.lock.yml
index 4aad547df5b..d76dcaac1f7 100644
--- a/.github/workflows/cli-version-checker.lock.yml
+++ b/.github/workflows/cli-version-checker.lock.yml
@@ -1245,9 +1245,14 @@ jobs:
           
           ### Version Sources
           - **Claude Code**: Use `npm view @anthropic-ai/claude-code version` (faster than web-fetch)
+            - No public GitHub repository
           - **Copilot CLI**: Use `npm view @github/copilot version`
+            - Repository: https://github.com/github/copilot-cli (may be private)
           - **Codex**: Use `npm view @openai/codex version`
+            - Repository: https://github.com/openai/codex
+            - Release Notes: https://github.com/openai/codex/releases
           - **GitHub MCP Server**: `https://api.github.com/repos/github/github-mcp-server/releases/latest`
+            - Release Notes: https://github.com/github/github-mcp-server/releases
           
           **Optimization**: Fetch all versions in parallel using multiple npm view or WebFetch calls in a single turn.
           
@@ -1258,6 +1263,21 @@ jobs:
           - Document migration requirements
           - Assign risk level (Low/Medium/High)
           
+          **GitHub Release Notes (when available)**:
+          - **Codex**: Fetch release notes from https://github.com/openai/codex/releases/tag/rust-v{VERSION}
+            - Parse the "Highlights" section for key changes
+            - Parse the "PRs merged" or "Merged PRs" section for detailed changes
+            - Extract links to pull requests and issues for context
+          - **GitHub MCP Server**: Fetch release notes from https://github.com/github/github-mcp-server/releases/tag/v{VERSION}
+            - Parse release body for changelog entries
+          - **Copilot CLI**: Repository may be private, skip release notes if inaccessible
+          - **Claude Code**: No public repository, rely on NPM metadata and CLI help output
+          
+          **NPM Metadata Fallback**: When GitHub release notes are unavailable, use:
+          - `npm view <package> --json` for package metadata
+          - Compare CLI help outputs between versions
+          - Check for version changelog in package description
+          
           ### Tool Installation & Discovery
           **CACHE OPTIMIZATION**: 
           - Before installing, check cache-memory for previous help outputs
@@ -1294,6 +1314,7 @@ jobs:
           - **Impact Assessment**: Risk level, affected features, migration notes
           - **Changelog Links**: Use plain URLs without backticks
           - **CLI Changes**: New commands, flags, or removed features discovered via help
+          - **GitHub Release Notes**: Include highlights and PR summaries when available from GitHub releases
           
           **URL Formatting Rules**:
           - Use plain URLs without backticks around package names
@@ -1314,10 +1335,17 @@ jobs:
           - Impact: Risk [Low/Medium/High], affects [features]
           - Migration: [Yes/No - details if yes]
           
+          ## Release Highlights (from GitHub)
+          [Include key highlights from GitHub release notes if available]
+          
+          ## Merged PRs (from GitHub)
+          [List significant merged PRs from release notes if available]
+          
           ## Package Links
           - **NPM Package**: https://www.npmjs.com/package/package-name-here
           - **Repository**: [GitHub URL if available]
-          - **Changelog**: [URL to changelog if available]
+          - **Release Notes**: [GitHub releases URL if available]
+          - **Specific Release**: [Direct link to version's release notes if available]
           ```
           
           ## Guidelines
@@ -1328,6 +1356,10 @@ jobs:
           - **CHECK CACHE FIRST**: Before re-analyzing versions, check cache-memory for recent results
           - **PARALLEL FETCHING**: Fetch all versions in parallel using multiple npm/WebFetch calls in one turn
           - **EARLY EXIT**: If no version changes detected, save check timestamp to cache and exit successfully
+          - **FETCH GITHUB RELEASE NOTES**: For tools with public GitHub repositories, fetch release notes to get detailed changelog information
+            - Codex: Always fetch from https://github.com/openai/codex/releases
+            - GitHub MCP Server: Always fetch from https://github.com/github/github-mcp-server/releases
+            - Copilot CLI: Try to fetch, but may be inaccessible (private repo)
           - Install and test CLI tools to discover new features via `--help`
           - Compare help output between old and new versions
           - **SAVE TO CACHE**: Store help outputs and version check results in cache-memory
diff --git a/.github/workflows/cli-version-checker.md b/.github/workflows/cli-version-checker.md
index 33f08bfa51e..ff260ac7312 100644
--- a/.github/workflows/cli-version-checker.md
+++ b/.github/workflows/cli-version-checker.md
@@ -47,9 +47,14 @@ For each CLI/MCP server:
 
 ### Version Sources
 - **Claude Code**: Use `npm view @anthropic-ai/claude-code version` (faster than web-fetch)
+  - No public GitHub repository
 - **Copilot CLI**: Use `npm view @github/copilot version`
+  - Repository: https://github.com/github/copilot-cli (may be private)
 - **Codex**: Use `npm view @openai/codex version`
+  - Repository: https://github.com/openai/codex
+  - Release Notes: https://github.com/openai/codex/releases
 - **GitHub MCP Server**: `https://api.github.com/repos/github/github-mcp-server/releases/latest`
+  - Release Notes: https://github.com/github/github-mcp-server/releases
 
 **Optimization**: Fetch all versions in parallel using multiple npm view or WebFetch calls in a single turn.
 
@@ -60,6 +65,21 @@ For each update, analyze intermediate versions:
 - Document migration requirements
 - Assign risk level (Low/Medium/High)
 
+**GitHub Release Notes (when available)**:
+- **Codex**: Fetch release notes from https://github.com/openai/codex/releases/tag/rust-v{VERSION}
+  - Parse the "Highlights" section for key changes
+  - Parse the "PRs merged" or "Merged PRs" section for detailed changes
+  - Extract links to pull requests and issues for context
+- **GitHub MCP Server**: Fetch release notes from https://github.com/github/github-mcp-server/releases/tag/v{VERSION}
+  - Parse release body for changelog entries
+- **Copilot CLI**: Repository may be private, skip release notes if inaccessible
+- **Claude Code**: No public repository, rely on NPM metadata and CLI help output
+
+**NPM Metadata Fallback**: When GitHub release notes are unavailable, use:
+- `npm view <package> --json` for package metadata
+- Compare CLI help outputs between versions
+- Check for version changelog in package description
+
 ### Tool Installation & Discovery
 **CACHE OPTIMIZATION**: 
 - Before installing, check cache-memory for previous help outputs
@@ -96,6 +116,7 @@ Include for each updated CLI:
 - **Impact Assessment**: Risk level, affected features, migration notes
 - **Changelog Links**: Use plain URLs without backticks
 - **CLI Changes**: New commands, flags, or removed features discovered via help
+- **GitHub Release Notes**: Include highlights and PR summaries when available from GitHub releases
 
 **URL Formatting Rules**:
 - Use plain URLs without backticks around package names
@@ -116,10 +137,17 @@ Template structure:
 - Impact: Risk [Low/Medium/High], affects [features]
 - Migration: [Yes/No - details if yes]
 
+## Release Highlights (from GitHub)
+[Include key highlights from GitHub release notes if available]
+
+## Merged PRs (from GitHub)
+[List significant merged PRs from release notes if available]
+
 ## Package Links
 - **NPM Package**: https://www.npmjs.com/package/package-name-here
 - **Repository**: [GitHub URL if available]
-- **Changelog**: [URL to changelog if available]
+- **Release Notes**: [GitHub releases URL if available]
+- **Specific Release**: [Direct link to version's release notes if available]
 ```
 
 ## Guidelines
@@ -130,6 +158,10 @@ Template structure:
 - **CHECK CACHE FIRST**: Before re-analyzing versions, check cache-memory for recent results
 - **PARALLEL FETCHING**: Fetch all versions in parallel using multiple npm/WebFetch calls in one turn
 - **EARLY EXIT**: If no version changes detected, save check timestamp to cache and exit successfully
+- **FETCH GITHUB RELEASE NOTES**: For tools with public GitHub repositories, fetch release notes to get detailed changelog information
+  - Codex: Always fetch from https://github.com/openai/codex/releases
+  - GitHub MCP Server: Always fetch from https://github.com/github/github-mcp-server/releases
+  - Copilot CLI: Try to fetch, but may be inaccessible (private repo)
 - Install and test CLI tools to discover new features via `--help`
 - Compare help output between old and new versions
 - **SAVE TO CACHE**: Store help outputs and version check results in cache-memory