diff --git a/docs/case-studies/issue-123/README.md b/docs/case-studies/issue-123/README.md
new file mode 100644
index 0000000..cca18c7
--- /dev/null
+++ b/docs/case-studies/issue-123/README.md
@@ -0,0 +1,217 @@
+# Case Study: Issue #123 - Badge Not Found
+
+## Issue Summary
+
+**Issue:** [#123 - badge not found](https://github.com/link-assistant/agent/issues/123)
+**Release:** [js-v0.8.4](https://github.com/link-assistant/agent/releases/tag/js-v0.8.4)
+**Date:** 2026-01-16
+**Type:** Bug
+
+The GitHub release notes for version 0.8.4 displayed a "404 badge not found" error from shields.io instead of the expected npm version badge.
+
+## Timeline of Events
+
+### 1. Issue #121 - Release Style Problem
+**Date:** 2026-01-13
+
+User reported that release style didn't match the template repository:
+- Wrong release name format (should use `[js]` prefix)
+- Wrong changelog path (should use `js/CHANGELOG.md`)
+- Release descriptions lacked actual changelog content
+
+### 2. PR #122 - Fix Implementation
+**Date:** 2026-01-13 to 2026-01-16
+
+PR #122 was created to fix issue #121. Key changes in `scripts/create-github-release.mjs`:
+
+```javascript
+// Before (line 26):
+const changelogPath = prefix === 'rust-' ? './rust/CHANGELOG.md' : './CHANGELOG.md';
+
+// After:
+const changelogPath =
+  prefix === 'rust-'
+    ? './rust/CHANGELOG.md'
+    : prefix === 'js-'
+      ? './js/CHANGELOG.md'
+      : './CHANGELOG.md';
+
+// Before (line 49):
+const releaseName = prefix ? `${prefix.replace(/-$/, '')} ${version}` : version;
+
+// After:
+const releaseName = prefix
+  ? `[${prefix.replace(/-$/, '')}] ${version}`
+  : version;
+```
+
+### 3. Release js-v0.8.4
+**Date:** 2026-01-16 06:26:26Z
+
+- PR #122 merged to main
+- CI/CD pipeline triggered
+- Version bump: 0.8.3 → 0.8.4
+- GitHub release created with tag `js-v0.8.4`
+- Release name: `[js] 0.8.4` ✅
+- Changelog content: correct ✅
+- NPM badge: **404 badge not found** ❌
+
+## Root Cause Analysis
+
+### The Bug Location
+
+**File:** `scripts/format-github-release.mjs` (line 82)
+
+```javascript
+const tag = `${prefix}v${version}`;
+// ...
+await $`node scripts/format-release-notes.mjs --release-id "${releaseId}" --release-version "${tag}" ...`;
+```
+
+The `--release-version` argument receives the **full tag** (`js-v0.8.4`), not just the version (`0.8.4`).
+
+**File:** `scripts/format-release-notes.mjs` (lines 192-193)
+
+```javascript
+const versionWithoutV = version.replace(/^v/, '');
+const npmBadge = `[![npm version](https://img.shields.io/badge/npm-${versionWithoutV}-blue.svg)](...)`;
+```
+
+The regex `^v` only removes a leading `v`, so:
+- Input: `js-v0.8.4`
+- After `.replace(/^v/, '')`: `js-v0.8.4` (unchanged - no leading v!)
+- Badge URL: `https://img.shields.io/badge/npm-js-v0.8.4-blue.svg`
+
+### Why This Fails
+
+Shields.io static badges use dashes (`-`) as delimiters in the URL format:
+
+```
+https://img.shields.io/badge/LABEL-MESSAGE-COLOR
+```
+
+When the version is `js-v0.8.4`, the URL becomes:
+```
+https://img.shields.io/badge/npm-js-v0.8.4-blue
+                             ├─┘ ├┘ └─────┬──────┘
+                           LABEL  │    Interpreted as COLOR
+                                 MESSAGE
+```
+
+Shields.io interprets this as:
+- **Label:** `npm`
+- **Message:** `js`
+- **Color:** `v0.8.4-blue` (invalid color!)
+
+Result: 404 badge not found error.
+
+### Working vs Broken URL Comparison
+
+| URL | Result |
+|-----|--------|
+| `https://img.shields.io/badge/npm-0.8.4-blue.svg` | ✅ Shows `npm | 0.8.4` |
+| `https://img.shields.io/badge/npm-js-v0.8.4-blue.svg` | ❌ Shows `404 | badge not found` |
+
+### Why Template Repository Works
+
+The template repository (`link-foundation/js-ai-driven-development-pipeline-template`) works correctly because it:
+1. Uses simple version tags (`v0.3.0`) without prefix
+2. The version passed to format-release-notes.mjs is just the version number
+
+In this repository (`link-assistant/agent`):
+1. Uses prefixed tags (`js-v0.8.4`, `rust-v1.0.0`) for multi-language support
+2. The full tag is incorrectly passed as the version
+
+## Proposed Solutions
+
+### Solution 1: Pass Pure Version (Recommended)
+
+**Change in `format-github-release.mjs`:**
+
+```javascript
+// Before (line 82):
+await $`node scripts/format-release-notes.mjs --release-id "${releaseId}" --release-version "${tag}" ...`;
+
+// After:
+await $`node scripts/format-release-notes.mjs --release-id "${releaseId}" --release-version "v${version}" ...`;
+```
+
+This passes `v0.8.4` instead of `js-v0.8.4`, and the existing regex in `format-release-notes.mjs` handles the `v` prefix correctly.
+
+### Solution 2: Update Regex in format-release-notes.mjs
+
+**Change in `format-release-notes.mjs`:**
+
+```javascript
+// Before (line 192):
+const versionWithoutV = version.replace(/^v/, '');
+
+// After - handle both js-v and v prefixes:
+const versionWithoutV = version.replace(/^(js-|rust-)?v/, '');
+```
+
+### Solution 3: URL-encode the Badge Text
+
+If dashes must be preserved, use shields.io URL encoding (`--` for literal dash):
+
+```javascript
+const encodedVersion = versionWithoutV.replace(/-/g, '--');
+const npmBadge = `[![npm version](https://img.shields.io/badge/npm-${encodedVersion}-blue.svg)](...)`;
+```
+
+### Recommended Approach
+
+**Solution 1** is recommended because:
+1. Minimal code change
+2. Keeps format-release-notes.mjs simple and generic
+3. The caller knows the context (prefix) and should clean it up
+
+## Evidence and Data
+
+### Files Collected
+
+- `data/release-info.json` - Release metadata from GitHub API
+- `data/pr-122-info.json` - PR #122 details and commits
+- `data/pr-122-diff.txt` - PR #122 code changes
+- `data/issue-121-details.txt` - Original issue that triggered the fix
+- `data/ci-run-21057802787.log` - CI workflow logs showing the release process
+- `screenshots/badge-not-found.png` - Screenshot showing the 404 badge error
+
+### Key Log Evidence
+
+From CI run logs:
+```
+Release	Format GitHub release notes	Formatting release notes for js-v0.8.4...
+Release	Format GitHub release notes	ℹ️ Found Patch Changes section
+Release	Format GitHub release notes	ℹ️ Looking up PR for commit afcd2f8 (from changelog)
+Release	Format GitHub release notes	✅ Found PR #122 containing commit
+Release	Format GitHub release notes	   - Added shields.io npm badge  <-- Badge added but URL is wrong
+```
+
+### Badge URL Test Results
+
+```bash
+# Broken URL
+$ curl -s "https://img.shields.io/badge/npm-js-v0.8.4-blue.svg" | grep -o 'aria-label="[^"]*"'
+aria-label="404: badge not found"
+
+# Working URL
+$ curl -s "https://img.shields.io/badge/npm-0.8.4-blue.svg" | grep -o 'aria-label="[^"]*"'
+aria-label="npm: 0.8.4"
+```
+
+## References
+
+- [Issue #123](https://github.com/link-assistant/agent/issues/123) - This bug report
+- [Issue #121](https://github.com/link-assistant/agent/issues/121) - Original style issue that triggered the buggy fix
+- [PR #122](https://github.com/link-assistant/agent/pull/122) - The PR that introduced this bug
+- [Release js-v0.8.4](https://github.com/link-assistant/agent/releases/tag/js-v0.8.4) - Affected release
+- [Shields.io Static Badge Docs](https://shields.io/badges/static-badge) - Badge URL format specification
+- [Template Repository](https://github.com/link-foundation/js-ai-driven-development-pipeline-template) - Reference implementation
+
+## Lessons Learned
+
+1. **Test with all prefixes:** When modifying release scripts that support multiple prefixes (js-, rust-), test all variants.
+2. **Understand URL encoding:** Special characters like dashes have meaning in shields.io URLs.
+3. **Trace data flow:** The bug wasn't in the modified files, but in how data flowed between scripts.
+4. **Regression testing:** The fix for #121 inadvertently broke the badge because the version format changed.
diff --git a/docs/case-studies/issue-123/data/issue-121-details.txt b/docs/case-studies/issue-123/data/issue-121-details.txt
new file mode 100644
index 0000000..51770b2
--- /dev/null
+++ b/docs/case-studies/issue-123/data/issue-121-details.txt
@@ -0,0 +1,15 @@
+title:	Release was done not in expected style
+state:	CLOSED
+author:	konard
+labels:	bug, documentation
+comments:	0
+assignees:	
+projects:	
+milestone:	
+number:	121
+--
+We should use [js] prefix in name, version is fine.
+
+But the description of the release must be like in https://github.com/link-foundation/js-ai-driven-development-pipeline-template
+
+Please use all latest best practices of https://github.com/link-foundation/js-ai-driven-development-pipeline-template for our JavaScript CI/CD. If we have something even better - please file issue to https://github.com/link-foundation/js-ai-driven-development-pipeline-template with proposal.
diff --git a/docs/case-studies/issue-123/data/pr-122-diff.txt b/docs/case-studies/issue-123/data/pr-122-diff.txt
new file mode 100644
index 0000000..f3f023c
--- /dev/null
+++ b/docs/case-studies/issue-123/data/pr-122-diff.txt
@@ -0,0 +1,56 @@
+diff --git a/js/.changeset/fix-release-style.md b/js/.changeset/fix-release-style.md
+new file mode 100644
+index 0000000..d09eb9d
+--- /dev/null
++++ b/js/.changeset/fix-release-style.md
+@@ -0,0 +1,11 @@
++---
++'@link-assistant/agent': patch
++---
++
++Fix GitHub release style to match template repository standards
++
++- Fix release name format to use `[js]` prefix instead of `js ` (e.g., `[js] 0.8.4` instead of `js 0.8.4`)
++- Fix changelog path for js releases to use `js/CHANGELOG.md` instead of root `CHANGELOG.md`
++- This ensures release descriptions contain actual changelog content with PR links and npm badges
++
++Fixes #121
+diff --git a/scripts/create-github-release.mjs b/scripts/create-github-release.mjs
+index 749a73a..69fcc4f 100644
+--- a/scripts/create-github-release.mjs
++++ b/scripts/create-github-release.mjs
+@@ -61,12 +61,20 @@ console.log(`Creating GitHub release for ${tag}...`);
+ 
+ try {
+   // Read CHANGELOG.md - check prefix for appropriate changelog location
+-  const changelogPath = prefix === 'rust-' ? './rust/CHANGELOG.md' : './CHANGELOG.md';
++  // js- prefix uses js/CHANGELOG.md, rust- prefix uses rust/CHANGELOG.md, others use root
++  const changelogPath =
++    prefix === 'rust-'
++      ? './rust/CHANGELOG.md'
++      : prefix === 'js-'
++        ? './js/CHANGELOG.md'
++        : './CHANGELOG.md';
+   let changelog = '';
+   try {
+     changelog = readFileSync(changelogPath, 'utf8');
+   } catch {
+-    console.log(`No changelog found at ${changelogPath}, using default release notes`);
++    console.log(
++      `No changelog found at ${changelogPath}, using default release notes`
++    );
+   }
+ 
+   // Extract changelog entry for this version
+@@ -87,7 +95,10 @@ try {
+   // Create release using GitHub API with JSON input
+   // This avoids shell escaping issues that occur when passing text via command-line arguments
+   // (Previously caused apostrophes like "didn't" to appear as "didn'''" in releases)
+-  const releaseName = prefix ? `${prefix.replace(/-$/, '')} ${version}` : version;
++  // Release name format: "[prefix] version" for prefixed releases (e.g., "[js] 0.8.3"), just version otherwise
++  const releaseName = prefix
++    ? `[${prefix.replace(/-$/, '')}] ${version}`
++    : version;
+   const payload = JSON.stringify({
+     tag_name: tag,
+     name: releaseName,
diff --git a/docs/case-studies/issue-123/data/pr-122-info.json b/docs/case-studies/issue-123/data/pr-122-info.json
new file mode 100644
index 0000000..d71e20b
--- /dev/null
+++ b/docs/case-studies/issue-123/data/pr-122-info.json
@@ -0,0 +1 @@
+{"author":{"id":"MDQ6VXNlcjE0MzE5MDQ=","is_bot":false,"login":"konard","name":"Konstantin Diachenko"},"body":"## Summary\n- Fix release name format to use `[js]` prefix (e.g., `[js] 0.8.4` instead of `js 0.8.4`)\n- Fix changelog path for js releases to use `js/CHANGELOG.md` instead of root `CHANGELOG.md`\n- This ensures release descriptions contain actual changelog content with PR links and npm badges\n\n## Problem\nThe release script was using incorrect changelog path and release name format:\n1. **Wrong changelog path**: For `js-` prefixed releases, it was reading `./CHANGELOG.md` (root) instead of `./js/CHANGELOG.md`\n2. **Wrong name format**: Used `js 0.8.3` format instead of `[js] 0.8.3`\n\nThis caused releases to show a generic `Release X.X.X` description instead of the actual changelog content.\n\n## Solution\nUpdated `scripts/create-github-release.mjs` to:\n1. Read the correct changelog file based on the prefix\n2. Format release names with brackets around the prefix\n\n## Test plan\n- [ ] Verify next release uses `[js]` prefix format in the release name\n- [ ] Verify next release description contains actual changelog content\n- [ ] Verify PR link and npm badge appear in release notes\n\nFixes #121\n\n---\n🤖 Generated with [Claude Code](https://claude.com/claude-code)","commits":[{"authoredDate":"2026-01-13T21:03:41Z","authors":[{"email":"drakonard@gmail.com","id":"MDQ6VXNlcjE0MzE5MDQ=","login":"konard","name":"konard"}],"committedDate":"2026-01-13T21:03:41Z","messageBody":"Adding CLAUDE.md with task information for AI processing.\nThis file will be removed when the task is complete.\n\nIssue: https://github.com/link-assistant/agent/issues/121","messageHeadline":"Initial commit with task details","oid":"c662d6518214a71b186e6b9a14f165067b9a45ed"},{"authoredDate":"2026-01-13T21:07:35Z","authors":[{"email":"drakonard@gmail.com","id":"MDQ6VXNlcjE0MzE5MDQ=","login":"konard","name":"konard"},{"email":"noreply@anthropic.com","id":"MDQ6VXNlcjgxODQ3","login":"claude","name":"Claude Opus 4.5"}],"committedDate":"2026-01-13T21:07:35Z","messageBody":"- Fix release name format to use [js] prefix (e.g., \"[js] 0.8.4\")\n- Fix changelog path for js releases to use js/CHANGELOG.md\n- Ensures releases have proper descriptions with PR links and npm badges\n\nFixes #121\n\nCo-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>","messageHeadline":"fix: align GitHub release style with template repository","oid":"afcd2f83ac180e5668eed315e915a2f0bac917a6"},{"authoredDate":"2026-01-13T21:11:14Z","authors":[{"email":"drakonard@gmail.com","id":"MDQ6VXNlcjE0MzE5MDQ=","login":"konard","name":"konard"},{"email":"noreply@anthropic.com","id":"MDQ6VXNlcjgxODQ3","login":"claude","name":"Claude Opus 4.5"}],"committedDate":"2026-01-13T21:11:14Z","messageBody":"Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>","messageHeadline":"chore: remove automated setup file","oid":"9c45b0443b7b72c1782fd5721d30debfe107af09"}],"files":[{"path":"js/.changeset/fix-release-style.md","additions":11,"deletions":0},{"path":"scripts/create-github-release.mjs","additions":14,"deletions":3}],"mergedAt":"2026-01-16T06:26:26Z","title":"fix: align GitHub release style with template repository"}
diff --git a/docs/case-studies/issue-123/data/release-info.json b/docs/case-studies/issue-123/data/release-info.json
new file mode 100644
index 0000000..3aa02d0
--- /dev/null
+++ b/docs/case-studies/issue-123/data/release-info.json
@@ -0,0 +1 @@
+{"author":{"id":"MDM6Qm90NDE4OTgyODI=","login":"github-actions[bot]"},"body":"Fix GitHub release style to match template repository standards\n- Fix release name format to use `[js]` prefix instead of `js ` (e.g., `[js] 0.8.4` instead of `js 0.8.4`)\n- Fix changelog path for js releases to use `js/CHANGELOG.md` instead of root `CHANGELOG.md`\n- This ensures release descriptions contain actual changelog content with PR links and npm badges\n\nFixes #121\n\n**Related Pull Request:** #122\n\n---\n\n[![npm version](https://img.shields.io/badge/npm-js-v0.8.4-blue.svg)](https://www.npmjs.com/package/@link-assistant/agent/v/js-v0.8.4)","createdAt":"2026-01-16T06:28:24Z","name":"[js] 0.8.4","publishedAt":"2026-01-16T06:29:04Z","tagName":"js-v0.8.4"}
diff --git a/docs/case-studies/issue-123/screenshots/badge-not-found.png b/docs/case-studies/issue-123/screenshots/badge-not-found.png
new file mode 100644
index 0000000..b8e870e
Binary files /dev/null and b/docs/case-studies/issue-123/screenshots/badge-not-found.png differ
diff --git a/experiments/test-badge-url.mjs b/experiments/test-badge-url.mjs
new file mode 100644
index 0000000..9d82cad
--- /dev/null
+++ b/experiments/test-badge-url.mjs
@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+
+/**
+ * Test script to verify shields.io badge URL generation
+ *
+ * This tests the fix for issue #123 where the badge URL was incorrectly
+ * generated with the tag prefix (js-v0.8.4) instead of just the version (v0.8.4)
+ *
+ * Run: node experiments/test-badge-url.mjs
+ */
+
+const PACKAGE_NAME = '@link-assistant/agent';
+
+// Test cases
+const testCases = [
+  { version: 'v0.8.4', description: 'Correct: version with v prefix only' },
+  { version: 'js-v0.8.4', description: 'Incorrect: full tag with js- prefix' },
+  { version: '0.8.4', description: 'Edge case: version without v prefix' },
+  { version: 'rust-v1.0.0', description: 'Incorrect: full tag with rust- prefix' },
+];
+
+console.log('Testing shields.io badge URL generation\n');
+console.log('='.repeat(80) + '\n');
+
+for (const { version, description } of testCases) {
+  // Current code logic
+  const versionWithoutV = version.replace(/^v/, '');
+  const badgeUrl = `https://img.shields.io/badge/npm-${versionWithoutV}-blue.svg`;
+  const npmUrl = `https://www.npmjs.com/package/${PACKAGE_NAME}/v/${versionWithoutV}`;
+
+  console.log(`Test: ${description}`);
+  console.log(`  Input version: "${version}"`);
+  console.log(`  After .replace(/^v/, ''): "${versionWithoutV}"`);
+  console.log(`  Badge URL: ${badgeUrl}`);
+
+  // Check if URL will work
+  const parts = versionWithoutV.split('-');
+  const isValid = parts.length === 1 || (parts.length === 3 && /^\d+$/.test(parts[0]));
+
+  // A simple heuristic: if the version contains dashes that aren't part of semver,
+  // shields.io will misinterpret it
+  const hasProblem = /^[a-z]+-/.test(versionWithoutV);
+
+  if (hasProblem) {
+    console.log(`  Result: ❌ WILL FAIL - shields.io interprets dashes as delimiters`);
+    console.log(`           Parsed as: LABEL="npm", MESSAGE="${parts[0]}", COLOR="${parts.slice(1).join('-')}"`);
+  } else {
+    console.log(`  Result: ✅ Should work correctly`);
+  }
+  console.log('');
+}
+
+console.log('='.repeat(80));
+console.log('\nFix: Pass "v${version}" instead of "${tag}" to format-release-notes.mjs');
+console.log('This ensures the version never has the prefix (js-, rust-) in the badge URL.');
diff --git a/js/.changeset/fix-badge-url.md b/js/.changeset/fix-badge-url.md
new file mode 100644
index 0000000..c758cde
--- /dev/null
+++ b/js/.changeset/fix-badge-url.md
@@ -0,0 +1,12 @@
+---
+'@link-assistant/agent': patch
+---
+
+Fix shields.io badge URL in GitHub release notes
+
+- Fixed badge URL generation that was broken by tag prefixes (js-, rust-)
+- The `format-github-release.mjs` script now passes `v${version}` instead of the full tag
+- This ensures the badge URL contains only the version number (e.g., `0.8.4`) without prefix
+- See `docs/case-studies/issue-123` for detailed root cause analysis
+
+Fixes #123
diff --git a/scripts/format-github-release.mjs b/scripts/format-github-release.mjs
index 4f13705..9ecd4c2 100644
--- a/scripts/format-github-release.mjs
+++ b/scripts/format-github-release.mjs
@@ -79,7 +79,10 @@ try {
     console.log(`Formatting release notes for ${tag}...`);
     // Pass the trigger commit SHA for PR detection
     // This allows proper PR lookup even if the changelog doesn't have a commit hash
-    await $`node scripts/format-release-notes.mjs --release-id "${releaseId}" --release-version "${tag}" --repository "${repository}" --commit-sha "${commitSha}"`;
+    // IMPORTANT: Pass version with v-prefix only (e.g., "v0.8.4"), NOT the full tag (e.g., "js-v0.8.4")
+    // The format-release-notes.mjs script uses this for shields.io badge URL which uses dashes as delimiters
+    // See: docs/case-studies/issue-123 for detailed root cause analysis
+    await $`node scripts/format-release-notes.mjs --release-id "${releaseId}" --release-version "v${version}" --repository "${repository}" --commit-sha "${commitSha}"`;
     console.log(`\u2705 Formatted release notes for ${tag}`);
   }
 } catch (error) {