dependency-update-bot

name	dependency-update-bot
description	Scans your project for outdated npm, pip, Cargo, Go, or Ruby packages. Runs a CVE security audit. Fetches changelogs, summarizes breaking changes with Gemini, and opens one PR per risk group (patch, minor, major). Includes Diagnosis Mode for install conflicts. Use when asked to update dependencies, check for outdated packages, open dependency PRs, scan for package updates, audit for CVEs, or flag breaking changes in upgrades. Trigger when a user says "check for outdated packages", "update my dependencies", "open PRs for dependency updates", "scan for CVEs", or "which packages need upgrading".
compatibility	["claude-code","gemini-cli","github-copilot"]
author	OpenDirectory
version	1.0.0

Dependency Update Bot

Scan for outdated packages. Run a security audit. Fetch changelogs. Summarize breaking changes. Open one PR per risk group.

---

Critical rule: Only update packages that the package manager's outdated command actually reports. Never guess or invent version numbers. If a changelog cannot be fetched, note the gap rather than inventing content.

---

Step 1: Setup Check

echo "GEMINI_API_KEY: ${GEMINI_API_KEY:+set}"
echo "GITHUB_TOKEN: ${GITHUB_TOKEN:-not set, changelog fetching rate-limited to 60/hour}"
gh auth status 2>/dev/null | head -1 || echo "gh: not authenticated"

If GEMINI_API_KEY is missing: Stop. Tell the user: "GEMINI_API_KEY is required. Get it at aistudio.google.com. Add it to your .env file."

If gh is not authenticated: Stop. Tell the user: "GitHub CLI must be authenticated. Run: gh auth login"

Detect package manager(s):

ls package.json 2>/dev/null && echo "npm"
ls requirements.txt pyproject.toml 2>/dev/null && echo "pip"
ls Cargo.toml 2>/dev/null && echo "cargo"
ls go.mod 2>/dev/null && echo "go"
ls Gemfile 2>/dev/null && echo "ruby"

If multiple are found, ask: "Found [list]. Which should I scan? (all / npm / pip / cargo / go / ruby)"

---

Step 2: Detect Outdated Packages

npm:

npm outdated --json --long 2>/dev/null | python3 -c "
import sys, json
data = json.load(sys.stdin)
for name, info in data.items():
    print(json.dumps({'name': name, 'current': info.get('current','?'), 'latest': info.get('latest','?'), 'dep_type': info.get('type','dependencies')}))
"

pip:

pip list --outdated --format=json 2>/dev/null | python3 -c "
import sys, json
for p in json.load(sys.stdin):
    print(json.dumps({'name': p['name'], 'current': p['version'], 'latest': p['latest_version']}))
"

Cargo (Rust):

cargo outdated --format json 2>/dev/null || \
  cargo outdated 2>/dev/null | grep -v "^---" | tail -n +3 | head -30
# If cargo-outdated not installed: cargo install cargo-outdated

Go modules:

go list -u -m -json all 2>/dev/null | python3 -c "
import sys, json
decoder = json.JSONDecoder()
buf = sys.stdin.read()
pos = 0
while pos < len(buf):
    try:
        obj, idx = decoder.raw_decode(buf, pos)
        if obj.get('Update'):
            print(json.dumps({'name': obj['Path'], 'current': obj['Version'], 'latest': obj['Update']['Version']}))
        pos += idx
    except: break
"

Ruby (Bundler):

bundle outdated --parseable 2>/dev/null | python3 -c "
import sys
for line in sys.stdin:
    parts = line.strip().split()
    if len(parts) >= 4:
        print('{\"name\":\"' + parts[0] + '\",\"current\":\"' + parts[3].strip('()') + '\",\"latest\":\"' + parts[1] + '\"}')
"

If all return empty: "All packages are up to date." Stop.

State count before proceeding: "Found X outdated packages."

---

Step 3: Classify by Risk Level

Parse version bump (current → latest):

• MAJOR: first digit changed (1.x.x → 2.x.x)
• MINOR: second digit changed (1.2.x → 1.3.x)
• PATCH: third digit changed (1.2.3 → 1.2.4)

python3 -c "
def classify(current, latest):
    try:
        c = [int(x) for x in current.lstrip('v').split('.')[:3]]
        l = [int(x) for x in latest.lstrip('v').split('.')[:3]]
        if l[0] > c[0]: return 'major'
        if len(l) > 1 and len(c) > 1 and l[1] > c[1]: return 'minor'
        return 'patch'
    except: return 'unknown'
"

State the breakdown: "Patch: X packages. Minor: Y packages. Major: Z packages."

---

Step 4: Security Audit

Run a CVE scan before creating any PRs. This determines urgency.

npm:

npm audit --json 2>/dev/null | python3 -c "
import sys, json
d = json.load(sys.stdin)
vulns = d.get('vulnerabilities', {})
for pkg, info in vulns.items():
    sev = info.get('severity', 'unknown')
    via = [v.get('title','') for v in info.get('via',[]) if isinstance(v, dict)]
    print(f'  [{sev.upper()}] {pkg}: {via[0] if via else \"see npm audit\"}')
" 2>/dev/null || echo "No vulnerabilities found or npm audit not available"

pip:

pip-audit --format=json 2>/dev/null | python3 -c "
import sys, json
for vuln in json.load(sys.stdin):
    print(f'  [{vuln.get(\"aliases\",[\"\"])[0]}] {vuln[\"name\"]} {vuln[\"version\"]}: {vuln[\"description\"][:80]}')
" 2>/dev/null || echo "pip-audit not installed. Run: pip install pip-audit"

Cargo:

cargo audit 2>/dev/null | grep -E "^(ID|Package|Severity|URL)" | head -30 \
  || echo "cargo-audit not installed. Run: cargo install cargo-audit"

Escalation rule: If a PATCH or MINOR update has a Critical or High CVE, promote it to MAJOR priority: it gets its own PR and the CVE details go in the PR body.

Report security findings before proceeding:

Security audit: [N] vulnerabilities found
  [CRITICAL] lodash 4.17.19: Prototype Pollution (CVE-2021-23337)
  [HIGH] axios 0.21.1: Server-Side Request Forgery (CVE-2021-3749)

If no vulnerabilities: "Security audit: clean."

---

Step 5: Fetch Changelogs

For each package, try sources in order. Stop at first that returns content.

Source 1: GitHub Releases API

Get repo URL from registry:

# npm
curl -s "https://registry.npmjs.org/{PACKAGE}/latest" \
  | python3 -c "import sys,json; d=json.load(sys.stdin); r=d.get('repository',{}); print(r.get('url','') if isinstance(r,dict) else str(r))"

# pip
curl -s "https://pypi.org/pypi/{PACKAGE}/json" \
  | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('info',{}).get('home_page','') or d.get('info',{}).get('project_urls',{}).get('Source',''))"

Fetch last 5 releases:

AUTH_HEADER=""
[ -n "$GITHUB_TOKEN" ] && AUTH_HEADER="-H \"Authorization: Bearer $GITHUB_TOKEN\""
curl -s $AUTH_HEADER \
  "https://api.github.com/repos/{OWNER}/{REPO}/releases?per_page=5" \
  | python3 -c "import sys,json; [print(json.dumps({'tag':r.get('tag_name',''),'body':r.get('body','')[:1500]})) for r in json.load(sys.stdin)]"

Keep releases between current and latest version only.

Source 2: npm registry README (fallback)

curl -s "https://registry.npmjs.org/{PACKAGE}" \
  | python3 -c "import sys,json; print(json.load(sys.stdin).get('readme','')[:3000])"

Source 3: PyPI description (last resort for pip)

curl -s "https://pypi.org/pypi/{PACKAGE}/json" \
  | python3 -c "import sys,json; print(json.load(sys.stdin).get('info',{}).get('description','')[:2000])"

If no source returns content: note "No changelog found" and continue.

---

Step 6: Summarize with Gemini

One request per risk group. Include security findings for any CVE-affected packages:

cat > /tmp/deps-summary-request.json << 'ENDJSON'
{
  "system_instruction": {
    "parts": [{
      "text": "You are a developer writing a GitHub PR description for a dependency update. Given a list of packages being updated and their raw changelog content, write a concise PR body in Markdown. Rules: For each package, list only what changed between the OLD version and the NEW version. Use bullet points. Flag breaking changes with a BREAKING prefix. Flag CVE fixes with a SECURITY prefix and include the CVE ID. Keep each package section to 3-5 bullets maximum. If no changelog was found for a package, write 'No changelog available.' Do not use em dashes. Do not use these words: seamless, robust, leverage, transform, innovative. Output only the Markdown PR body, no commentary."
    }]
  },
  "contents": [{
    "parts": [{
      "text": "PACKAGES_AND_CHANGELOGS_HERE"
    }]
  }],
  "generationConfig": {
    "temperature": 0.2,
    "maxOutputTokens": 2048
  }
}
ENDJSON

curl -s -X POST \
  "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=$GEMINI_API_KEY" \
  -H "Content-Type: application/json" \
  -d @/tmp/deps-summary-request.json \
  | python3 -c "import sys,json; d=json.load(sys.stdin); print(d['candidates'][0]['content']['parts'][0]['text'])"

---

Step 7: Create PRs

One PR per non-empty risk group. One PR per package for major updates (individual review required).

1. Create branch:

BRANCH="deps/{RISK}-updates-$(date +%Y%m%d)"
git checkout -b "$BRANCH"

2. Update package file:

npm:

npm install {package}@{latest_version} --save-exact
# devDependencies:
npm install {package}@{latest_version} --save-dev --save-exact

pip:

python3 -c "
import re, sys
pkg, version, filename = sys.argv[1], sys.argv[2], sys.argv[3]
with open(filename) as f: content = f.read()
pattern = rf'^{re.escape(pkg)}[>=<!\s].*$'
new_content = re.sub(pattern, f'{pkg}=={version}', content, flags=re.MULTILINE|re.IGNORECASE)
if new_content == content: new_content = content + f'\n{pkg}=={version}'
open(filename, 'w').write(new_content)
" "{PACKAGE}" "{LATEST}" "requirements.txt"

Cargo:

# Edit Cargo.toml version field for the package, then:
cargo update {package}

Go:

go get {module}@{latest_version}
go mod tidy

Ruby:

bundle update {gem_name}

3. Commit:

git add -A
git commit -m "chore(deps): update {RISK} dependencies $(date +%Y-%m-%d)"

4. Create PR:

cat > /tmp/dep-pr-body-{RISK}.md << 'ENDMD'
PR_BODY_FROM_GEMINI
ENDMD

gh pr create \
  --title "chore(deps): update {RISK} dependencies" \
  --body-file /tmp/dep-pr-body-{RISK}.md \
  --label "dependencies" \
  --base main

Major updates get label dependencies,breaking-change. CVE-fixing updates get label dependencies,security.

After each PR, return to main: git checkout main

---

Step 8: Diagnosis Mode

Trigger: If any package install command fails mid-run, enter Diagnosis Mode instead of stopping.

Detect the failure type:

Error pattern	Likely cause	Suggested fix
peer dep conflict	Peer dependency incompatibility	Show conflicting pair, suggest --legacy-peer-deps flag or downgrade
ERESOLVE	npm resolution conflict	Run npm install --legacy-peer-deps for the affected package only
version not found	Version does not exist in registry	Check registry with npm view {pkg} versions
python requires	Python version incompatibility	Note required Python version, skip package
cargo E0463	Rust edition incompatibility	Flag for manual review

Present a diagnosis summary:

Install failed for {package}: {error type}
Likely cause: {explanation}
Suggested fix: {specific command or action}
Remaining packages: proceeding with {N} that succeeded.

Do not stop the entire run when one package fails. Continue with packages that succeed.

---

Step 9: Output Summary

## Dependency Update Summary: [YYYY-MM-DD]

### Security
[CRITICAL] lodash: CVE-2021-23337 fixed in 4.17.21: PR #42
[HIGH] axios: CVE-2021-3749 fixed in 0.21.4: PR #42

| Risk Level | Packages | PR |
|------------|----------|-----|
| Patch | lodash 4.17.19→4.17.21, axios 0.21.1→0.21.4 | #42 |
| Minor | express 4.17.1→4.18.2 | #43 |
| Major | react 17.0.2→18.2.0 | #44 |

PRs opened: 3

Packages with no changelog: some-obscure-pkg (no GitHub repo in registry)
Install failures: none

Next action: Review major update PRs individually before merging.