How to Evaluate Claude Tools
A practical framework for your team. Not legal advice — educational guidance you can adapt to your own security policies.
The 90-Second Check
Six questions before you go deeper. If any answer is a red flag, move on.
Who maintains it?
GitHub org or author profile
Anonymous or unidentifiable author
When was it last updated?
GitHub “pushed at” date
No commits in 6+ months
What license?
LICENSE file or GitHub sidebar
No license, or AGPL/GPL without legal review
How many dependencies?
package.json / requirements.txt
Hundreds of deps for a simple tool
Any known vulnerabilities?
npm audit or pip-auditCritical or high severity CVEs
Does it have a security policy?
SECURITY.md in the repo
No way to report vulnerabilities
Going Deeper
For tools you plan to deploy in production or with client data:
Review what it accesses
- What file system paths does it read or write?
- Does it need sensitive directories (
~/.ssh,~/.aws,.env)? - What network calls does it make? To which domains?
- Does it send data to third-party services?
Check the supply chain
- Are dependency versions pinned (exact versions, not ranges)?
- Is there a lockfile (package-lock.json, poetry.lock, Cargo.lock)?
- Does the published package match the GitHub source?
- Any known vulnerability advisories?
Evaluate the maintainer
- Official vendor tool or community-maintained?
- How many contributors? Single maintainer = bus factor risk.
- How quickly do they respond to issues and security reports?
Test in isolation
- Install in a sandboxed environment first
- Monitor network traffic during first use
- Review what files it creates or modifies
- Test with non-sensitive data first
Red Flags
- No license file — Without a license, you have no legal right to use the software.
- Broad filesystem access — Read/write to your entire home directory without clear justification.
- Unknown outbound domains — Legitimate tools call well-known APIs. Unknown endpoints are suspicious.
- Obfuscated source — If you can’t read the code and there’s no build pipeline, you can’t evaluate it.
- Single maintainer, no security policy — No way to report vulnerabilities responsibly.
- Stale API wrappers — A tool wrapping external APIs that hasn’t been updated in 12+ months.
- Runtime code downloading — Fetching and executing code at runtime is an additional attack vector.
Enterprise Considerations
- Data residency — Where does the tool process data? Does it meet your residency requirements?
- Claude subscription tier — Enterprise and Team plans include data processing agreements. Confirm your tier.
- Vendor support — Official tools (Atlassian, Stripe, AWS) have enterprise support. Community tools do not.
- Compliance — Regulated industries should confirm no compliance gaps are introduced.
- Exit strategy — Can you remove the tool without losing data or breaking workflows?
Quick Reference
| Audit npm dependencies | npm audit |
| Audit Python dependencies | pip-audit |
| Count dependencies | jq '.dependencies | length' package.json |
| Find outbound URLs | grep -rn 'https://' src/ |
| Check for security policy | Look for SECURITY.md in repo root |
This guide is educational information, not legal advice or security certification. Organizations should consult their own security and legal teams before making deployment decisions.