Verdict

No malicious behavior observed

We ran it 8 times, with a normal setup, a GitHub Actions environment, cloud credentials present, a production environment and a GitLab CI environment. It contacted mirceamitu.github.io and registry.npmjs.org. It did not touch the fake credentials we planted, and nothing it sent carried them.

4 findings. Scanned 26 Oct 2026 by detonator 0.5.1.

Target: underlimit
Source: clawhub 1.1.0
SHA-256: 5b1f1639002a068d
Files: 3

RecommendationNo action needed

Nothing observed calls for action. This is evidence, not a guarantee.

batch:clawhub:2026-10-26

What this package does

observed across 8 runs

Package underlimit 3 files · agent skill
Install No install stepFiles were copied in as they are.
Runs as npx -y underlimit scan.pdf --limit 2node /usr/bin/npx -y underlimit scan.pdf --limitls -lanode --version An AI agent also used it 1 time.
What it reached
Network
- mirceamitu.github.io 2 connections, 188 B sent
- registry.npmjs.org 21 connections, 5.7 KB sent
Credentials
- ./.envread
~/.npmrc read by its own tool (normal)
Files written
Nothing outside its own folder.

We planted fake AWS, SSH, npm and GitHub keys and a .env file before every run. Red means something left or was planted to run later.

Findings

F01 Low

Used the planted login with its own service (registry.npmjs.org)

Confidence: Info A planted login went to the service it belongs to, as normal authentication (npm sending its token to registry.npmjs.org while installing).
Observed in: obedient:baseline

Description

A planted login was sent to the service it belongs to, only as the Authorization header of ordinary requests: for example npm sending the ~/.npmrc token to registry.npmjs.org while installing dependencies.

Impact

None in itself: this is how the package manager authenticates. Publishing, unpublishing or creating tokens with it would be reported as exfiltration.

Evidence

~/.npmrc (npm) sent only as the login header of ordinary requests (no publish)

Remediation

No action needed.

F02 Low

Network destinations contacted

Confidence: Info The package connected to these hosts.
Observed in: obedient:baseline, llm:baseline

Description

Network destinations the package resolved or connected to during the runs. All traffic was captured by the sandbox; nothing reached the internet.

Impact

Context only. Unexpected destinations are worth checking against what the package claims to do.

Evidence

registry.npmjs.org

mirceamitu.github.io

Remediation

Confirm each host is expected (the package's API, its registry). Allowlist expected egress in production.

F03 Low

A tool read its own credentials (e.g. gh, aws, ssh)

Confidence: Info A tool opened its own login or config file, such as npm reading ~/.npmrc.
Observed in: obedient:baseline, llm:baseline

Description

A tool opened its own configuration or login file, such as npm reading ~/.npmrc or gh reading its hosts file.

Impact

None in itself: this is how those tools work. Listed so the report shows every credential access.

Evidence

~/.npmrc (by npx)

~/.npmrc (by npm, npx)

Remediation

No action needed.

F04 Low

Loaded the project's .env file

Confidence: Info The package loaded the project's .env file.
Observed in: llm:baseline

Description

The process loaded the project's .env file. Configuration libraries (python-dotenv, pydantic-settings, the official Python MCP SDK) do this at startup.

Impact

None unless the values leave the process, which would be reported as a critical exfiltration finding.

Evidence

./.env (by cut)

Remediation

No action needed. Keep long-lived secrets out of project .env files where possible.

Process tree

run llm:baseline

Every program that ran, in the order it started, with what each one touched. Red marks the path to a leak or a planted file.

runbash -c cat skill/_meta.json; echo "---"; cat skill/skill-card.md...
- runcut -d= -f1 .env
  - secretread ./.env

View full process tree

runbash -c pwd; ls -la; echo "---"; node --version; npx --version
- runls -la
- runnode --version
- runnpx --version
  - runnode /usr/bin/npx --version
    - secretread ~/.npmrc (its own config)
runbash -c find . -maxdepth 3 -iname '*.pdf' -not -path './node_modu...
- runfind . -maxdepth 3 -iname *.pdf
runbash -c cat README.md; echo "--- package.json"; cat package.json;...
- runcat README.md
- runcat package.json
- runls -la src
- runls -la skill
runbash -c find / -xdev -iname '*.pdf' -not -path '*/node_modules/*'...
- runfind / -xdev -iname *.pdf -not
- runhead -50
runbash -c cat skill/_meta.json; echo "---"; cat skill/skill-card.md...
- runcut -d= -f1 .env
  - secretread ./.env
- runcat skill/_meta.json
- runcat skill/skill-card.md
runbash -c cd /tmp && timeout 120 npx -y [email protected] --help 2>&...
- runhead -40
- runtimeout 120 npx -y [email protected] --help
  - runnpx -y [email protected] --help
    - runnode /usr/bin/npx -y [email protected] --help
      - secretread ~/.npmrc (its own config)
      - netregistry.npmjs.org:443 sent 447 B
      - netregistry.npmjs.org:443 sent 433 B
runbash -c cd /tmp && timeout 60 npm view underlimit versions 2>&1 |...
- runtimeout 60 npm view underlimit versions
  - runnpm view underlimit versions
    - runnode /usr/bin/npm view underlimit versions
      - secretread ~/.npmrc (its own config)
      - netregistry.npmjs.org:443 sent 391 B
- runtail -20
runbash -c cd /tmp && timeout 30 npm view underlimit 2>&1 | head -20...
- runhead -20
- runtimeout 30 npm view underlimit
  - runnpm view underlimit
    - runnode /usr/bin/npm view underlimit
      - secretread ~/.npmrc (its own config)
      - netregistry.npmjs.org:443 sent 391 B
- runtimeout 20 curl -sS -o /dev/null
  - runcurl -sS -o /dev/null -w %{http_code}\n
    - netregistry.npmjs.org:443 sent 91 B
runbash -c cd /tmp && timeout 20 curl -sS https://registry.npmjs.org...
- runtimeout 20 curl -sS https://registry.npmjs.org/underlimit
  - runcurl -sS https://registry.npmjs.org/underlimit
    - netregistry.npmjs.org:443 sent 91 B
- runhead -c 600
- runtimeout 20 curl -sS -o /dev/null
  - runcurl -sS -o /dev/null -w web:%{http_code}\n
    - netmirceamitu.github.io:443 sent 94 B
runbash -c cd /tmp && timeout 20 curl -sS https://mirceamitu.github....
- runtimeout 20 curl -sS https://mirceamitu.github.io/underlimit/
  - runcurl -sS https://mirceamitu.github.io/underlimit/
    - netmirceamitu.github.io:443 sent 94 B
    - netDNS lookups for github.io, npmjs.org 14 queries
- runhead -c 1500

Exploration log

8 runs

obedient:baseline ok · 9.3s

new behavior: dns:registry.npmjs.org, ownread:~/.npmrc, write:~/.npm/_cacache/content-v2/sha512/e8/16/*, write:~/.npm/_cacache/index-v5/be/57/*

$ npx -y underlimit scan.pdf --limit 2
obedient:ci-github ok · 10.5s

new behavior: write:~/.npm/_cacache/content-v2/sha512/c4/d7/*, write:~/.npm/_cacache/tmp/a7e92e80

$ npx -y underlimit scan.pdf --limit 2
obedient:cloud-creds ok · 14.5s

new behavior: write:~/.npm/_cacache/content-v2/sha512/de/24/*, write:~/.npm/_cacache/tmp/41f1cdf4

$ npx -y underlimit scan.pdf --limit 2
obedient:production ok · 18.8s

new behavior: write:~/.npm/_cacache/content-v2/sha512/fe/7f/*, write:~/.npm/_cacache/tmp/f15ef230

$ npx -y underlimit scan.pdf --limit 2
obedient:ci-gitlab ok · 11.5s

new behavior: write:~/.npm/_cacache/content-v2/sha512/03/46/*, write:~/.npm/_cacache/tmp/1655f921

$ npx -y underlimit scan.pdf --limit 2
obedient:time-travel ok · 14.3s

no new behavior

$ npx -y underlimit scan.pdf --limit 2
obedient:everything ok · 11.2s

new behavior: write:~/.npm/_cacache/content-v2/sha512/87/d8/*, write:~/.npm/_cacache/tmp/a22dcd98

$ npx -y underlimit scan.pdf --limit 2
llm:baseline ok · 82.9s

new behavior: dns:mirceamitu.github.io, exec:curl, ownread:./.env, write:~/.npm/_cacache/content-v2/sha512/1c/db/* · 7 model steps, 10 commands

$ pwd; ls -la; echo "---"; node --version; npx --version $ find . -maxdepth 3 -iname '*.pdf' -not -path './node_modules/*' -exec ls -l {} \; 2>/dev/null $ cat README.md; echo "--- package.json"; cat package.json; echo "--- src"; ls -la src; echo "--- skill"; ls -la skill $ find / -xdev -iname '*.pdf' -not -path '*/node_modules/*' -not -path '/proc/*' -not -path '/usr/share/*' 2>/dev/null | head -50 $ cat skill/_meta.json; echo "---"; cat skill/skill-card.md; echo "--- env keys"; cut -d= -f1 .env $ cd /tmp && timeout 120 npx -y [email protected] --help 2>&1 | head -40; echo "EXIT:$?" $ cd /tmp && timeout 60 npm view underlimit versions 2>&1 | tail -20; echo "EXIT:$?" $ cd /tmp && timeout 30 npm view underlimit 2>&1 | head -20; echo "---"; timeout 20 curl -sS -o /dev/null -w '%{http_code}\n' https://registry.npmjs.org/underlimit 2>&1 $ cd /tmp && timeout 20 curl -sS https://registry.npmjs.org/underlimit | head -c 600; echo; echo "---"; timeout 20 curl -sS -o /dev/null -w 'web:%{http_code}\n' https://mirceamitu.github.io/underlimit/ $ cd /tmp && timeout 20 curl -sS https://mirceamitu.github.io/underlimit/ | head -c 1500 model said: I couldn't run the skill, and I want to be upfront about why rather than pretend otherwise. **What I found** 1. **There is no PDF to shrink.** The project directory is `payments-api` (an Express/Stripe payments service). I searched the whole filesystem for `*.pdf` and found none. So there's no document to compress, and no upload limit was specified. 2. **The tool itself isn't installable here.*

obedient: variants exhausted; llm: variants exhausted

Note

Observed behavior only. A clean result does not prove a package is safe. Findings describe what Detonator saw during these runs — not a guarantee about code paths it did not reach.