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Sandbox Internet Handler · stijnman | DecimalAI

securityby stijnman

Sandbox Internet Handler

stijnman/sandbox-internet-handler

Source stijnman/grok-custom-skills ↗License MIT

Fetches web content in a sandboxed, read-only manner.

SkillScore95Maintained

Automatic

Security & AppSec pack

Last verified 8/15/2026

What it changes

Passed 21 of 22 test cases with the skill, and 16 of 22 without it.

Without skill73%

With skill95%

Checks it passed that the model alone missed

Validates that the URL scheme uses HTTPS.
Enforces a payload size limit during fetching.
Strips script elements from the returned output.

and 3 more in the full report

6 fixed15 passed either way0 still failing1 broke

Pass-rate lift: +23 pp
Tokens: -38%
Agent turns: 0%
Response time: -53%

Model gemini-3.6-flashMeasured 8/15/2026v221 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/stijnman-sandbox-internet-handler/SKILL.md https://app.decimal.ai/s/stijnman-sandbox-internet-handler/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add stijnman-sandbox-internet-handler, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/stijnman-sandbox-internet-handler/ and pins it in .decimal/skills.lock

decimalai skills add stijnman-sandbox-internet-handler

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/stijnman-sandbox-internet-handler/SKILL.md https://app.decimal.ai/s/stijnman-sandbox-internet-handler/SKILL.md

Raw file: /s/stijnman-sandbox-internet-handler/SKILL.md ↗ · machine-readable summary at /s/stijnman-sandbox-internet-handler.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 6

Prompt

I need to fetch documentation from http://legacy-docs.internal.net/setup-guide to grab the raw content. Please retrieve it using the safe web handler.

What was checked, without and with the skill
Checked	Without skill	With skill
Rejects the URL fetch request because it uses HTTP instead of HTTPS.	Missed	Passed

case-04 · gemini-3.6-flash · 8/15/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md34 linessingle file

Sandbox Internet Handler

When to Use

User says sandbox fetch or task matches this capability
User says safe web access or task matches this capability
User says fetch URL safely or task matches this capability

Workflow

Validate URL scheme (https only).
Fetch with timeout and size limit.
Strip scripts; return text/markdown only.
Flag suspicious content; do not execute embedded code.

Integrations

internet-enabler
web-scraper
privacy-redactor

Error Handling

Failure	Response
Timeout	Report partial content or suggest alternate source.

Gotchas

Never pass fetched HTML to exec or eval.

Example

Input: User request matching triggers above. Output: Structured result per workflow with integrations invoked as needed.

Track record

Benchmark

21 / 22

test cases passed, vs 16 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 8/15/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

stijnman / grok-custom-skills

.grok/skills/sandbox-internet-handler/SKILL.md

View on GitHub ↗

License MITImported 8/15/2026Version v2

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Sandbox Internet Handler

When to Use

Workflow

Integrations

Error Handling

Gotchas

Example

Track record

Benchmark

Adoption

SkillSafety

Source

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