esp32_nat_router (martin-ger/esp32_nat_router) is an MCP server listed on the M8ven Trust Index. It scores 68 out of 100, grade C. It declares 37 tools. No publisher has claimed this listing.

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C
Caution
68/100

esp32_nat_router

An AI-enabled NAT Router/Firewall for the ESP32

→ martin-ger/esp32_nat_router· listed on github_topic

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

How we verified

⚡ Live Monitored: not connected

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Who stands behind it

martin-ger

Source: github_topic · also listed on github_repo_search

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GitHub

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
⚠️
Tool descriptions don’t match what handlers do
1 tool describes read intent but its handler mutates — network_trace (line 926: shutil.copy2(tmp.name, save_pcap_path))
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
🔐
You'll be asked for 1 credential: ESP_NAT_PASSWORD
These are read from process.env at runtime. Make sure you trust where they’ll be sent.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configESP_NAT_HOST
configESP_NAT_PORT
🔐 secretESP_NAT_PASSWORD
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

37/37 tools missing one or more hints — show_status (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); show_config (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); show_mappings (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +34 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Destructive tools are labelled

2 tools perform destructive updates without destructiveHint — network_trace deletes at line 982 (os.unlink(tmp.name)); pcap_save deletes at line 1133 (os.unlink(tmp.name))

Add destructiveHint:true to any tool whose handler calls .delete(), .upsert(), .update(), unlink, rm, DELETE, DROP, REPLACE INTO, or any operation that overwrites existing data.

Descriptions match behaviour

1 tool describes read intent but its handler mutates — network_trace (line 926: shutil.copy2(tmp.name, save_pcap_path))

Rename the tool, rewrite the description, or move the side-effect into a separate clearly-named tool.

License file

No license file

Add a LICENSE file (MIT, Apache-2.0, etc.).

Tests exist

No test files found

Add tests that exercise each declared tool.

Tool description accuracy

network_trace: description implies read-only but handler writes/deletes/executes

Update tool descriptions to accurately reflect all capabilities — especially write, delete, or execute operations.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 7 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Verified](https://m8ven.ai/badge/mcp/martin-ger/esp32_nat_router?variant=verified)](https://m8ven.ai/mcp/martin-ger/esp32_nat_router)
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commit: 1157ae2c0a53c543a2ec6f75cb5383a39e8f9ce9
code hash: 573b4525346eef84a6e05b84347a5756746c471b3c7b4c0d37b65f06b0d8f4ca
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