Fiddler-MCP-Server (lucas-link-code/Fiddler-MCP-Server) is an MCP server listed on the M8ven Trust Index. It scores 74 out of 100, grade C. It declares 10 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
74/100

Fiddler-MCP-Server

Provides agent chat for analysing Fiddler traffic using LLM models through MCP server and custom tools with robust python harness.

→ lucas-link-code/Fiddler-MCP-Server· listed on github_repo_search

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

Verified is a snapshot. Live keeps it current, and builds your track record.

⚡ Connect GitHub → continuous verification on every pushwhy connect →

Who stands behind it

lucas-link-code

Source: github_repo_search

Is this your MCP?

Claim it to get a verified publisher badge, a free copy of our full audit findings, and direct contact for any high-priority issues we find. Or connect your repo for our deepest verification, Live Monitored: read-only, revoke anytime. What we access →

⚡ Connect GitHub for Live Monitored

Install from

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 — fiddler_mcp__session_body (line 1070: - "High: JavaScript obfuscation" -> Check for eval(), string arrays)
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
🔐
You'll be asked for 3 credentials: DEEPSEEK_API_KEY, OPENROUTER_API_KEY, GEMINI_API_KEY
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.
configFIDDLER_KEEP_QUICK_EDIT
configGRPC_VERBOSITY
configGRPC_TRACE
configFIDDLER_DISABLE_QUICK_EDIT
configGEMINI_SKIP_DEP_INSTALL
🔐 secretDEEPSEEK_API_KEY
🔐 secretOPENROUTER_API_KEY
configGEMINI_FIDDLER_VERBOSE_LOG
configGEMINI_TOOL_TIMEOUT
configGEMINI_API_TIMEOUT
configGEMINI_HIDE_PROGRESS
configGEMINI_VERBOSE_PROGRESS
configGEMINI_MAX_TOOL_CALLS
configFIDDLER_BRIDGE_URL
configGEMINI_NATIVE_TOOLS
🔐 secretGEMINI_API_KEY
configLLM_PROVIDER
configGEMINI_MODEL
configDEEPSEEK_MODEL
configOPENROUTER_MODEL
configDEEPSEEK_BASE_URL
configOPENROUTER_BASE_URL
configGEMINI_AUTO_SAVE_FULL_BODIES
configDEEPSEEK_SSL_VERIFY
configOPENROUTER_SSL_VERIFY
configDEEPSEEK_HTTP_TIMEOUT
configOPENROUTER_HTTP_TIMEOUT
configOPENROUTER_APP_TITLE
// 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

10/10 tools missing one or more hints — fiddler_mcp__live_sessions (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); fiddler_mcp__sessions_search (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); fiddler_mcp__session_headers (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +7 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.

Descriptions match behaviour

1 tool describes read intent but its handler mutates — fiddler_mcp__session_body (line 1070: - "High: JavaScript obfuscation" -> Check for eval(), string arrays)

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.).

Secrets not logged

1 secret value sent to print

Redact or omit secret values from log output.

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 5 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/lucas-link-code/fiddler-mcp-server?variant=verified)](https://m8ven.ai/mcp/lucas-link-code/fiddler-mcp-server)
Shows verification status without the grade. Want the grade badge instead? Remove ?variant=verified from the URL.
commit: 34946d7c2bde9050a772207fc2f307e1d1564517
code hash: ec7f49bce9859b40c1b6a97dfdbffeda332a08a80cb7578336d031e50fe8d66f
view raw JSON →
Check MCPs from inside your assistant
Tool Check · MCP

Vetting this one by hand? Tool Check is an MCP that scores other MCPs. Add it once and ask Claude, ChatGPT, or any MCP client to grade a server, surface CVEs, check the publisher, and suggest safer alternatives — before you install.

https://m8ven.ai/api/mcp/tool-check
check_toolsearch_toolscompare_toolsrecommend_alternativescheck_publisherreport_concern
How to add it →Free · no account needed · works in any MCP client