Is fabric-mcp@1.8.0 safe to install?

fabric-mcp@1.8.0

VERIFIED· startup only

Publisher claims: "Microsoft Fabric MCP Server - Model Context Protocol implementation for Fabric" Observed in sandbox: calls registry.npmjs.org only, touches nothing outside the project, writes no memory.

Registry npm (MCP server) · listed in the official MCP RegistryPublisher microsoft · publishing for 1195 daysInstalls 13,478Last detonated 3d ago

$claude mcp add fabric-mcp -- npx -y @microsoft/fabric-mcp

Watch Report an issue

Coverage

Startup only; authenticated tool behavior not tested.

Tested: install scripts, with decoy credentials in place · second launch with the clock 45 days ahead · server startup over stdio (initialize sent) · every file read, file written and host contacted by what ran
Not tested: the tool list (the server exited before answering) · what the tools do when called with real credentials

What this means for the label: Verified here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for: no credential variables read in the code
Where it talks to: no vendor host named in the codeAlso aka.ms — not the publisher's domain; check what for before connecting.
What the honeypot saw: no credential files read · reached only registry.npmjs.org
What we could not test: the tool list (the server exited before answering) · what the tools do when called with real credentials

Connect it under the guard. Startup only; authenticated tool behavior not tested. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- npx -y @microsoft/fabric-mcp

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (3 scenarios; startup only; authenticated tool behavior not tested) on 2026-11-11 and scored it 86/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: calls registry.npmjs.org only, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 20 s · 3 scenarios

t+CategoryObserved action

0.1sprocessexited 1: Missing required package: '@microsoft/fabric-mcp-linux-x64'. Follow the troubleshooting steps - https://aka.ms/azmcp/troubleshooting#platform-package-installation-issues

20sfilesystemwrote ~/.net/fabmcp/34f/libmsalruntime.so

20snetworkCONNECT tcp://registry.npmjs.org:443

20sprocessexec /usr/local/bin/npm

20sprocessexec /tmp/ks-detonate-p4WjCI/task/home/work/acme-api/.claude/skills/fabric-mcp/.platform/node_modules/@microsoft/fabric-mcp-linux-x64/dist/fabmcp

20sclaimedstartup only: exited (0) before answering · at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Program+<Main>d__1, fabmcp, Version=1.8.0.0, Culture=neutral, PublicKeyToken=null]](<Main>d__1 ByRef) at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[[System.Int32, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Start[[Program+<Main>d__1, fabmcp, Version=1.8.0.0, Culture

20sprocessscript backend runs setup only

20sprocesssecond launch, clock +45 days, CI unset

20sprocessexited 1: Missing required package: '@microsoft/fabric-mcp-linux-x64'. Follow the troubleshooting steps - https://aka.ms/azmcp/troubleshooting#platform-package-installation-issues

Static findings

MEDIUM

npx invocation of non-well-known packageindex.js:280 · npx invocation of non-well-known package — may execute untrusted codeconsole.error(` npx -y ${packageName}@latest --version`)Fix: Pin versions and sources; vendor anything fetched at install time.

AST06

MEDIUM

npx invocation of non-well-known packageindex.js:278 · npx invocation of non-well-known package — may execute untrusted codeconsole.error(`\n3. If using npx, clear the npx cache and try again:`)Fix: Pin versions and sources; vendor anything fetched at install time.

AST06

LOW

Authorization escalation languageREADME.md:364 · Authorization escalation language · informational: not an instruction file

| `core_delete-workspace` | Deletes one explicitly identified Fabric workspace **and the items under it**. Requires a workspace UUID and workspace Admin access. |

Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

Authorization escalation languageREADME.md:365 · Authorization escalation language · informational: not an instruction file

…` | Deletes one existing assignment by workspace and assignment UUIDs. Requires Admin access; returns a deletion receipt without identity lookup, cascading removal, retry, …

Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

False authorization claimREADME.md:160 · False authorization claim — impersonating privileged role · informational: not an instruction file* "List my Fabric workspaces where I am an Admin or Member"Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

Authorization escalation languageREADME.md:385 · Authorization escalation language · informational: not an instruction file

| `core_update-workspace` | Renames a workspace or updates or clears its description by UUID, leaving omitted properties unchanged. Requires workspace Admin access. |

Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

Authorization escalation languageREADME.md:245 · Authorization escalation language · informational: not an instruction filenot the principal, group membership, workspace, or all sources of effective access. It requires AdminFix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

MEDIUM

npx invocation of non-well-known packageindex.js:279 · npx invocation of non-well-known package — may execute untrusted codeconsole.error(` npx -y clear-npx-cache`)Fix: Pin versions and sources; vendor anything fetched at install time.

AST06

LOW

False authorization claimREADME.md:145 · False authorization claim — impersonating privileged role · informational: not an instruction file* "List Fabric capacities where I am an administrator or contributor"Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

Authorization escalation languageREADME.md:242 · Authorization escalation language · informational: not an instruction fileassignment with one PATCH. It requires Admin access and an explicit role, without identity translation,Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

LOW

Coercive compliance languageREADME.md:2244 · Coercive compliance language · informational: not an instruction file

…oft to collect data from users of your applications. If you use these features, you must comply with applicable law, including providing appropriate notices to users of your a…

Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.

AST01

Cost to the agent

Instructions loaded

≈57 tok

1 file · 6 in bundle

Tool list per prompt

≈0 tok

0 tools · 0 per tool

Handshake

no reply

launch to tools/list, stdio

Undocumented tools

description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for @microsoft/fabric-mcp@1.8.0 as of 3d ago. This is the package itself, not its dependencies.