Skills/PyPI/mcp-builder-forge

mcp-builder-forge@0.3.0

CAUTION· not started

Publisher claims: "The forge that builds MCP servers — Build, maintain and orchestrate MCP servers for Linux system administration" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher jacs-factory · publishing for 166 daysInstalls 14Last detonated 8d ago
What would fix thisWatchDispute verdict

Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

What this means for the label: Caution 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

Code inventory arrives with this version's next honeypot run.
It will ask for
unknown until the next run
Where it talks to
unknown until the next run
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Not enough was observed to say yet. Not started: dependency install failed; the server itself was not observed. This version's code has not been inventoried for credentials and hosts either; both arrive with its next honeypot run (popular servers first). `vet-skills try mcp-builder-forge` runs it now and prints the full answer.

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 (2 scenarios; not started: dependency install failed; the server itself was not observed) on 2026-11-07 and scored it 68/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Access to sensitive file paths; Access to sensitive file paths; Access to sensitive file paths. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1
0.1sprocessexec /usr/bin/date
0.1sprocessexec /usr/bin/timeout
0.1sprocessexec .venv/bin/mcp-builder-forge
0.1sclaimedno tools/list reply (exit 0)
0.2sprocessscript backend runs setup only
0.2sprocessno install scripts to re-run

Static findings

HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/suse.json:48 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/debian.json:22 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/rhel.json:81 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/suse.json:75 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
CRITICAL
OS command execution function call detectedpower/mcp-builder-power/hooks/validate-mcp-tools.json:8 · OS command execution function call detected"outputPrompt": "Review the saved Python file for MCP tool safety. Check ONLY functions decorated with @mcp.tool (or @server.tool, @app.tool). For each decorated tool function, validate:\n\n1. **No unFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/suse.json:21 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/rhel.json:22 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/rhel.json:108 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/hardening.py:144 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesdescription="Verify file permissions on security-sensitive paths. Checks ownership, mode bits, and SUID/SGID flags against hardening baselines for files like /etc/passwd, /etc/shadow, SSH keys, and crFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Privileged sudo commandsrc/mcp_builder_server/log_tools.py:90 · Privileged sudo command — agent may execute with elevated privilegesdescription=f"Read authentication log ({paths['auth']}). Shows login attempts, sudo usage, SSH connections, and PAM events.",Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/rhel.json:52 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathssrc/mcp_builder_server/data/distros/debian.json:50 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"sudoers": "/etc/sudoers.d",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Destructive file system command detectedtests/unit/test_security.py:54 · Destructive file system command detectedvalidate_no_shell_metacharacters("ls; rm -rf /", "cmd_field")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
LOW
Authorization escalation languagesrc/mcp_builder_server/data/distros/suse.json:28 · Authorization escalation language · informational: not an instruction file · informational: not an instruction file · informational: not an instruction file"Some zypper commands require root privileges"Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
Process kill commandsrc/mcp_builder_server/scaffolding.py:259 · Process kill command — agent can terminate processescheck = await executor.execute(f"kill -0 {{pid}} 2>/dev/null && echo RUNNING || echo DONE", timeout=5, raw=True)Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandsrc/mcp_builder_server/scaffolding.py:308 · Process kill command — agent can terminate processesresult = await executor.execute(f"kill -{{signal.upper()}} {{pid}}", timeout=5, raw=True)Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Python subprocess execution detectedpower/mcp-builder-power/hooks/validate-mcp-tools.json:8 · Python subprocess execution detected"outputPrompt": "Review the saved Python file for MCP tool safety. Check ONLY functions decorated with @mcp.tool (or @server.tool, @app.tool). For each decorated tool function, validate:\n\n1. **No unFix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
Destructive command against a filesystem root or devicetests/unit/test_tool_generator.py:227 · Destructive command against a filesystem root or devicevalidate_argument("cmd; rm -rf /")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Privileged sudo commandsrc/mcp_builder_server/scaffolding.py:217 · Privileged sudo command — agent may execute with elevated privilegesinner_cmd = f"sudo bash -l -c '{{command}}'" if sudo else f"bash -l -c '{{command}}'"Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Destructive file system command detectedtests/unit/test_tool_generator.py:227 · Destructive file system command detectedvalidate_argument("cmd; rm -rf /")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Access to sensitive file pathstests/unit/test_security.py:78 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesvalidate_no_shell_metacharacters("echo hi > /etc/passwd", "cmd")Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Destructive command against a filesystem root or devicetests/unit/test_security.py:54 · Destructive command against a filesystem root or devicevalidate_no_shell_metacharacters("ls; rm -rf /", "cmd_field")Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Python subprocess execution detectedsrc/mcp_builder_server/orchestrator.py:822 · Python subprocess execution detectedproc = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
HIGH
Privileged sudo commandsrc/mcp_builder_server/scaffolding.py:511 · Privileged sudo command — agent may execute with elevated privilegescmd = f"sudo {{cmd}}"Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05

Cost to the agent

Instructions loaded
≈67 tok
1 file · 81 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
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 mcp-builder-forge@0.3.0 as of 7d ago. This is the package itself, not its dependencies.

What would make this Verified

12 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. OS command execution function call detected≈ +9 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  2. Unclaimed publisher≈ +8 on the totalClaim jacs-factory: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  4. Privileged sudo command≈ +4 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  5. Destructive file system command detected≈ +2 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
  6. Process kill command≈ +2 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
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