Skills/npm/signer

signer@0.14.0-alpha.0

VERIFIED· not started

Publisher claims: "Haven edge signer — holds the agent's delegate key locally and signs payment hashes + x402 headers. Pairs with the hosted, keyless @haven_ai/mcp-server; the key never leaves the machine." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher haven_ai · publishing for 172 daysInstalls 11,965Last detonated 32 h ago
$claude mcp add signer -- npx -y @haven_ai/signer
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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: 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
HAVEN_CREDENTIALSConfiguration, not credentials: HAVEN_AGENT_ID, HAVEN_CHAIN_ID, HAVEN_DELEGATE_KEY, HAVEN_NETWORK, HAVEN_X402_BINDING_SIGNER
Where it talks to
no vendor host named in the code
What the honeypot saw
no credential files read · no network
What we could not test
server startup · the tool list · tool behavior

Connect it with a scoped credential, under the guard. It asks for HAVEN_CREDENTIALS and talks to its vendor. Give the credential to the guard, not the server: the value never enters the server's environment and only travels to the host you bind. What the tools do with a real credential was not observed.

$vet-skills run --net declared -- npx -y @haven_ai/signer

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 2026-11-13 and scored it 87/100 (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: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 62 s · 2 scenarios
t+CategoryObserved action
0.0sprocessno install scripts in bundle
60sprocessdependency install exceeded 60s
60sclaimednot started: dependency install timed out; the server itself was not observed
60sprocessscript backend runs setup only
60sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagedist/index.cjs:2639 · npx invocation of non-well-known package — may execute untrusted code…+ " See the consent block above; if the Haven connector wired this signer, run: npx @haven_ai/connect --doctor" ); err.code = "HAVEN_SIGNER_NO_CONSENT"; throw err;…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File permission modification commanddist/cli.cjs:144 · File permission modification command — agent changes file ownership/permissions`haven-signer: warning: ${kind} at ${path} is readable beyond the owner (mode ${found.octal}) and could not be tightened. Run: chmod 600 ${path}`Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli.cjs:2440 · npx invocation of non-well-known package — may execute untrusted code" npx @haven_ai/signer --credentials /path/to/agent.json",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File permission modification commanddist/index.js:1087 · File permission modification command — agent changes file ownership/permissions`haven-signer: warning: ${kind} at ${path} is readable beyond the owner (mode ${found.octal}) and could not be tightened. Run: chmod 600 ${path}`Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
File permission modification commanddist/cli.js:3 · File permission modification command — agent changes file ownership/permissionsimport { readFile, mkdir, writeFile, lstat, rename, appendFile, chmod } from 'fs/promises';Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
npx invocation of non-well-known packagedist/index.js:445 · npx invocation of non-well-known package — may execute untrusted code….message : String(err)}. The signer's runtime install is incomplete \u2014 run: npx @haven_ai/connect --doctor` ); } } function assertX402PaymentWindowOpen(expected) { if (!…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.cjs:2279 · npx invocation of non-well-known package — may execute untrusted code"Wired by the Haven connector (Claude Desktop, Codex, ...)? Diagnose and repair with: npx @haven_ai/connect --doctor",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.cjs:2407 · npx invocation of non-well-known package — may execute untrusted codevar CONNECTOR_DOCTOR_COMMAND = "npx @haven_ai/connect --doctor";Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.cjs:2697 · npx invocation of non-well-known package — may execute untrusted code…+ " See the consent block above; if the Haven connector wired this signer, run: npx @haven_ai/connect --doctor" ); err.code = "HAVEN_SIGNER_NO_CONSENT"; throw err;…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.js:2277 · npx invocation of non-well-known package — may execute untrusted code"Wired by the Haven connector (Claude Desktop, Codex, ...)? Diagnose and repair with: npx @haven_ai/connect --doctor",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File permission modification commanddist/index.d.ts:386 · File permission modification command — agent changes file ownership/permissions* symlink would make chmod hit whatever it points at) or when chmod isFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli.js:547 · npx invocation of non-well-known package — may execute untrusted code….message : String(err)}. The signer's runtime install is incomplete \u2014 run: npx @haven_ai/connect --doctor` ); } } function assertX402PaymentWindowOpen(expected) { if (!…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.js:2695 · npx invocation of non-well-known package — may execute untrusted code…+ " See the consent block above; if the Haven connector wired this signer, run: npx @haven_ai/connect --doctor" ); err.code = "HAVEN_SIGNER_NO_CONSENT"; throw err;…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.cjs:549 · npx invocation of non-well-known package — may execute untrusted code….message : String(err)}. The signer's runtime install is incomplete \u2014 run: npx @haven_ai/connect --doctor` ); } } function assertX402PaymentWindowOpen(expected) { if (!…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File permission modification commanddist/index.cjs:1088 · File permission modification command — agent changes file ownership/permissions`haven-signer: warning: ${kind} at ${path} is readable beyond the owner (mode ${found.octal}) and could not be tightened. Run: chmod 600 ${path}`Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
npx invocation of non-well-known packagedist/index.js:2638 · npx invocation of non-well-known package — may execute untrusted code…+ " See the consent block above; if the Haven connector wired this signer, run: npx @haven_ai/connect --doctor" ); err.code = "HAVEN_SIGNER_NO_CONSENT"; throw err;…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/index.cjs:2427 · npx invocation of non-well-known package — may execute untrusted code"Wired by the Haven connector (Claude Desktop, Codex, ...)? Diagnose and repair with: npx @haven_ai/connect --doctor",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/index.js:2426 · npx invocation of non-well-known package — may execute untrusted code"Wired by the Haven connector (Claude Desktop, Codex, ...)? Diagnose and repair with: npx @haven_ai/connect --doctor",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/index.cjs:446 · npx invocation of non-well-known package — may execute untrusted code….message : String(err)}. The signer's runtime install is incomplete \u2014 run: npx @haven_ai/connect --doctor` ); } } function assertX402PaymentWindowOpen(expected) { if (!…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.js:2438 · npx invocation of non-well-known package — may execute untrusted code" npx @haven_ai/signer --credentials /path/to/agent.json",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File permission modification commanddist/cli.js:142 · File permission modification command — agent changes file ownership/permissions`haven-signer: warning: ${kind} at ${path} is readable beyond the owner (mode ${found.octal}) and could not be tightened. Run: chmod 600 ${path}`Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli.js:2405 · npx invocation of non-well-known package — may execute untrusted codevar CONNECTOR_DOCTOR_COMMAND = "npx @haven_ai/connect --doctor";Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈86 tok
1 file · 9 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 @haven_ai/signer@0.14.0-alpha.0 as of 30 h ago. This is the package itself, not its dependencies.