Skills/npm/hesperan-mcp

hesperan-mcp@0.1.0

VERIFIED

Publisher claims: "Calibrated decisions for agents: choice, yes/no and score questions answered with probabilities." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server) · listed in the official MCP RegistryPublisher hesperan · publishing for 51 daysInstalls 0Last detonated 5d ago
$claude mcp add hesperan-mcp -- npx -y hesperan-mcp
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Coverage

Server started and answered tools/list.
Tested
MCP initialize and tools/list · every tool description, for hidden instructions · every file read, file written and host contacted by what ran
Not tested
what the tools do when called with real credentials

Before you give it your token

It will ask for
HESPERAN_API_KEYConfiguration, not credentials: HESPERAN_BASE_URL, MISSING_KEY
Where it talks to
hesperan.com (its own)
What the honeypot saw
no credential files read · no network
What we could not test
what the tools do when called with real credentials

Connect it with a scoped credential, under the guard. It asks for HESPERAN_API_KEY and talks to hesperan.com. 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.

$vet-skills run --secrets HESPERAN_API_KEY=hesperan.com -- npx -y hesperan-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 (2 scenarios) on 2026-11-09 and scored it 92/100 (Verified). It did what it claims and nothing else we could detect: no undeclared network egress, no credential reads, no persistent instruction writes. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 23 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
2.8sprocessdependency install exit 0
23sclaimed3 tools: decide, decide_with_profile, report_outcome
23sprocessscript backend runs setup only
23sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagesrc/cli.js:25 · npx invocation of non-well-known package — may execute untrusted codeclaude mcp add hesperan --env HESPERAN_API_KEY=hsp_… -- npx -y hesperan-mcp`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

No other findings across 484 lines in 8 files.

Cost to the agent

Instructions loaded
≈62 tok
1 file · 8 in bundle
Tool list per prompt
≈1,245 tok
3 tools · 415 per tool
Handshake
285 ms
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 499

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 hesperan-mcp@0.1.0 as of 5d ago. This is the package itself, not its dependencies.