Skills/PyPI/jquants-mcp

jquants-mcp@1.6.0

VERIFIED· not started

Publisher claims: "MCP server for retrieving Japanese stock market data via J-Quants API v2" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry PyPI (MCP server)Publisher shigechika · publishing for 230 daysInstalls 1,460Last detonated 5 h ago
$claude mcp add jquants-mcp -- uvx jquants-mcp
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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
FIRESTORE_TOKEN_STOREJQUANTS_API_KEYJQUANTS_TOKEN_FILEMCP_STDIO_SERVE_TOKENMCP_STDIO_SERVE_TOKEN_FILE or --auth-token / --enable-oauth / --access-token-ttl / --oauthConfiguration, not credentials: GCS_BUCKET, GCS_PREFIX, GCS_SYNC_INTERVAL, GOOGLE_CLOUD_PROJECT, JQUANTS_API_TOML_PATH, JQUANTS_CACHE_DIR, JQUANTS_CLOUD_RUN_SERVICE, JQUANTS_CLOUD_RUN_URL, JQUANTS_MCP_USER, JQUANTS_PLAN, K_SERVICE, NEW_KEY, OLD_KEY
Where it talks to
jquants.com, jpx-jquants.com (its own)Also aikawa.jp, claude.ai, meta.ai, run.app — not the publisher's domain; check what for before connecting.
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, and read the third-party hosts first. The code names aikawa.jp, claude.ai, meta.ai, run.app as well as its own vendor. The guard injects FIRESTORE_TOKEN_STORE, JQUANTS_API_KEY, JQUANTS_TOKEN_FILE, MCP_STDIO_SERVE_TOKEN, MCP_STDIO_SERVE_TOKEN_FILE only into requests to jquants.com (and its subdomains) and refuses the rest.

$vet-skills run --secrets FIRESTORE_TOKEN_STORE=jquants.com,JQUANTS_API_KEY=jquants.com,JQUANTS_TOKEN_FILE=jquants.com,MCP_STDIO_SERVE_TOKEN=jquants.com,MCP_STDIO_SERVE_TOKEN_FILE=jquants.com -- uvx jquants-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; not started: dependency install failed; the server itself was not observed) on 2026-11-14 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 · 0 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.1sprocessdependency install exit 1 ·
0.1sclaimednot started: dependency install failed (exit 1); the server itself was not observed
0.2sprocessscript backend runs setup only
0.2sprocessno install scripts to re-run

Static findings

MEDIUM
File type combined with upload actionscripts/gcs_sync.py:452 · File type combined with upload action — agent may exfiltrate local data filesmain .db file will be missing recent changes when uploaded to GCS.Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
Access to sensitive file pathscompose.yml:5 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# echo 'JQUANTS_API_KEY=xxx' > .envFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Python subprocess execution detectedscripts/collect_metrics.py:104 · Python subprocess execution detectedr = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
File type combined with upload actionCLAUDE.md:42 · File type combined with upload action — agent may exfiltrate local data files…orical data bulk fetch via J-Quants Bulk API - `gcs_sync.py` — Cloud Run cache.db startup download from GCS (`--init-cache`). Skips the download (and the atomic replace that always allocates a new inode, which would invalidate `CacheStore`…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
LOW
Instructs the agent to modify its persistent memory or instruction filesCHANGELOG.md:287 · Instructs the agent to modify its persistent memory or instruction files · informational: not an instruction file…hika/jquants-mcp/compare/v0.48.0...v0.48.1) (2026-06-09) ### Documentation * update Cloud Run sizing in CLAUDE.md to 2 vCPU + 8Gi ([#471](https://github.com/shigechika/jquants-mcp/issues/471)) …Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
Process kill commandscripts/entrypoint-compose.sh:91 · Process kill command — agent can terminate processeskill -TERM "${SERVE_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
File permission modification commandDockerfile:73 · File permission modification command — agent changes file ownership/permissions&& chown -R appuser:appuser /app /home/appuserFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
File permission modification commandDockerfile:43 · File permission modification command — agent changes file ownership/permissions&& chmod +x /usr/local/bin/supercronic \Fix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
Process kill commandscripts/entrypoint-stdio.sh:105 · Process kill command — agent can terminate processeskill -TERM "${GCS_DAEMON_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandscripts/entrypoint-stdio.sh:170 · Process kill command — agent can terminate processeskill -TERM "${GCS_DAEMON_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandscripts/entrypoint-compose.sh:135 · Process kill command — agent can terminate processeskill -TERM "${SUPERCRONIC_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Process kill commandscripts/entrypoint-stdio.sh:99 · Process kill command — agent can terminate processeskill -TERM "${SERVE_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Destructive file system command detectedDockerfile:46 · Destructive file system command detected&& rm -rf /var/lib/apt/lists/*Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
Access to sensitive file pathscompose.yml:9 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files# `docker compose` reads .env automatically, and .env is gitignored. PassingFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Python subprocess execution detectedscripts/collect_metrics.py:94 · Python subprocess execution detectedr = subprocess.run(Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
File permission modification commandDockerfile:59 · File permission modification command — agent changes file ownership/permissionsRUN chmod +x /app/scripts/entrypoint-compose.sh /app/scripts/entrypoint-stdio.shFix: Request the narrowest permission that works; replace wildcards with the exact paths or hosts.
AST05
MEDIUM
File type combined with upload actionscripts/entrypoint-stdio.sh:12 · File type combined with upload action — agent may exfiltrate local data files# 4. Start background GCS sync daemon (users.db + oauth_state.db upload only)Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
Process kill commandscripts/entrypoint-compose.sh:97 · Process kill command — agent can terminate processeskill -TERM "${SUPERCRONIC_PID}" 2>/dev/null || trueFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05

Cost to the agent

Instructions loaded
≈4,193 tok
2 files · 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 jquants-mcp@1.6.0 as of 4 h ago. This is the package itself, not its dependencies.