MCP, MCP server
Simmer
Simmer is the leading prediction market harness for AI agents.
Compatibility: Not stated.
Grade D
Two or more Medium findings, or a High finding. Only try it in a sandbox.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
INSTALL_REMOTE_SCRIPT AGENT_HIDDEN_STEP SECRETS_PATH_CREDENTIAL
Why this grade
- INSTALL_REMOTE_SCRIPT High
Fetches a script from the network and runs it (a pipe to a shell, or an install hook with a URL).
mcp/bundled-skills/simmer-wallet-setup/SKILL.md, line 46
curl -fsSL https://docs.openwallet.sh/install.sh | bash # one-time OWS install - AGENT_HIDDEN_STEP High
Text tells the agent to hide a step or not to tell the user.
mcp/bundled-skills/simmer-mcp-setup/SKILL.md, line 638
- **Don't tell the user "it should work now" without verifying.** Run Step 6 - confirm a real tool call returns real data. - SECRETS_PATH_CREDENTIAL Medium
Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).
skills/polymarket-mil-aircraft-tracker/SKILL.md, line 62
cred = Path.home() / ".config" / "preference" / "credentials.json"
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Concern
can delete files.
PERMISSION_DELETE_FILES
mcp/scripts/bundle-skills.ts, line 121
if (fs.existsSync(targetDir)) fs.rmSync(targetDir, { recursive: true });
mcp/scripts/bundle-skills.ts, line 165
fs.rmSync(tmpDir, { recursive: true, force: true });
scripts/check-skill-governance.py, line 356
return subprocess.check_output(["git", *args], cwd=ROOT, text=True).strip()
Show more
scripts/check_publish_lag.py, line 201
return subprocess.check_output(["git", *args], cwd=root, text=True).strip()
scripts/sync_replay_engine.py, line 85
out = subprocess.check_output(
simmer_sdk/test_skill.py, line 120
proc = subprocess.run(
simmer_sdk/backtest/tape.py, line 209
shutil.rmtree(slice_dir, ignore_errors=True)
simmer_sdk/backtest/replay/harness.py, line 217
proc = subprocess.run(
simmer_sdk/backtest/replay/harness.py, line 253
shutil.rmtree(strategy.workdir, ignore_errors=True) # holistic-review P1: don't leak workdirs across jobs
skills/polymarket-wallet-xray/SKILL.md, line 179
result = subprocess.run(
skills/polymarket-wallet-xray/SKILL.md, line 209
result = subprocess.run(
skills/polymarket-wallet-xray/SKILL.md, line 229
result = subprocess.run(
Install and update
Serious
install fetches a script from the network.
INSTALL_REMOTE_SCRIPT
mcp/bundled-skills/simmer-wallet-setup/SKILL.md, line 46
curl -fsSL https://docs.openwallet.sh/install.sh | bash # one-time OWS install
skills/simmer-wallet-setup/SKILL.md, line 46
curl -fsSL https://docs.openwallet.sh/install.sh | bash # one-time OWS install
package.json, line 10
@solana/web3.js
Network
Concern
can reach a host that is not written as a fixed address. can reach registry.npmjs.org. The description does not name that host.
NETWORK_NO_FIXED_HOST NETWORK_UNNAMED_HOST
mcp/bundled-skills/simmer/SKILL.md, line 45
curl -X POST https://api.simmer.markets/api/sdk/agents/register \
mcp/bundled-skills/simmer-mcp-setup/SKILL.md, line 62
curl -X POST https://api.simmer.markets/api/sdk/agents/register \
mcp/src/api.ts, line 117
const resp = await fetch(url, { ...init, signal: ctrl.signal });
Show more
mcp/src/api.ts, line 205
const resp = await fetch(url, { headers: this.headers() });
mcp/src/api.ts, line 233
const resp = await fetch(`${this.apiUrl}/api/sdk/autoresearch/experiments`, {
mcp/src/api.ts, line 247
const resp = await fetch(
mcp/src/api.ts, line 448
const resp = await fetch(`${this.apiUrl}/api/sdk/autoresearch/backtest`, {
mcp/src/mcp-server.ts, line 163
const resp = await fetch("https://registry.npmjs.org/simmer-mcp/latest", {
mcp/src/public-api.ts, line 53
const resp = await fetch(url, {
mcp/src/public-api.ts, line 141
const resp = await fetch(`${apiUrl}/api/sdk/agents/register`, {
skills/polymarket-copytrading/SKILL.md, line 184
curl -X PATCH "https://api.simmer.markets/api/sdk/reactor/config" \
skills/polymarket-soccer-shock-ladder/SKILL.md, line 85
curl -X PATCH https://api.simmer.markets/api/sdk/shock-ladder/config \
skills/simmer/SKILL.md, line 45
curl -X POST https://api.simmer.markets/api/sdk/agents/register \
skills/simmer-mcp-setup/SKILL.md, line 62
curl -X POST https://api.simmer.markets/api/sdk/agents/register \
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV
examples/humanplane_integration.py, line 181
parser.add_argument("--api-key", default=os.getenv("SIMMER_API_KEY"))
examples/regime_gate_skill.py, line 123
api_key = os.environ.get("SIMMER_API_KEY")
skills/polymarket-mil-aircraft-tracker/SKILL.md, line 62
cred = Path.home() / ".config" / "preference" / "credentials.json"
Show more
mcp/bundled-skills/preflight/preflight.py, line 65
api_key = os.environ.get("SIMMER_API_KEY")
mcp/src/mcp-server.ts, line 125
const apiKey = process.env.SIMMER_API_KEY || "";
scripts/check-skill-governance.py, line 460
token = os.environ.get("SIMMER_WEBSITE_SYNC_GITHUB_TOKEN") or os.environ.get(
scripts/check-skill-governance.py, line 625
token = os.environ.get("GITHUB_TOKEN")
simmer_sdk/test_skill.py, line 271
api_key = os.environ.get("SIMMER_API_KEY")
simmer_sdk/test_skill.py, line 272
test_api_key = os.environ.get("SIMMER_TEST_API_KEY")
skills/nansen-copytrader-overlay/nansen_adapter.py, line 138
Reads NANSEN_API_KEY from the environment; falls back to a local .env
skills/nansen-copytrader-overlay/nansen_adapter.py, line 145
env_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), ".env")
skills/nansen-copytrader-overlay/nansen_adapter.py, line 280
"NANSEN_API_KEY is not set - set the env var (or add it to .env). "
skills/polymarket-mil-aircraft-tracker/pref_client.py, line 19
PREF_CREDENTIALS_PATH = Path.home() / ".config" / "preference" / "credentials.json"
skills/polymarket-mil-aircraft-tracker/pref_client.py, line 52
print(" [pref] PREF_API_KEY not set and no ~/.config/preference/credentials.json key found - skipping pref call")
.archived-2026-05-mcp-pre-unification/src/index.ts, line 201
requiredEnv: clawhub.requires?.env ?? [],
.gitignore, line 26
# Virtual environments
Agent instructions
Serious
instructions tell the agent to hide a step.
AGENT_HIDDEN_STEP
mcp/bundled-skills/simmer-mcp-setup/SKILL.md, line 638
- **Don't tell the user "it should work now" without verifying.** Run Step 6 - confirm a real tool call returns real data.
skills/simmer-mcp-setup/SKILL.md, line 638
- **Don't tell the user "it should work now" without verifying.** Run Step 6 - confirm a real tool call returns real data.
Obfuscation
Note
a file was over the read cap and was not fully read. the file cap was reached before every file was read.
OBFUSCATION_FILE_OVER_READ_CAP OBFUSCATION_FILE_CAP_REACHED
simmer_sdk/client.py, line 1
"""
tests/test_plan_package_publish.py, line 1
import importlib.util
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit ae3f303b6c16. can delete files. install fetches a script from the network. can reach a host that is not written as a fixed address. can reach registry.npmjs.org. The description does not name that host. reads a credential or environment file. instructions tell the agent to hide a step. a file was over the read cap and was not fully read. the file cap was reached before every file was read.
Date and source
Date checked:
github.com
Commit graded: ae3f303b6c1603d5cff1e07dcdadb7fa22506e27
This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.