MCP, MCP server
Xrpl Referee
40+-tool MCP server and REST API for trust-minimized agent-to-agent payments on the XRP Ledger.
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
INSTALL_UNPINNED NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP
Why this grade
- INSTALL_UNPINNED Low
Dependencies use a range or git URL with no lockfile.
requirements.txt, line 1
fastapi - NETWORK_NO_FIXED_HOST Low
Makes a network call whose host is not written as a fixed address.
scripts/check_tool_drift.sh, line 5
SID=$(curl -s -D - -o /dev/null "${H[@]}" "$MCP" \ - SECRETS_PATH_DOTENV Low
Mentions a .env file.
mcp_server.py, line 100
" store seed in .env, pass only your public address to AgentTrust. Seed never leaves your environment.\n" - SECRETS_ENV_READ Note
Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.
mcp_server.py, line 2899
"const privy = new PrivyWallet({ appId: process.env.PRIVY_APP_ID, appSecret: process.env.PRIVY_APP_SECRET });\n" - OBFUSCATION_FILE_OVER_READ_CAP Note
A file was over the read cap and was not fully read.
favicon.svg, line 1
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="1672" height="1672" viewBox="0 0 1672 1672"><image width="1672" height="1672
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Pass
No shell or command execution found, and no extra permission was declared.
Install and update
Concern
dependencies are not pinned.
INSTALL_UNPINNED
requirements.txt, line 1
fastapi
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
scripts/check_tool_drift.sh, line 5
SID=$(curl -s -D - -o /dev/null "${H[@]}" "$MCP" \
scripts/check_tool_drift.sh, line 8
curl -s -o /dev/null "${H[@]}" ${SID:+-H "Mcp-Session-Id: $SID"} "$MCP" -d '{"jsonrpc":"2.0","method":"notifications/initialized"}'
scripts/check_tool_drift.sh, line 9
curl -s "${H[@]}" ${SID:+-H "Mcp-Session-Id: $SID"} "$MCP" -d '{"jsonrpc":"2.0","id":2,"method":"tools/list"}' \
Show more
scripts/check_tool_drift.sh, line 11
curl -s "$BASE/.well-known/mcp/server-card.json" | jq -r '.tools[].name' | sort > /tmp/card.txt
scripts/check_tool_drift.sh, line 12
curl -s "$BASE/.well-known/marketplace.json" | jq -r '.mcp_tools[]' | sort > /tmp/mkt.txt
playground.html, line 444
const res = await fetch(`${REFEREE_URL}/audit`, {
Secrets
Concern
reads a credential or environment file.
SECRETS_ENV_READ SECRETS_PATH_DOTENV
mcp_server.py, line 100
" store seed in .env, pass only your public address to AgentTrust. Seed never leaves your environment.\n"
mcp_server.py, line 106
" Store the returned seed securely in your .env. Free tier credit is applied automatically.\n"
mcp_server.py, line 2899
"const privy = new PrivyWallet({ appId: process.env.PRIVY_APP_ID, appSecret: process.env.PRIVY_APP_SECRET });\n"
Show more
mcp_server.py, line 2719
(Wallet.generate() + seed in .env) where the seed never leaves your environment.
mcp_server.py, line 2861
" - it registers your wallet and grants 3 free escrows. Store the seed securely in your .env."
mcp_server.py, line 2869
"print('Seed: ', w.seed) # store this in .env - never share\n"
mcp_server.py, line 2880
"warning": "Never commit .env to version control. Add it to .gitignore.",
mcp_server.py, line 2928
"Seed stored in .env or a secrets manager (Vault, AWS Secrets Manager, etc.)",
mcp_server.py, line 3034
api_key = coinbase_api_key or os.environ.get("COINBASE_API_KEY", "")
mcp_server.py, line 3035
api_secret = coinbase_api_secret or os.environ.get("COINBASE_API_SECRET", "")
mcp_server.py, line 3170
"using xrpl-py's `Wallet.create()`, stores the seed in your `.env` file. "
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
favicon.svg, line 1
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink" width="1672" height="1672" viewBox="0 0 1672 1672"><image width="1672" height="1672
referee.py, line 1
import os
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 2e0920b1b92f. dependencies are not pinned. can reach a host that is not written as a fixed address. reads a credential or environment file. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: 2e0920b1b92fb262211a02811414c9c4f1beb2b5
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