Ouroboros
ouroboros-ai · by Q00
Pins an acceptance spec; the verify command and expected output never enter the success contract.
No known CVEs
MIT license
Actively maintained
Last commit 1d ago
Works with most clients
Transport: stdio, sse, http
11 tools · ~508 tok
Grade B · 0.3% of 200K ctx
MCPpedia last refreshed this data
Ouroboros is an MCP server that pins an acceptance spec; the verify command and expected output never enter the success contract. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 85/100 on MCPpedia's security, maintenance and efficiency rubric.
Step 1
Install in your client
Config is the same across clients - only the file and path differ.
CD
Supported in Claude Desktopstdio, sse, http · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"ouroboros": {
"args": [
"ouroboros-ai"
],
"command": "uvx"
}
}
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What Ouroboros does
Pins an acceptance spec; the verify command and expected output never enter the success contract.
Test This Server
This server supports HTTP transport. Be the first to test it - help the community know if it works.
Scored, not listed
Why this score
Five weighted categories - click any category to see the underlying evidence.
Score breakdown
85/100across 5 weighted dimensions
0255075100
29
15
16
15
10
−15
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.dev2 fixed
CVE-2026-47211high · fixed
ouroboros-ai Vulnerable to Remote Code Execution via Untrusted Project-Directory .env
### Impact A Remote Code Execution (RCE) vulnerability was discovered in Ouroboros. If a user clones a malicious repository and runs Ouroboros commands within that directory, it can lead to arbitrary code execution and potential system takeover. The vulnerability (CWE-426: Untrusted Search Path & CWE-15: External Control of System Setting) stems from Ouroboros loading the `.env` file from the current working directory. Prior to the patch, execution-affecting environment variables such as `OUROB
CVE-2026-66065high · fixed
ouroboros-ai: Incomplete fix of CVE-2026-47211: untrusted project .env can still reach RCE via omitted execution-routing keys
### Impact The CVE-2026-47211 fix (0.39.0) added `_UNTRUSTED_ENV_DENYLIST` to stop an untrusted project-directory `.env` from redirecting execution. The denylist was incomplete — several execution-routing keys of the same RCE class were omitted, so a malicious cloned repo can still reach arbitrary command execution by shipping a `.env` (auto-loaded at import, no review step): - **Backend config-home roots** `CODEX_HOME`, `OPENCODE_CONFIG`, `OPENCODE_CONFIG_DIR`, `XDG_CONFIG_HOME`: a spawned ven
Inventory
Tools (11)
Click any tool to inspect its schema.
~508 tokens total
Community
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Frequently Asked Questions
- Is Ouroboros safe to use?
- Ouroboros has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.
- How do I install Ouroboros?
- Ouroboros supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What can Ouroboros do?
- Ouroboros provides 11 tools: stateless, Drift, Brownfield, Evolution, Stagnation and 6 more. See the full tools list on the server page for descriptions and parameters.
- What AI clients work with Ouroboros?
- Ouroboros is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
- Is Ouroboros actively maintained?
- Ouroboros is actively maintained - last commit was 1 day ago. It has 6,115 GitHub stars.
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