This release has been yanked by its maintainers, and will be ignored by installers, except when explicitly specified.
Consider using release 0.1.2 instead.
Reason given by maintainers: Crashes on startup with mcp>=2.0; fixed in 0.1.2.
bouncer-mcp
The local stdio MCP proxy half of bouncer.
It sits between your MCP client and your existing tool servers, re-exports every
tool 1:1, and enforces bouncer-core's
contracts on each call.
uv tool install bouncer-mcp
bouncer init
The enforcement engine — provenance and taint rules, per-argument constraints,
call budgets — is bouncer-core, which depends only on pyyaml and speaks no
MCP at all. Install that one directly if you are enforcing contracts inside your
own harness rather than proxying an MCP server.
There is no LLM in the enforcement path. Every decision is plain Python over a recorded schema, a policy, and a taint log.
Full documentation, the threat model, and the benchmark results are in the repository README.
1 maintainer
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