Semahash
Run content-addressed semantic handshakes with fail-closed behavior so agents align on meaning before trusting multi-step tool output.
Overview
semahash is an MCP server for the Ship phase that enforces fail-closed semantic handshakes across 452 content-addressed cognitive patterns.
What is this MCP server?
- Content-addressed semantics with fail-closed handshakes when patterns do not match
- Catalog of 452 cognitive patterns for structured agent alignment checks
- PyPI semahash package v0.2.3 runnable via uvx with stdio MCP entry sema mcp
- Website documentation at semahash.org for protocol semantics
- Targets builders who need deterministic semantic agreement beyond plain JSON schema validation
- 452 cognitive patterns in the protocol description
- Server version 0.2.3
- PyPI package: semahash with uvx runtime hint
Community signal: 4 GitHub stars.
What problem does it solve?
Agents and tools can look aligned in prose while meaning diverges, and nothing stops the pipeline until a wrong deploy or bad data change lands.
Who is it for?
Advanced solo builders shipping multi-agent or high-stakes tool chains who want protocol-level semantic gates beyond prompt politeness.
Skip if: Beginners who only need simple API wrappers, note search, or lightweight brainstorming without alignment infrastructure.
What do I get? / Deliverables
After you wire semahash MCP, critical steps can require matching semantic hashes so mismatches halt instead of proceeding on fuzzy agreement.
- Registered semahash stdio MCP server
- Inspectable semantic handshake steps using the published pattern catalog
- Fail-closed gates you can place before high-risk agent tool invocations
Recommended MCP Servers
Journey fit
How it compares
Semantic handshake MCP protocol, not a CRUD integration or generic code-review skill.
Common Questions / FAQ
Who is semahash for?
It is for agent authors and indie teams shipping automated workflows where misunderstood intent must block execution rather than auto-correct silently.
When should I use semahash?
Use it in Ship and security-hardening passes when coordinating agents, planners, and executors that must agree on structured meaning before irreversible tools run.
How do I add semahash to my agent?
Install uvx, run the published semahash v0.2.3 MCP entry (uvx --from semahash sema mcp per package metadata), and register that stdio command in your MCP client.