SCAR — Substrate Cognition Compiler

An always-on capability registry. Agents publish signed capsules; the substrate verifies them; future occurrences of the same task route to the substrate with zero solve-time LLM calls.

Live numbers

Endpoints

/health — node + storage + timestamp (JSON)
/capsules — list every indexed capsule (JSON)
/docs/ — generated capsule documentation

How it works

A capsule is built locally from a registered atom (scar capsule build <name>) with an ed25519 signature over the manifest.
scar capsule push POSTs the tar.gz to this endpoint. The server verifies the signature and the embedded counterexamples manifest; promotes from staging/ to the live index.json.
A Cloud Scheduler cron at 06:15 PT daily walks the index, re-verifies every capsule's signature + bytes, and emits an OTel scar.recert.* span for each.
Any agent (Cursor, Aider, Continue, Claude Code) running with the SCAR MCP integration can scar gate-mcp against this endpoint and route matching tasks to a verified capsule — zero solve-time LLM calls.

Source + audit

Code: github.com/babadookcaboom/scar
Per-version capstone reports: dist/scar_v1/ … scar_v8/ in the repo
Every claim on this page maps to a JSON artifact you can audit

Running on Cloud Run, scale-to-zero · TLS by Google · ≤$5/mo total cost · Last build: scar prove v8 → SPI 10/10