Question 1

What problem does JevGuard solve?

Accepted Answer

It wraps TypeSafe's System One with a strictly deterministic local layer: canonical JSON sorting, SHA-256 fingerprinting with volatile key masking, SQLite storage, rule-based calibration checks and neutral escape injection, using only the Python standard library.

Question 2

How does the cache avoid misses on dynamic payloads?

Accepted Answer

It masks volatile keys before fingerprinting, so timestamps and request IDs do not change the canonical JSON. Repeated identical state checks hit the local SQLite cache; a cached hit served in 0.099 ms with 0 tokens billed in the README's benchmark.

Question 3

What is closed-world escape injection?

Accepted Answer

When categorical choice criteria lack a neutral fallback, the model distributes all probability across defined options and can force an off-topic input into one. JevGuard detects that and injects UNRESOLVED_OR_OTHER so such inputs route to an escape option.

Question 4

What does the AMBIGUOUS_STATE alert mean?

Accepted Answer

It is the calibration guardrail: when probability distributions flatten or the top option barely beats the runner-up, JevGuard flags bimodal ties and low certainty instead of letting a decision pass on an unverified top probability.

Question 5

How much overhead and latency does it add?

Accepted Answer

The README measures 0.024 ms local runtime overhead and 735.88 ms average latency with state pruning versus 784.53 ms direct, across 50 live verification requests; the sub-millisecond cache hit is where the savings come from.

Question 6

Does JevGuard work without an API key or the internet?

Accepted Answer

No. It is a local layer around the hosted System One API, so uncached decisions still require network access and a TypeSafe key; the cache and guardrails only reduce repeated calls and calibrate results.

Question 7

Who built it and where is the MCP server?

Accepted Answer

seb4ez publishes it under MIT on PyPI as jevguard-core; it had 0 stars and 1 fork at review time. An official zero-dependency MCP server for Cursor, Claude Desktop, Cline and Google Antigravity lives at seb4ez/jevguard-mcp.

JevGuard (seb4ez)

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