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Show HN: CoreTex – An Open-Source, Unix-like, biomimetic, flat-file AI Harness

Daniel Casper released CoreTex, an open-source AI agent harness that combines Unix-like flat-file architecture with biomimetic design based on human neuroanatomy. The tool operates as an always-on daemon with a five-tier memory stack, zero-token code execution through "cerebellar muscle memory," and sandboxed code execution in a Deno-hosted V8 jail. CoreTex aims to provide safe, cost-effective AI integration by processing text files locally before spending API tokens and supporting composability through standard Unix pipes and redirects.

read6 min publishedMay 27, 2026

Note to Systems Engineers:I took the biomimicry domain-driven design quite far (e.g., the master daemon is theMedulla

, short-term memory is theHippocampus

). It is eccentric, but underneath is (arguably) a highly optimized, concurrent, lock-safe, and execution engine that runs purely on flat files.

CoreTex is a UNIX-inspired, biomimetic agent harness and knowledge engine intended to help you use AI safely, cost-effectively, and in a way that helps you integrate the whole of your life.

Borrowing deeply from human neuroanatomy, CoreTex lets you organize and synthesize information (supercharging Obsidian Vaults), write and execute code in a hardened environment, and utilize peripherals (camera, mic, etc.) alongside webhooks and headless web browsing to observe and react to the outside world.

CoreTex is also intended to be an always-on daemon, understanding your goals and helping you achieve them over time.

UNIX Philosophy: Everything is a file like it's the 1970s! State, IPC, data, and queue files are guarded by OS-level locks. Databases are banished to the shadow realm (excluding the SQLite FTS5 DB which reads the flat files for performance). Composability with standard operators is supported - pipe, redirect, etc.Cerebellar Muscle Memory (Zero-Token Execution): When CoreTex successfully completes writing code, e.g. setting up a project, the Cerebellum can make it an engram to rerun at 0-cost.Highly experimentaland will need improvements.Roadmap itemto enable engram sharing.Token economicsis a major concern for CoreTex.5-Tier BiomimeticMemory Stack:** Working Memory**- token aware compression inserted between active head and tail for infinite task continuity without amnesia.** Short-Term Recall (Vectorless Search):Replace the DB with a local SQLite FTS5 index and BM25 ranking. Snippet truncation finds code matches without bloating the context window.Relation Knowledge- maps dependencies and markdown connections to a serialized graph, protected by the Anterior Cingulate Cortex circuit breaker if a loop is detected.Episodic Memory- keeps a ledger of its objectives and actions in a thread safe WAL JSONL stream. Long Term Memory**- when CoreTex sleeps, it rotates logs and extracts key memories from them which are used to align the system to you

Safe-by-Default: The default "Cognitive Mode" is strictly for reading/writing/working on an Obsidian vault or files. Code execution requires explicit user opt-in and is isolated inside an offline Deno-hosted V8 + WebAssembly jail with strict resource limits.

CoreTex operates on text files and local indexing, meaning you can parse your entire codebase before spending a single API token.

1. Absorb data (0 Token Cost - Local SQLite Indexing)

./ctx absorb ./my_old_project -d Studio/MyProject -t "legacy, python"
./ctx absorb ./journal -d Personal/Journal -t "journal, writing"

2. Execute a sandboxed agentic task

./ctx task "Audit ./my_project for concurrency race conditions and output to audit.md"

3. Native Unix Piping

cat error.log | grep "Timeout" | ./ctx task "Explain this failure cascade"

4. Daydreaming

./ctx daydream

CoreTex features a unified setup script to automatically handle prerequisites, virtual environments, and container architectures.

chmod +x setup.sh
./setup.sh --check      # Optional: run preflight diagnostics
./setup.sh              # Interactive setup (use --local or --docker to bypass prompts)
powershell -ExecutionPolicy Bypass -File .\setup.ps1 -Check
powershell -ExecutionPolicy Bypass -File .\setup.ps1  # Use -Local or -Docker to bypass prompts

Note: CoreTex natively supports routing via Enterprise API Gateways (Cloudflare, Portkey, Helicone) for observability. Select [Gateway] during setup.

The setup utility offers two distinct runtime architectures:

Local (Recommended): Uses Astral's hyper-fastuv

and thedeno

secure runtime.Isolated Container: Uses Docker Compose with strict UID/GID mapping to prevent root-owned file pollution.

Both paths launch the Synaptic Genesis wizard to configure your nervous system:

Operating Profile:* Cognitive Mode*(safe advisory) orAgentic Mode(sandboxed execution).Sensory Innervation: Toggle vision scrapers (Playwright) or local hardware mic/speakers.Synapses & Workspace: Link your LLMs (OpenAI, Anthropic, local Ollama) and bind CoreTex to a target directory.

Once complete, restart your terminal and command the swarm:

./ctx status
./ctx task "Summarize this repository in five bullets"
./ctx status # health check
./ctx live # engage main daemon
./ctx task "do a thing" # executes along route + domain
./ctx absorb examples/show-hn-mini-project --domain Professional --tags show-hn,demo
./ctx daydream

Declarative configs via YAML (these will be cleaned up). After setup, you can freely customize your agents, tools, and models without touching code:

: Change default cloud models (e.g. swapSystem/config/system.yaml

gpt-4o-mini

forclaude-3-5-sonnet-latest

), set maximum daily token limits, or tweak system behavioral conditions likedopamine

(increases temperature) andcortisol

(ignores token budgets).: Definitions of system prompts, execution routes, agents (likeSystem/config/agents.yaml

fast_responder

orqa_auditor

), and tool calling lives here.: The physical capability registry. Expose new bash commands, define webhooks, or add JSON schemas for entirely new sensory organs.System/config/tools.yaml

(Note: The setup script will automatically map your preferred default AI model to system.yaml during installation!)

🔐 Security & Sandboxing (Safe-by-Default) #

Running LLM-generated code locally is inherently dangerous. CoreTex ships in Cognitive Mode by default—it can write code and plan tasks, but it cannot execute scripts. If you explicitly opt-in (CORETEX_ENABLE_CODE_EXECUTION=true

in your .env

), CoreTex activates a strict containment matrix:

The Deno + WASM Jail: CoreTex doesnotrun generated code in your native Python or Bash environment. It forces the LLM to write code executed inside an ephemeral, unprivilegedDeno + WebAssembly instance.- Firecracker support is on the horizon

The Volume Mask: The agent is physically incapable of seeing files outside the specific directory bound during setup.Cognitive Fallback: If Deno is missing or unreachable, the system safely degrades back toCognitive Mode, immediately stripping the agent's subprocess execution tools entirely.

** Obsidian** is a first class citizen in CoreTex. CoreTex will automatically detect the

.obsidian

configuration folder and atomically configure native hotkeys (Ctrl+Alt+S

). Note: To map active shell commands directly to these hotkey bindings from within the graphic editor interface, please ensure the standard

obsidian-shellcommands

community plugin is active in your vault. You may struggle with these.Commands include:

./ctx setup

: Boot the interactive onboarding wizard to configure API keys, LLM routing, and workspace bindings../ctx task "<prompt>"

: Dispatches a multi-agent swarm to accomplish a goal../ctx daydream

: Triggers the Default Mode Network (DMN) to autonomously organize files, compress old memories, and refactor code in the background../ctx status

: Opens the real-time Cortical Telemetry dashboard to monitor active agent loops and memory usage.

Trigger CoreTex external receptors directly from the execution plane:

./ctx sense screenshot "https://google.com" "google.png"

-Takes a headless web screenshot../ctx sense perceive "google.png" "Describe layout"

-Uses the Occipital Lobe to analyze visual stimuli../ctx sense scrape "https://github.com"

-Transduces a web page into raw markdown text format../ctx sense listen --duration 10

-Activates physical microphone hardware receptors../ctx sense speak output.wav

-Dispatches sound arrays down physical speaker hardware channels.

If you are done with CoreTex, leave no trace behind:

./ctx destroy

This securely purges all local ledgers, token tracking logs, environment API keys, and execution queues. It respects your machine.

CoreTex values Shift-Left engineering. We enforce focused regression coverage around security, file locking, and execution bypass logic. To verify your PR against our automated gates:

uv run pytest System/tests Sense/tests -v
uv run ruff check .

If you believe in a local, flat-file AI harness and want to see where this biological experiment goes, please consider giving the repo a star! It is the best way to help other developers discover the project which will help me keep it going.

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