diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..54b4853
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,81 @@
+# Didactyl — Agent Instructions
+
+## Build
+
+**Always use `./build_static.sh` to build the binary.** Never run `make` directly — the default `all` target prints a warning and exits with an error. `make` is kept only for auxiliary targets (`make clean`, `make deps`, `make test_pool`).
+
+```bash
+./build_static.sh              # Release build (static MUSL via Docker)
+./build_static.sh --debug      # Debug build
+./build_static.sh --platform=linux/arm64  # Cross-compile
+```
+
+## Project Overview
+
+Didactyl is a Nostr agent written in C (C99). It runs as a long-lived daemon that listens for DMs from its admin, processes them via an LLM, and can execute tools (post notes, query relays, manage skills, etc.).
+
+## Key Files
+
+| File | Purpose |
+|------|---------|
+| `src/main.c` | Entry point, CLI arg parsing, signer construction |
+| `src/setup_wizard.c` | Interactive setup wizard (8 steps) |
+| `src/config.c` / `src/config.h` | Config loading from genesis.jsonc |
+| `src/nostr_handler.c` / `src/nostr_handler.h` | Nostr relay pool, event publish/subscribe |
+| `src/llm.c` / `src/llm.h` | LLM HTTP client (OpenAI-compatible API) |
+| `src/agent.c` | Agent loop: DM → LLM → tool dispatch → response |
+| `src/tools/` | Tool implementations (one file per tool) |
+| `src/tools/tools_schema.c` | Tool schemas (JSON Schema for each tool) |
+| `src/tools/tools_dispatch.c` | Tool dispatch routing |
+| `src/default_events.h` | Default relays, skill templates |
+| `src/signer_health.c` / `src/signer_health.h` | Signer health monitoring |
+| `nostr_core_lib/` | Vendored nostr_core_lib (v0.6.15) |
+| `genesis.jsonc.example` | Example genesis config |
+| `build_static.sh` | Static build script (Docker + Alpine + musl) |
+| `Dockerfile.alpine-musl` | Dockerfile for static builds |
+| `increment_and_push.sh` | Version bump + git tag + push |
+
+## Coding Conventions
+
+- **Language**: C99 (`-std=c99`)
+- **Style**: 4-space indentation, K&R braces
+- **Naming**: `snake_case` for functions and variables, `UPPER_CASE` for macros
+- **Headers**: Include guard via `#ifndef` / `#define` / `#endif`
+- **Error handling**: Return negative error codes, use `NOSTR_SUCCESS` (0) from `nostr_core_lib/nostr_core/nostr_common.h`
+- **Logging**: Use `DEBUG_INFO()`, `DEBUG_WARN()`, `DEBUG_ERROR()` macros from `src/debug.h`
+- **Memory**: Manual malloc/free; no GC
+- **JSON**: Use cJSON library (`nostr_core_lib/cjson/`)
+
+## Key Architecture Decisions
+
+- **Signer abstraction**: All crypto operations go through `nostr_signer_t` (local or remote via n_signer). The signer is constructed in `main.c` and passed through the tool context.
+- **Role paths**: Uses BIP-44 derivation paths (`role_path`) instead of the old `nostr_index` selectors. See `docs/SIGNER.md`.
+- **Wizard**: The setup wizard (`src/setup_wizard.c`) is a plain-text interactive TUI (no ncurses). It uses `fprintf(stderr, ...)` for output and `fgets()` for input.
+- **Config persistence**: Config is published as NIP-44 encrypted kind 30078 events on Nostr, keyed by `d_tag` (e.g. `"user-settings"`).
+- **Skills**: Agent skills are kind 31124 events with `d_tag` identifiers. They contain markdown with template variables like `{{my_kind0_profile}}`, `{{my_npub}}`, `{{nostr_dm_history(...)}}`.
+
+## Testing
+
+```bash
+cd tests && python3 run_tests.py    # Run test suite
+```
+
+Tests are in `tests/suites/` using a Python harness. Each test spawns a didactyl instance with a test genesis config and checks behavior via the HTTP admin API.
+
+## Versioning
+
+Versions follow `vMAJOR.MINOR.PATCH` format. Use `./increment_and_push.sh "description"` to bump the patch version, commit, tag, and push.
+
+## Nostr Core Library
+
+The vendored `nostr_core_lib/` is a static library (`libnostr_core_x64.a`). To rebuild it:
+
+```bash
+cd nostr_core_lib && ./build.sh --nips=001,004,005,006,011,013,017,019,021,042,044,046,059,060,061
+```
+
+## Important Notes
+
+- The wizard runs before `main()` sets up the CA bundle, so `fetch_models_for_llm_config()` in the wizard explicitly calls `nostr_http_set_ca_bundle()`.
+- ppq.ai does not expose a balance/credits endpoint — the wizard skips balance checks for `"ppq"` provider.
+- The `relay_remove_index()` function in `setup_wizard.c` is unused (relays use toggle-based enable/disable, not removal).
diff --git a/README.md b/README.md
index 0a78f97..ab81b85 100644
--- a/README.md
+++ b/README.md
@@ -54,11 +54,11 @@ Skills compose by adoption-list order (`10123`) and trigger tags carry runtime e
 
 Didactyl will support local inference, which is very privacy preserving. Remote inference does however have it's advantages, and in those cases Didactyl supports using Bitcoin Lightning and eCash inference providers.
 
-## Current Status — v0.2.69
+## Current Status — v0.2.70
 
 **Active build — this project is barely working. Experiment at your own risk.**
 
-> Last release update: v0.2.69 — Makefile: replace default 'all' target with warning to use build_static.sh instead
+> Last release update: v0.2.70 — Add AGENTS.md with build instructions, project overview, coding conventions, and key architecture decisions
 
 - Connects to configured relays with auto-reconnect and relay state transition logging
 - Publishes configured startup events per relay as each relay becomes connected
diff --git a/src/main.h b/src/main.h
index 4778908..738d9e2 100644
--- a/src/main.h
+++ b/src/main.h
@@ -12,8 +12,8 @@
 // Using DIDACTYL_ prefix to avoid conflicts with nostr_core_lib VERSION macros
 #define DIDACTYL_VERSION_MAJOR 0
 #define DIDACTYL_VERSION_MINOR 2
-#define DIDACTYL_VERSION_PATCH 69
-#define DIDACTYL_VERSION "v0.2.69"
+#define DIDACTYL_VERSION_PATCH 70
+#define DIDACTYL_VERSION "v0.2.70"
 
 // Agent metadata
 #define DIDACTYL_NAME "Didactyl"