Move Nix flake to repo root

.github/workflows/openai-serve.yml

@@ -5,13 +5,17 @@ on:
     branches:
       - main
     paths:
+      - flake.nix
+      - flake.lock
       - apps/openai-serve/**
       - go-lcpd/proto/**
       - proto/**
       - proto-go/**
       - .github/workflows/openai-serve.yml
   pull_request:
     paths:
+      - flake.nix
+      - flake.lock
       - apps/openai-serve/**
       - go-lcpd/proto/**
       - proto/**
@@ -38,5 +42,4 @@ jobs:
           use-flakehub: false
 
       - name: Lint and test
-        run: nix develop ./go-lcpd -c make -C apps/openai-serve lint test
-
+        run: nix develop . -c make -C apps/openai-serve lint test

.github/workflows/proto-go.yml

@@ -5,12 +5,16 @@ on:
     branches:
       - main
     paths:
+      - flake.nix
+      - flake.lock
       - go-lcpd/proto/**
       - proto/**
       - proto-go/**
       - .github/workflows/proto-go.yml
   pull_request:
     paths:
+      - flake.nix
+      - flake.lock
       - go-lcpd/proto/**
       - proto/**
       - proto-go/**
@@ -36,10 +40,9 @@ jobs:
           use-flakehub: false
 
       - name: Lint protos
-        run: nix develop ./go-lcpd -c sh -lc 'cd go-lcpd && buf lint'
+        run: nix develop . -c sh -lc 'cd go-lcpd && buf lint'
 
       - name: Verify proto-go generated code is up to date
         run: |
-          nix develop ./go-lcpd -c sh -lc 'cd go-lcpd && buf generate --template ../proto-go/buf.gen.yaml'
+          nix develop . -c sh -lc 'cd go-lcpd && buf generate --template ../proto-go/buf.gen.yaml'
           git diff --exit-code -- proto-go
-

.github/workflows/test.yml

@@ -5,12 +5,16 @@ on:
     branches:
       - main
     paths:
+      - flake.nix
+      - flake.lock
       - go-lcpd/**
       - proto/**
       - proto-go/**
       - .github/workflows/test.yml
   pull_request:
     paths:
+      - flake.nix
+      - flake.lock
       - go-lcpd/**
       - proto/**
       - proto-go/**
@@ -39,4 +43,4 @@ jobs:
           use-flakehub: false
 
       - name: Lint and test
-        run: nix develop ./go-lcpd -c make -C go-lcpd lint test
+        run: nix develop . -c make -C go-lcpd lint test

CONTRIBUTING.md

@@ -57,13 +57,13 @@ If you're unsure what to pick up, open an issue with what you want to do and we'
 
 ## Development setup
 
-This repo uses Nix flakes to keep the dev environment consistent.
+This repo uses Nix flakes to keep the dev environment consistent (see repo root `flake.nix`).
 
 Typical workflow:
 
 ```sh
-cd go-lcpd
 nix develop
+cd go-lcpd
 make test
 ```
 

go-lcpd/flake.nix → flake.nix

@@ -1,5 +1,5 @@
 {
-  description = "go-lcpd dev environment (pinned toolchain + regtest devnet)";
+  description = "lightning-compute-protocol dev environment (pinned toolchain + regtest devnet)";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -57,11 +57,12 @@
             export GOFLAGS="-buildvcs=false"
 
             echo "devshell ready"
-            echo "  test:    make test"
-            echo "  regtest: make test-regtest"
-            echo "  devnet:  ./scripts/devnet up"
+            echo "  test:    make -C go-lcpd test"
+            echo "  regtest: make -C go-lcpd test-regtest"
+            echo "  devnet:  go-lcpd/scripts/devnet up"
           '';
         };
       }
     );
 }
+

go-lcpd/.envrc.sample

@@ -2,10 +2,10 @@
 
 # direnv config for go-lcpd.
 #
-# - use the go-lcpd flake via `nix develop`
+# - use the repo root flake via `nix develop`
 # - run `direnv allow` once to enable auto-loading
 
-use flake .
+use flake ..
 
 # Optional: enable regtest integration tests (heavy).
 # export LCP_ITEST_REGTEST=1

go-lcpd/Makefile

@@ -1,12 +1,12 @@
 .PHONY: test test-regtest test-regtest-custommsg test-regtest-grpc test-regtest-openai-serve lint tools gen fmt proto-deps devnet-up devnet-down devnet-status devnet-info
 
 # Nix-first workflow:
-# - All targets are meant to run inside the go-lcpd devShell (`nix develop`).
+# - All targets are meant to run inside the repo devShell (`nix develop` at repo root).
 # - If you invoke `make` outside the devShell, this Makefile re-execs itself via
-#   `nix develop -c make ...` so that tool versions are pinned by flake.lock.
+#   `nix develop .. -c make ...` so that tool versions are pinned by flake.lock.
 .DEFAULT_GOAL := test
 
-NIX_DEVELOP ?= nix develop
+NIX_DEVELOP ?= nix develop ..
 GOALS := $(if $(MAKECMDGOALS),$(MAKECMDGOALS),$(.DEFAULT_GOAL))
 
 ifeq ($(strip $(IN_NIX_SHELL)),)

go-lcpd/README.md

@@ -13,7 +13,7 @@ For the LCP wire protocol spec, see `../docs/protocol/` (e.g., `../docs/protocol
 
 Prerequisites:
 - Go 1.24.4+ (or a Go toolchain that supports module toolchain auto-download)
-- Optional: Nix (flakes enabled) + direnv for a pinned toolchain (`flake.nix`)
+- Optional: Nix (flakes enabled) + direnv for a pinned toolchain (repo root `../flake.nix`)
 
 If you use the optional Nix devShell, it includes Go / buf / golangci-lint v2 / and (when needed) bitcoind / lnd / jq.
 
@@ -34,7 +34,7 @@ Notes:
 
 ```sh
 cd go-lcpd
-nix develop
+nix develop ..
 
 make gen
 make test

go-lcpd/provider.devnet.yaml

@@ -0,0 +1,17 @@
+enabled: true
+quote_ttl_seconds: 300
+
+llm:
+  models:
+    gpt-5.2:
+      price:
+        input_msat_per_mtok: 1750000
+        cached_input_msat_per_mtok: 175000
+        output_msat_per_mtok: 14000000
+
+# Optional: load-based surge pricing at quote-time.
+pricing:
+  in_flight_surge:
+    threshold: 2
+    per_job_bps: 500 # +5% per job above threshold
+    max_multiplier_bps: 30000 # 3.0x cap

go-lcpd/scripts/devnet

@@ -52,7 +52,7 @@ Environment variables (optional):
 
 Notes:
   - Requires `bitcoind`, `bitcoin-cli`, `lnd`, and `lncli` on PATH.
-  - If you use the optional Nix devShell, you can run: `nix develop -c ./scripts/devnet up`
+  - If you use the optional Nix devShell, you can run: `nix develop .. -c ./scripts/devnet up`
   - All state is stored under ./.data/devnet/ (gitignored).
 EOF
 }