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AGENTS.md
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# AGENTS.md
Context for AI coding agents (opencode) working in this repository.
## What this is
Declarative [Nix](https://nixos.org) + [Home Manager](https://github.com/nix-community/home-manager)
configuration for `debian-13-opencode`, a **Debian 13 (trixie) non-NixOS VM**
running **standalone Nix**. This repo is the single source of truth for the
user's shell, tools, and dotfiles. System-wide Nix settings are applied
separately by `install.sh`.
There is no NixOS module system here — Home Manager is used in standalone mode.
## Environment
- OS: Debian GNU/Linux 13 (trixie), `x86_64-linux`, kernel 6.12.
- Nix 2.26.3 with `nix-command` + `flakes` (declared in `config/nix.conf`).
- Home Manager `26.11-pre`; `home.stateVersion = "26.05"`.
- User `user`, home directory `/home/user`.
- Login shell is bash, which immediately `exec fish` for interactive sessions.
- Managed packages: `opencode`, `ncdu`, `nano`, `tinfoil-proxy`.
- Managed programs: bash, fish, tmux, starship, home-manager.
- **No linter, formatter, CI, or git hooks are configured.** Do not assume
`nixfmt`, `alejandra`, `statix`, `deadnix`, `shellcheck`, or `treefmt` exist.
- Working tree is expected to report `warning: Git tree '...' is dirty`; this
is normal and does not affect evaluation.
## Layout
| Path | Purpose |
| --------------------------- | ------------------------------------------------------------------ |
| `flake.nix` | Root flake: overlay for `tinfoil-proxy`, `homeConfigurations.user`. |
| `home/default.nix` | Home Manager config: packages, file links, programs, user service. |
| `config/nix.conf` | Source of truth for Nix settings (`sandbox`, flakes). |
| `config/starship.toml` | Starship "nerd-font-symbols" preset. |
| `config/opencode.jsonc` | Global opencode config, incl. the `tinfoil` provider. |
| `tinfoil-proxy/flake.nix` | Self-contained flake exposing the `tinfoil-proxy` package. |
| `tinfoil-proxy/package.nix` | Derivation: version, hashes, `buildGoModule` with `go_1_27`. |
| `install.sh` | Installs `config/nix.conf` to `/etc/nix/nix.conf` (sudo, backs up). |
| `flake.lock` | Pinned inputs; **intentionally tracked** for reproducibility. |
## Commands
```sh
home-manager switch --flake .#user # apply the user config (the main loop)
sudo ./install.sh # install /etc/nix/nix.conf (idempotent)
nix build ./tinfoil-proxy # build only the Go proxy package
nix flake show # list flake outputs
nix flake update # bump pinned inputs
nix flake update && home-manager switch --flake .#user # update + apply
```
Inspect without building:
```sh
nix eval .#packages.x86_64-linux.default.pname
```
### Inputs (currently pinned)
- `nixpkgs` — `nixpkgs-unstable`, rev `39ad350a…`.
- `home-manager` — rev `dfadbe5…`, follows this `nixpkgs`.
- `tinfoil-proxy` — `path:./tinfoil-proxy` (local sub-flake).
## How configuration is managed
Home Manager drives everything from `home/default.nix` via three mechanisms:
1. **Files linked from this repo** — `home.file.…source = ../config/<file>`.
Editing a file in `config/` and re-applying updates the symlink target in
`~/.config`. Currently linked: `starship.toml`, `nix/nix.conf`,
`opencode/opencode.jsonc`.
2. **Program modules** — `programs.<name>`. Prefer these over raw dotfiles.
3. **Environment variables** — `home.sessionVariables`.
The `tinfoil-proxy` user service is declared at
`systemd.user.services.tinfoil-proxy` and starts at login/boot (linger is
enabled).
## Conventions
- **Declarative first.** Add tools to `home.packages`; link config via
`home.file`; use `programs.<name>` rather than hand-editing files in `$HOME`.
- Use 2-space indentation in Nix, keep trailing newlines, and match the
existing concise style. Do not add comments unless they add real value.
- When renaming/moving config, keep the `config/` filename, the `home.file`
target path, and the README in sync.
- Keep `"$schema": "https://opencode.ai/config.json"` at the top of
`config/opencode.jsonc`.
- Username and system are hardcoded in **both** `flake.nix` and
`tinfoil-proxy/flake.nix`; keep them consistent when either changes.
## Guardrails
- **Do not run `home-manager switch`, `sudo ./install.sh`, or `git commit`
unless explicitly asked.** Propose the command instead.
- Never commit secrets. `TINFOIL_API_KEY` is injected via `{env:...}`; keep it
out of the repo and the Nix store.
- Do not remove `flake.lock` from tracking or add build outputs (`result*`) to
git (already ignored by `.gitignore`).
- Do not introduce a formatter/linter/CI unless asked.
## Gotchas
- `packages.default` in the root flake **is** `tinfoil-proxy`, not the config.
- An overlay injects `tinfoil-proxy` into `pkgs`, which is how
`home/default.nix` refers to `pkgs.tinfoil-proxy`.
- Interactive bash `exec fish`, so fish (not bash) reads most interactive
config; `home.sessionVariables` exports `NIX_SHELL_PRESERVE_PROMPT=true`.
- `install.sh` only compares/installs `config/nix.conf`; it backs up any
differing `/etc/nix/nix.conf` to `/etc/nix/nix.conf.bak.<timestamp>`.
## OpenCode
- `config/opencode.jsonc` declares the `tinfoil` provider via
`@ai-sdk/openai-compatible`, pointing at the local proxy
`http://127.0.0.1:3301/v1`, with `apiKey: {env:TINFOIL_API_KEY}`.
- Model IDs and context/output limits are listed under `provider.tinfoil.models`.
Update that block to change available models.
- `~/.config/opencode/package.json`, `package-lock.json`, and `node_modules/`
are **local and unmanaged** (gitignored) — Home Manager only owns
`opencode.jsonc`.
- opencode reads config once at startup; **restart opencode** after changing
any config, agent, or skill file.
- This `AGENTS.md` is auto-loaded as project context.
## Git
- Default branch: `main`. No remote is configured.
- Commit style: short, imperative, capitalized subject (e.g.
`Adopt Home Manager; manage starship, nix.conf, and opencode config`).
- Only commit when explicitly asked.
## Reference
`README.md` is the user-facing guide (setup, customization, maintenance). Keep
it accurate when changing structure or commands.
LICENSE
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contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
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If conditions are imposed on you (whether by court order, agreement or
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not convey it at all. For example, if you agree to terms that obligate you
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the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
supports such interaction) an opportunity to receive the Corresponding
Source of your version by providing access to the Corresponding Source
from a network server at no charge, through some standard or customary
means of facilitating copying of software. This Corresponding Source
shall include the Corresponding Source for any work covered by version 3
of the GNU General Public License that is incorporated pursuant to the
following paragraph.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the work with which it is combined will remain governed by version
3 of the GNU General Public License.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU Affero General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU Affero General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU Affero General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
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15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
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GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.
README.md
+143 -34
View File
@@ -1,53 +1,162 @@
# nix-clanker-vm # nix-clanker-vm
Nix configuration for this host (a Debian VM with standalone Nix). Nix flake + [Home Manager](https://github.com/nix-community/home-manager)
configuration for this host: a Debian VM running **standalone Nix**
(non-NixOS).
## What's here ## Overview
- `flake.nix` — root flake: aggregates packages and the Home Manager config. - Declarative, reproducible user environment managed by Home Manager.
- `tinfoil-proxy/` — self-contained flake packaging `tinfoil-proxy` (Go). - A self-contained `tinfoil-proxy` package flake (Go).
- `home/` — Home Manager configuration (user `user`): bash, shell env, - System-wide Nix settings applied separately via `install.sh`.
starship (declarative init), user-level nix.conf, installed packages
(opencode), managed opencode config.
- `config/nix.conf` — source of truth for Nix settings (`sandbox`, flakes).
- `config/starship.toml` — the host's starship preset (nerd-font-symbols).
- `config/opencode.jsonc` — global opencode config, managed via `home.file`.
- `install.sh` — applies `config/nix.conf` system-wide (sudo, backs up).
## Apply ## Prerequisites
- x86_64 Linux.
- Nix with `nix-command` and `flakes` enabled (see `config/nix.conf`).
- `home-manager` available on `PATH`.
- `sudo` access for the system-wide `/etc/nix/nix.conf` step.
## Quick start
```sh ```sh
sudo ./install.sh # update /etc/nix/nix.conf git clone <your-repo-url> ~/nix
home-manager --flake ~/nix#user switch cd ~/nix
sudo ./install.sh # install /etc/nix/nix.conf (backs up)
home-manager switch --flake .#user # apply the Home Manager config
``` ```
The user-level `~/.config/nix/nix.conf` is managed by Home Manager via ## Repository layout
`home.file` in `home/default.nix`; the shell environment is owned by
`programs.bash` (plus `hm-session-vars.sh`).
## Build | Path | Purpose |
| ------------------------- | -------------------------------------------------------------- |
| `flake.nix` | Root flake: packages and the Home Manager configuration. |
| `home/default.nix` | Home Manager config for user `user` (packages, programs, the `tinfoil-proxy` user service). |
| `config/` | Source files linked into `~/.config` (nix, starship, opencode incl. the Tinfoil provider). |
| `tinfoil-proxy/` | Self-contained flake packaging `tinfoil-proxy` (Go). |
| `install.sh` | Applies `config/nix.conf` to `/etc/nix/nix.conf` (sudo). |
| `flake.lock` | Pinned input revisions (tracked for reproducibility). |
## Managing packages
Packages are declared in `home.packages` in `home/default.nix`. To add one,
append it to the list and re-apply:
```nix
home.packages = [
pkgs.ripgrep # example: add whatever you need
];
```
```sh ```sh
nix build ~/nix home-manager switch --flake .#user
nix build ~/nix/tinfoil-proxy
``` ```
## Push to Codeberg To remove a package, delete its entry and re-run the same command. The
authoritative, always-current list lives in `home/default.nix`.
For one-off, ad-hoc use outside the managed environment:
```sh ```sh
git remote add origin git@codeberg.org:kawaiipunk/nix-clanker-vm.git nix shell nixpkgs#<package>
git branch -M main
git push -u origin main
``` ```
## Notes ## Managing configuration
- `sandbox = true` is a restricted setting; when supplied from the user-level Home Manager drives configuration through three mechanisms in
config it is ignored with a warning (the daemon enforces it from `home/default.nix`:
`/etc/nix/nix.conf`). This is cosmetic.
- Existing pre-Home-Manager dotfiles are no longer kept as backups; the shell is - **Files linked from this repo** via `home.file`. Add an entry to link a
fully owned by `programs.bash` + `programs.starship` (session vars from file from `config/` into your home directory:
`hm-session-vars.sh`).
- `/etc/profile.d/zzbubbles.sh` is a stale, unmanaged start-of-day script that ```nix
duplicates starship init and references a removed `/home/runner` path. Remove home.file.".config/foo/foo.conf".source = ../config/foo.conf;
it once (sudo): `sudo rm /etc/profile.d/zzbubbles.sh`. ```
- **Program modules** via `programs.<name>` (e.g. `programs.bash`,
`programs.fish`, `programs.tmux`, `programs.starship`). Enable or
customize a module here instead of editing dotfiles by hand.
- **Environment variables** via `home.sessionVariables`.
Apply any change with:
```sh
home-manager switch --flake .#user
```
## Customization
The config is host-specific. Current values and where to change them:
| Setting | File | Current value |
| ---------------- | ------------------- | --------------- |
| Username | `flake.nix` | `"user"` |
| Username | `home/default.nix` | `"user"` |
| Home directory | `home/default.nix` | `"/home/user"` |
| System | `flake.nix` | `"x86_64-linux"`|
| System | `tinfoil-proxy/flake.nix` | `"x86_64-linux"` |
- **Change the username**: update `username` in `flake.nix` and both
`home.username` / `home.homeDirectory` in `home/default.nix`. The Home
Manager flake attribute name is derived from `username`, so the apply
command becomes `home-manager switch --flake .#<newuser>`.
- **Change the system**: update `system` in `flake.nix` and in
`tinfoil-proxy/flake.nix`.
## The `tinfoil-proxy` package
`tinfoil-proxy/` is an independent flake that packages the Go program
`tinfoil-proxy` (a verified local HTTP proxy to a Tinfoil secure enclave).
Version, source hash, and vendor hash live in `tinfoil-proxy/package.nix`.
```sh
nix build ./tinfoil-proxy
```
## Tinfoil models in OpenCode
The managed OpenCode config (`config/opencode.jsonc`) defines a `tinfoil`
provider that points at the local proxy on `http://127.0.0.1:3301/v1`. Every
request is checked against Tinfoil's attestation transparency log before it
reaches a secure enclave.
The proxy is installed as a systemd user service and starts automatically
(linger is enabled, so it also starts at boot):
```sh
systemctl --user status tinfoil-proxy
```
To authenticate:
1. Get an API key from the [Tinfoil dashboard](https://dash.tinfoil.sh).
2. Export it in your shell. It is read via `{env:TINFOIL_API_KEY}`, so it is
never stored in this repo or the Nix store:
```sh
export TINFOIL_API_KEY=tk_...
```
3. Start OpenCode, run `/models`, and pick a model under **Tinfoil**.
The available models are listed in `config/opencode.jsonc`; update that file
and re-apply to change them.
## Maintenance
Update pinned inputs and re-apply:
```sh
nix flake update
home-manager switch --flake .#user
```
A `warning: Git tree '...' is dirty` message is expected while you have
uncommitted changes; it does not affect the build.
## License
Licensed under the [GNU Affero General Public License v3.0](LICENSE)
(AGPL-3.0-only).
config/opencode.jsonc
+43 -2
View File
@@ -1,3 +1,44 @@
{ {
"$schema": "https://opencode.ai/config.json" "$schema": "https://opencode.ai/config.json",
} "share": "disabled",
"provider": {
"tinfoil": {
"npm": "@ai-sdk/openai-compatible",
"name": "Tinfoil",
"options": {
"baseURL": "http://127.0.0.1:3301/v1",
"apiKey": "{env:TINFOIL_API_KEY}"
},
"models": {
"kimi-k3": {
"name": "Kimi K3",
"limit": { "context": 256000, "output": 65536 }
},
"glm-5-3": {
"name": "GLM-5.3",
"limit": { "context": 1000000, "output": 65536 }
},
"glm-5-3-flash": {
"name": "GLM-5.3 Flash",
"limit": { "context": 1000000, "output": 65536 }
},
"deepseek-v4-1-flash": {
"name": "DeepSeek V4.1 Flash",
"limit": { "context": 1000000, "output": 65536 }
},
"gemma4-31b": {
"name": "Gemma 4 31B",
"limit": { "context": 256000, "output": 32768 }
},
"gpt-oss-120b": {
"name": "GPT-OSS 120B",
"limit": { "context": 131072, "output": 32768 }
},
"llama3-3-70b": {
"name": "Llama 3.3 70B",
"limit": { "context": 128000, "output": 32768 }
}
}
}
}
}
flake.nix
+8 -1
View File
@@ -13,7 +13,14 @@
outputs = { self, nixpkgs, home-manager, tinfoil-proxy }: outputs = { self, nixpkgs, home-manager, tinfoil-proxy }:
let let
system = "x86_64-linux"; system = "x86_64-linux";
pkgs = nixpkgs.legacyPackages.${system}; pkgs = import nixpkgs {
inherit system;
overlays = [
(final: prev: {
tinfoil-proxy = tinfoil-proxy.packages.${system}.default;
})
];
};
username = "user"; username = "user";
in { in {
packages.${system} = { packages.${system} = {
home/default.nix
+27 -1
View File
@@ -7,6 +7,9 @@
home.packages = [ home.packages = [
pkgs.opencode pkgs.opencode
pkgs.ncdu
pkgs.nano
pkgs.tinfoil-proxy
]; ];
home.file = { home.file = {
@@ -19,7 +22,30 @@
NIX_SHELL_PRESERVE_PROMPT = "true"; NIX_SHELL_PRESERVE_PROMPT = "true";
}; };
programs.bash.enable = true; programs.bash = {
enable = true;
initExtra = ''
if [[ $- == *i* ]]; then
exec fish
fi
'';
};
programs.fish.enable = true;
programs.tmux.enable = true;
programs.starship.enable = true; programs.starship.enable = true;
programs.home-manager.enable = true; programs.home-manager.enable = true;
systemd.user.services.tinfoil-proxy = {
Unit = {
Description = "Tinfoil local proxy (verified connection to Tinfoil enclaves)";
After = [ "network-online.target" ];
Wants = [ "network-online.target" ];
};
Service = {
ExecStart = "${pkgs.tinfoil-proxy}/bin/tinfoil-proxy";
Restart = "on-failure";
RestartSec = 5;
};
Install.WantedBy = [ "default.target" ];
};
} }