From 409da8512403a16874053b26e0b6997af7260a76 Mon Sep 17 00:00:00 2001
From: Surma <surma@surma.dev>
Date: Fri, 6 Nov 2026 15:14:49 +0000
Subject: [PATCH] v3: host crate skeleton, userland workspace, AGENTS.md for v3

The workspace is now host/ and vfs/. v2 crates leave the workspace as reference.
host/src/exec.rs is the contract between the process table and the harness.
---
 AGENTS.md                   |  84 +--
 Cargo.lock                  | 988 +-----------------------------------
 Cargo.toml                  |  11 +-
 host/Cargo.toml             |  16 +
 host/src/exec.rs            |  37 ++
 host/src/harness/mod.rs     |   8 +
 host/src/lib.rs             |   7 +
 host/src/main.rs            |  33 ++
 host/src/process/mod.rs     |   8 +
 host/src/world.rs           |  18 +
 userland/.cargo/config.toml |   2 +
 userland/Cargo.toml         |   7 +
 12 files changed, 192 insertions(+), 1027 deletions(-)
 create mode 100644 host/Cargo.toml
 create mode 100644 host/src/exec.rs
 create mode 100644 host/src/harness/mod.rs
 create mode 100644 host/src/lib.rs
 create mode 100644 host/src/main.rs
 create mode 100644 host/src/process/mod.rs
 create mode 100644 host/src/world.rs
 create mode 100644 userland/.cargo/config.toml
 create mode 100644 userland/Cargo.toml

diff --git a/AGENTS.md b/AGENTS.md
index 5ac9c98..31cf10f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -1,56 +1,66 @@
-# Working on Sausage
+# Working on Sausage (v3)
 
-Sausage is meant to be read and changed by agents, including its own agent.
-Keep it that way.
+Sausage is a world of WASI programs and durable agents. It is meant to be read and changed by agents,
+including its own. Keep it that way.
+
+This branch (`v3`) rebuilds Sausage. The plan and its decisions (D1, D2, …) are in
+`~/research/sausage-v3/PLAN.md`. `PROTOCOL.md`, `DECISIONS.md` and `README.md` still describe v2.
+
+## The boundary
+
+- **The world is the sandbox.** Everything inside the world sees and changes the whole world. Do not add
+  inner boundaries, permissions or per-agent views. The VFS is a safety net against mistakes, not a wall
+  against attackers.
+- **Host calls pierce the sandbox.** The only host import beyond standard WASI is the process interface
+  (spawn, wait, kill). Do not add another one. Everything else uses standard WASI 0.2 interfaces: files
+  through the VFS, `wasi:http` (the host API on its reserved host name, credential injection, signing),
+  and `wasi:sockets`.
+- **The credentials manager in the host is the one real security boundary.** Secrets never enter the
+  world. Approvals need a passkey.
+- **Native code is the exception.** The only native work for the world is the Rust builder, and it runs in
+  user, mount and network namespaces.
 
 ## Priorities
 
-1. **Correct.** Every behavior in `PROTOCOL.md` has a test in `cli/tests/host/`.
-2. **Simple and short.** Prefer the obvious code. No abstraction for one
-   caller. No configuration that nobody asked for.
-3. **Readable.** A new reader must understand a file without the others.
-   Each module starts with a doc comment that says what it owns.
-4. **Efficient** on the paths that run per call.
-5. **Raw and minimal.** Sausage has no permissions, sandboxing beyond WASI,
-   limits, or authentication. Do not add them to the core. Add nothing to
-   the host that a plugin (or the agent, by changing itself) could do.
+1. **Correct.** Every behavior has a test.
+2. **Simple and short.** Prefer the obvious code. No abstraction for one caller. No configuration that
+   nobody asked for.
+3. **Readable.** A new reader must understand a file without the others. Each module starts with a doc
+   comment that says what it owns.
+4. **Efficient** on the paths that run per command and per model turn.
 
 ## Layout
 
-- `cli/`: the host (`sausage` binary and library): the core, the native
-  `cargo` plugin, the WASI test runner, and the console.
-- `vfs/`: `sausage-vfs`, the virtual filesystem for WASI guests. It knows
-  nothing about Sausage.
-- `interface/`: `sausage-interface`: OpenRPC documents, the compatibility
-  check, and the generator of client code.
-- `sdk/`: `sausage-plugin`, the SDK for Rust plugins, and `sdk/macros/`, its
-  macros. Never published: `cargo` points `sausage-plugin = "0.1"` at its
-  local copy.
-- `agent/`: the agent plugin. `sausage init` embeds and builds it.
-- `examples/`: small plugins. They are not workspace members.
-- `PROTOCOL.md`: the contract between the core and the plugins. Change it in
-  the same commit as the behavior. `DECISIONS.md` says why; when the two
-  disagree, `PROTOCOL.md` and the code win.
+- `host/`: the host crate (package and binary `sausage`): the world, the process table, the harness.
+  `host/src/exec.rs` is the contract between the harness and the process table.
+- `vfs/`: `sausage-vfs`, the virtual filesystem for WASI guests and for host code. It knows nothing
+  about Sausage. Host code reads and writes the world only through it.
+- `userland/`: the default CLIs of a world, a separate workspace built for `wasm32-wasip2`.
+- `spikes/`: accepted prototypes. Read them for evidence, copy from them, do not build on them.
+- `cli/`, `interface/`, `sdk/`, `agent/`, `examples/`: v2 code, outside the workspace. Copy what v3
+  needs. They are deleted at the end of P1.
+
+## Programs in the world
+
+- Agents write CLIs and servers. That they are WASI binaries is a detail, not a concept to explain.
+- The platform is WASI 0.2 components. Rust programs build for `wasm32-wasip2`. WASI 0.1 programs run
+  through an adapter.
 
 ## Checks
 
 ```sh
-nix flake check -L      # all tests below; CI runs this on every push
-nix develop -c cargo test --workspace     # fast with a warm cache: run it during development
-nix develop -c cargo test -p sausage --test host -- core::   # one topic of the host tests
-nix develop -c cargo build --release -p agent --target wasm32-wasip2
-nix develop -c cargo clippy --workspace
+nix develop -c cargo test --workspace     # host and vfs
+nix develop -c cargo clippy --workspace --all-targets -- -D warnings
+nix develop -c cargo build --manifest-path userland/Cargo.toml --release
 ```
 
-`nix run -- init` and `nix run -- run` must keep working without other
-setup.
+`nix flake check` still describes v2 and is updated later in P1.
 
 Tests must stay fast:
 
 - Only a few tests may wait for a timing (grace periods, deadlines).
 - Poll for a condition with a deadline. Do not sleep.
 - Do not test unrealistic load, such as many fast cycles.
-- `#[ignore]` only disables a test for a short time, with the reason in the
-  attribute.
-- Tests that build plugins use the persistent cache in
-  `env!("CARGO_TARGET_TMPDIR")`.
+- `#[ignore]` only disables a test for a short time, with the reason in the attribute.
+- Tests that build or compile guests use a persistent cache (for example under
+  `env!("CARGO_TARGET_TMPDIR")`), so a warm run does not compile again.
diff --git a/Cargo.lock b/Cargo.lock
index 6277921..b89d4b6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,17 +11,6 @@ dependencies = [
  "gimli",
 ]
 
-[[package]]
-name = "agent"
-version = "0.1.0"
-dependencies = [
- "sausage-plugin",
- "serde",
- "serde_json",
- "serde_yaml_ng",
- "wstd",
-]
-
 [[package]]
 name = "allocator-api2"
 version = "0.2.21"
@@ -34,15 +23,6 @@ version = "0.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e9d4ee0d472d1cd2e28c97dfa124b3d8d992e10eb0a035f33f5d12e3a177ba3b"
 
-[[package]]
-name = "android_system_properties"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae221649c9976a6f6c56ae1facf410f3ddb33cc661c4b7b61020a912d4237fbc"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "anstream"
 version = "1.0.0"
@@ -105,12 +85,6 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3bc62ac97cc33321f50863d514c3bc38a453947a8f9e781137e47c7401020aed"
 
-[[package]]
-name = "async-task"
-version = "4.7.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b75356056920673b02621b35afd0f7dda9306d03c79a30f5c56c44cf256e3de"
-
 [[package]]
 name = "async-trait"
 version = "0.1.92"
@@ -122,12 +96,6 @@ dependencies = [
  "syn 3.0.9",
 ]
 
-[[package]]
-name = "atomic-waker"
-version = "1.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
-
 [[package]]
 name = "autocfg"
 version = "1.5.1"
@@ -290,17 +258,6 @@ dependencies = [
  "rand_core",
 ]
 
-[[package]]
-name = "chrono"
-version = "0.4.45"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aa79e62e7697b8e29b513a68abacf485adcd1fe8284a4316c5ae868e6633327"
-dependencies = [
- "iana-time-zone",
- "num-traits",
- "windows-link",
-]
-
 [[package]]
 name = "clap"
 version = "4.6.7"
@@ -341,15 +298,6 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1c133bc6a41be0d194c306b5506d15e6feeea7b1d6604bd3f8310dfb2ca96486"
 
-[[package]]
-name = "clipboard-win"
-version = "5.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bde03770d3df201d4fb868f2c9c59e66a3e4e2bd06692a0fe701e7103c7e84d4"
-dependencies = [
- "error-code",
-]
-
 [[package]]
 name = "cobs"
 version = "0.3.0"
@@ -365,12 +313,6 @@ version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
 
-[[package]]
-name = "core-foundation-sys"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
-
 [[package]]
 name = "core_detect"
 version = "1.0.0"
@@ -645,12 +587,6 @@ dependencies = [
  "syn 3.0.9",
 ]
 
-[[package]]
-name = "dyn-clone"
-version = "1.0.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0881ea181b1df73ff77ffaaf9c7544ecc11e82fba9b5f27b262a3c73a332555"
-
 [[package]]
 name = "either"
 version = "1.19.0"
@@ -683,12 +619,6 @@ dependencies = [
  "simdutf8",
 ]
 
-[[package]]
-name = "endian-type"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "869b0adbda23651a9c5c0c3d270aac9fcb52e8622a8f2b17e57802d7791962f2"
-
 [[package]]
 name = "equivalent"
 version = "1.0.3"
@@ -705,12 +635,6 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "error-code"
-version = "3.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b5343afd4a8365a643ac588dab4cf234a190c7f6c88c9f6dd6ffe00837661b7"
-
 [[package]]
 name = "fallible-iterator"
 version = "0.3.0"
@@ -723,15 +647,6 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
 
-[[package]]
-name = "fastrand"
-version = "1.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
-dependencies = [
- "instant",
-]
-
 [[package]]
 name = "fastrand"
 version = "2.5.0"
@@ -782,15 +697,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "fsevent-sys"
-version = "4.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "76ee7a02da4d231650c7cea31349b889be2f45ddb3ef3032d2ec8185f6313fd2"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "futures"
 version = "0.3.34"
@@ -799,7 +705,6 @@ checksum = "9a31d2a3fbaaeb2af2368bbdd904aa8e812d3c04a1ee10d3171f52d556e5d0a3"
 dependencies = [
  "futures-channel",
  "futures-core",
- "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -822,49 +727,12 @@ version = "0.3.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92d699e522242e69e3003b94ecc1f960f3a5e015aa7c5d7486e65ad01dd94f5e"
 
-[[package]]
-name = "futures-executor"
-version = "0.3.34"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "031b47cf1a3c6cc8bc2fc76cd437f521619387907d469316e7c0bc278f1f5432"
-dependencies = [
- "futures-core",
- "futures-task",
- "futures-util",
-]
-
 [[package]]
 name = "futures-io"
 version = "0.3.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53c0fa8157de1303bfffdaa1cc2a673bfffb60102f76b0ef4441659124373fed"
 
-[[package]]
-name = "futures-lite"
-version = "1.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49a9d51ce47660b1e808d3c990b4709f2f415d928835a17dfd16991515c46bce"
-dependencies = [
- "fastrand 1.9.0",
- "futures-core",
- "futures-io",
- "memchr",
- "parking",
- "pin-project-lite",
- "waker-fn",
-]
-
-[[package]]
-name = "futures-macro"
-version = "0.3.34"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fb9654ba8355388abeb8dcb4fc62f511300867002afc858860463bdd9fe0c44"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 3.0.9",
-]
-
 [[package]]
 name = "futures-sink"
 version = "0.3.34"
@@ -886,7 +754,6 @@ dependencies = [
  "futures-channel",
  "futures-core",
  "futures-io",
- "futures-macro",
  "futures-sink",
  "futures-task",
  "memchr",
@@ -953,39 +820,12 @@ dependencies = [
  "stable_deref_trait",
 ]
 
-[[package]]
-name = "glob"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e4eba85ea1d0a966a983acd07deee566e67395d2d96b6fb39e62b5a833f1eb0b"
-
-[[package]]
-name = "h2"
-version = "0.4.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d29020232d6aa3fb1daca64c1127cf662cf97f254ae16c18c05b8ab635fc118"
-dependencies = [
- "atomic-waker",
- "bytes",
- "fnv",
- "futures-core",
- "futures-sink",
- "http",
- "indexmap",
- "slab",
- "tokio",
- "tokio-util",
- "tracing",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
 dependencies = [
- "allocator-api2",
- "equivalent",
  "foldhash",
 ]
 
@@ -1015,120 +855,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "home"
-version = "0.5.12"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc627f471c528ff0c4a49e1d5e60450c8f6461dd6d10ba9dcd3a61d3dff7728d"
-dependencies = [
- "windows-sys 0.61.2",
-]
-
-[[package]]
-name = "http"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "918d3568bebf352712bc2ef3d46a8bcf1a75b373be6539de198e9105cbbf9ce0"
-dependencies = [
- "bytes",
- "itoa",
-]
-
-[[package]]
-name = "http-body"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2a8f2913ee65f60facd6a5905613afaa448497a0230cc41ce022d93290bc2c"
-dependencies = [
- "bytes",
- "http",
-]
-
-[[package]]
-name = "http-body-util"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23169fe34a5fbcdd3f3862e78fb9b6fccd5f02a6dc6f732547005d45631ce71c"
-dependencies = [
- "bytes",
- "futures-core",
- "http",
- "http-body",
- "pin-project-lite",
-]
-
-[[package]]
-name = "httparse"
-version = "1.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6dbf3de79e51f3d586ab4cb9d5c3e2c14aa28ed23d180cf89b4df0454a69cc87"
-
-[[package]]
-name = "httpdate"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
-
-[[package]]
-name = "hyper"
-version = "1.12.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c3e324da4c95177d6291d4c8730197c0d1822f8a9766814a4a44fa5ab797c9c"
-dependencies = [
- "atomic-waker",
- "bytes",
- "futures-channel",
- "futures-core",
- "h2",
- "http",
- "http-body",
- "httparse",
- "httpdate",
- "itoa",
- "pin-project-lite",
- "smallvec",
- "tokio",
- "want",
-]
-
-[[package]]
-name = "hyper-util"
-version = "0.1.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ddc03d96684f9226b8a787cdb71488417b53ab5ea8fdb1dac946cb9431cc8bff"
-dependencies = [
- "bytes",
- "http",
- "http-body",
- "hyper",
- "pin-project-lite",
- "tokio",
-]
-
-[[package]]
-name = "iana-time-zone"
-version = "0.1.65"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
-dependencies = [
- "android_system_properties",
- "core-foundation-sys",
- "iana-time-zone-haiku",
- "js-sys",
- "log",
- "wasm-bindgen",
- "windows-core",
-]
-
-[[package]]
-name = "iana-time-zone-haiku"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "icu_collections"
 version = "2.3.0"
@@ -1239,25 +965,6 @@ dependencies = [
  "icu_properties",
 ]
 
-[[package]]
-name = "include_dir"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "923d117408f1e49d914f1a379a309cffe4f18c05cf4e3d12e613a15fc81bd0dd"
-dependencies = [
- "include_dir_macros",
-]
-
-[[package]]
-name = "include_dir_macros"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7cab85a7ed0bd5f0e76d93846e0147172bed2e2d3f859bcc33a8d9699cad1a75"
-dependencies = [
- "proc-macro2",
- "quote",
-]
-
 [[package]]
 name = "indexmap"
 version = "2.14.2"
@@ -1270,44 +977,6 @@ dependencies = [
  "serde_core",
 ]
 
-[[package]]
-name = "inotify"
-version = "0.11.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cc00ea907cab49550b7da656f80ebb97be1b997d931fbcd28d39734e17ce592"
-dependencies = [
- "bitflags",
- "inotify-sys",
- "libc",
-]
-
-[[package]]
-name = "inotify-sys"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c033f80b2c113cdf91ab7a33faa9cbc014726dcad99880c8609af2a370edf37d"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "instant"
-version = "0.1.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0242819d153cba4b4b05a5a8f2a7e9bbf97b6055b2a002b395c96b5ff3c0222"
-dependencies = [
- "cfg-if",
-]
-
-[[package]]
-name = "inventory"
-version = "0.3.25"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "rustversion",
-]
-
 [[package]]
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@@ -1398,26 +1067,6 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
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-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d763e5b24120b4ddf50de6c92308156765aabfbbccebf401da7cff2d70a41ea"
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- "libc",
-]
-
-[[package]]
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-dependencies = [
- "bitflags",
- "libc",
-]
-
 [[package]]
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 version = "0.2.7"
@@ -1523,7 +1172,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1788edb87fdc09c7e26304471e2f5be8cdefb1b6930d6e3985fc02ff53bf86ee"
 dependencies = [
  "libc",
- "log",
  "wasi",
  "windows-sys 0.61.2",
 ]
@@ -1534,54 +1182,6 @@ version = "1.0.0"
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 checksum = "743fb55ba31b18fb1ecef6bdc9aa2743314978ac084044301a7eee33fb99a20d"
 
-[[package]]
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-dependencies = [
- "smallvec",
-]
-
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- "cfg-if",
- "cfg_aliases",
- "libc",
-]
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-dependencies = [
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- "libc",
- "log",
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-
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-dependencies = [
- "bitflags",
-]
-
 [[package]]
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@@ -1615,12 +1215,6 @@ version = "1.70.2"
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-[[package]]
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-
 [[package]]
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@@ -1693,16 +1287,6 @@ dependencies = [
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 ]
 
-[[package]]
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-dependencies = [
- "proc-macro2",
- "syn 2.0.119",
-]
-
 [[package]]
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@@ -1785,16 +1369,6 @@ version = "6.0.0"
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 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
-[[package]]
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-dependencies = [
- "endian-type",
- "nibble_vec",
-]
-
 [[package]]
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@@ -1861,26 +1435,6 @@ dependencies = [
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 ]
 
-[[package]]
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-version = "1.0.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e440fb4e4b4147295338efb76001ab9e4efc0e5839df2c47fc5ac2381d365c3"
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-
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- "quote",
- "syn 3.0.9",
-]
-
 [[package]]
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@@ -1902,30 +1456,6 @@ version = "0.8.11"
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 checksum = "d6f6ff9a378485b298a5286656da665ba74413d36db0979633275d2e708145d4"
 
-[[package]]
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- "memchr",
-]
-
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-dependencies = [
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- "cfg-if",
- "getrandom 0.2.17",
- "libc",
- "untrusted",
- "windows-sys 0.52.0",
-]
-
 [[package]]
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 version = "0.1.1"
@@ -1986,41 +1516,6 @@ dependencies = [
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 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
- "log",
- "once_cell",
- "ring",
- "rustls-pki-types",
- "rustls-webpki",
- "subtle",
- "zeroize",
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-
-[[package]]
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-dependencies = [
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-
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-dependencies = [
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- "rustls-pki-types",
- "untrusted",
-]
-
 [[package]]
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 version = "1.0.23"
@@ -2039,113 +1534,15 @@ dependencies = [
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 ]
 
-[[package]]
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- "home",
- "libc",
- "log",
- "memchr",
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- "radix_trie",
- "unicode-segmentation",
- "unicode-width",
- "utf8parse",
- "windows-sys 0.61.2",
-]
-
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-
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-dependencies = [
- "winapi-util",
-]
-
 [[package]]
 name = "sausage"
-version = "0.1.0"
+version = "0.3.0"
 dependencies = [
  "anyhow",
- "bytes",
- "chrono",
+ "async-trait",
  "clap",
- "http",
- "http-body-util",
- "hyper",
- "hyper-util",
- "include_dir",
- "nix",
- "notify",
- "rusqlite",
- "rustyline",
- "sausage-interface",
  "sausage-vfs",
- "serde",
- "serde_json",
- "serde_yaml_ng",
- "sha2",
- "tempfile",
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- "toml_edit",
- "uuid",
- "wasmtime",
- "wasmtime-wasi",
- "wasmtime-wasi-http",
-]
-
-[[package]]
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-dependencies = [
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- "proc-macro2",
- "proptest",
- "quote",
- "schemars 0.8.22",
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- "serde",
- "serde_json",
- "syn 2.0.119",
- "typify",
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-
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-dependencies = [
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- "schemars 1.2.3",
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- "trybuild",
- "wstd",
-]
-
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-dependencies = [
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- "quote",
- "sausage-interface",
- "serde_json",
- "syn 2.0.119",
 ]
 
 [[package]]
@@ -2165,55 +1562,6 @@ dependencies = [
  "wasmtime-wasi",
 ]
 
-[[package]]
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-version = "0.8.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-dependencies = [
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- "serde",
- "serde_json",
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-
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-dependencies = [
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- "syn 2.0.119",
-]
-
-[[package]]
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-dependencies = [
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- "serde_derive_internals 0.30.0",
- "syn 3.0.9",
-]
-
 [[package]]
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 version = "1.2.0"
@@ -2260,28 +1608,6 @@ dependencies = [
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 ]
 
-[[package]]
-name = "serde_derive_internals"
-version = "0.29.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "quote",
- "syn 2.0.119",
-]
-
-[[package]]
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-dependencies = [
- "proc-macro2",
- "quote",
- "syn 3.0.9",
-]
-
 [[package]]
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 version = "1.0.154"
@@ -2304,31 +1630,6 @@ dependencies = [
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 ]
 
-[[package]]
-name = "serde_tokenstream"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7c49585c52c01f13c5c2ebb333f14f6885d76daa768d8a037d28017ec538c69"
-dependencies = [
- "proc-macro2",
- "quote",
- "serde",
- "syn 2.0.119",
-]
-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "itoa",
- "ryu",
- "serde",
- "unsafe-libyaml",
-]
-
 [[package]]
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 version = "0.10.9"
@@ -2411,12 +1712,6 @@ version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
 name = "syn"
 version = "2.0.119"
@@ -2456,19 +1751,13 @@ version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "adb6935a6f5c20170eeceb1a3835a49e12e19d792f6dd344ccc76a985ca5a6ca"
 
-[[package]]
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-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
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 checksum = "32497e9a4c7b38532efcdebeef879707aa9f794296a4f0244f6f69e9bc8574bd"
 dependencies = [
- "fastrand 2.5.0",
+ "fastrand",
  "getrandom 0.4.3",
  "once_cell",
  "rustix",
@@ -2562,30 +1851,6 @@ dependencies = [
  "syn 3.0.9",
 ]
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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- "tokio",
-]
-
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-dependencies = [
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- "libc",
- "pin-project-lite",
- "tokio",
-]
-
 [[package]]
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 version = "1.1.8+spec-1.1.0"
@@ -2619,7 +1884,6 @@ dependencies = [
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  "toml_datetime",
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- "toml_writer",
  "winnow",
 ]
 
@@ -2669,80 +1933,12 @@ dependencies = [
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 ]
 
-[[package]]
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-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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-dependencies = [
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- "toml",
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 [[package]]
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-[[package]]
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-dependencies = [
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- "typify-macro",
-]
-
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-dependencies = [
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- "thiserror 2.0.21",
- "unicode-ident",
-]
-
-[[package]]
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-dependencies = [
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- "syn 2.0.119",
- "typify-impl",
-]
-
 [[package]]
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@@ -2755,30 +1951,12 @@ version = "1.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2c754d6c33795a1c324727428e5a7dedb5b06195f9890bdbcba760d3e246563"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
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 checksum = "b4ac048d71ede7ee76d585517add45da530660ef4390e49b098733c6e897f254"
 
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
 [[package]]
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@@ -2809,7 +1987,6 @@ version = "1.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7cc1186384beb7dd8eedea376413fd654937285ea6c9cfbb928dc3043ea4b606"
 dependencies = [
- "getrandom 0.4.3",
  "js-sys",
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 ]
@@ -2835,31 +2012,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "waker-fn"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "317211a0dc0ceedd78fb2ca9a44aed3d7b9b26f81870d485c07122b4350673b7"
-
-[[package]]
-name = "walkdir"
-version = "2.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
-dependencies = [
- "same-file",
- "winapi-util",
-]
-
-[[package]]
-name = "want"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec4cdd0dd910afe868b7ef477227d8d538b46b3075031afee8a9f2acb0a2ed0b"
-dependencies = [
- "try-lock",
-]
-
 [[package]]
 name = "wasi"
 version = "0.11.1+wasi-snapshot-preview1"
@@ -3266,31 +2418,6 @@ dependencies = [
  "winx",
 ]
 
-[[package]]
-name = "wasmtime-wasi-http"
-version = "49.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9248a9ab044a9a4f414afdd14ffb38d7c58d4e2cc0f119ace9464d698f6f3bde"
-dependencies = [
- "async-trait",
- "bytes",
- "futures",
- "http",
- "http-body",
- "http-body-util",
- "hyper",
- "pin-project-lite",
- "rustls",
- "tokio",
- "tokio-rustls",
- "tokio-util",
- "tracing",
- "wasmtime",
- "wasmtime-wasi",
- "wasmtime-wasi-io",
- "webpki-roots",
-]
-
 [[package]]
 name = "wasmtime-wasi-io"
 version = "49.0.3"
@@ -3335,15 +2462,6 @@ dependencies = [
  "wast 262.0.0",
 ]
 
-[[package]]
-name = "webpki-roots"
-version = "1.0.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7dcd9d09a39985f5344844e66b0c530a33843579125f23e21e9f0f220850f22a"
-dependencies = [
- "rustls-pki-types",
-]
-
 [[package]]
 name = "wiggle"
 version = "49.0.3"
@@ -3415,74 +2533,12 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
-[[package]]
-name = "windows-core"
-version = "0.62.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
-dependencies = [
- "windows-implement",
- "windows-interface",
- "windows-link",
- "windows-result",
- "windows-strings",
-]
-
-[[package]]
-name = "windows-implement"
-version = "0.60.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.119",
-]
-
-[[package]]
-name = "windows-interface"
-version = "0.59.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.119",
-]
-
 [[package]]
 name = "windows-link"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
-[[package]]
-name = "windows-result"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7781fa89eaf60850ac3d2da7af8e5242a5ea78d1a11c49bf2910bb5a73853eb5"
-dependencies = [
- "windows-link",
-]
-
-[[package]]
-name = "windows-strings"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
-dependencies = [
- "windows-link",
-]
-
-[[package]]
-name = "windows-sys"
-version = "0.52.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
-dependencies = [
- "windows-targets 0.52.6",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
@@ -3723,38 +2779,6 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3ad82d2a33cdc9674dc7465672f271e096168fcdbe0f799d9e6db8c5892679dc"
 
-[[package]]
-name = "wstd"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "29b52936db10a79bb724dadd1c2c3aac958e8229dcb1f1c7f2b7044ca9fc6a3a"
-dependencies = [
- "anyhow",
- "async-task",
- "bytes",
- "futures-lite",
- "http",
- "http-body",
- "http-body-util",
- "itoa",
- "pin-project-lite",
- "serde",
- "serde_json",
- "slab",
- "wasip2",
- "wstd-macro",
-]
-
-[[package]]
-name = "wstd-macro"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "153db9b65508bf6c2efe26617169840c03671ba5719a35868db7682a5261f7d4"
-dependencies = [
- "quote",
- "syn 2.0.119",
-]
-
 [[package]]
 name = "yoke"
 version = "0.8.3"
@@ -3799,12 +2823,6 @@ dependencies = [
  "synstructure",
 ]
 
-[[package]]
-name = "zeroize"
-version = "1.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e13084392c5e4bc371903e2935a5eaeed24905a7511356b883835e18a78f6879"
-
 [[package]]
 name = "zerotrie"
 version = "0.2.5"
diff --git a/Cargo.toml b/Cargo.toml
index f8c8f48..0954500 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,11 +1,12 @@
 [workspace]
 resolver = "3"
-members = ["cli", "vfs", "interface", "sdk", "sdk/macros", "agent"]
-default-members = ["cli"]
-# Examples are standalone plugins, each with its own empty [workspace].
-exclude = ["examples"]
+members = ["host", "vfs"]
+default-members = ["host"]
+# Standalone crates with their own empty [workspace]: v2 code kept as reference
+# until the end of P1, the spikes, and the userland (its own wasm32-wasip2 workspace).
+exclude = ["cli", "interface", "sdk", "agent", "examples", "spikes", "userland"]
 
 # Wasmtime compiles components with Cranelift. Optimize dependencies in dev
-# builds, so that tests and debug runs start plugins quickly.
+# builds, so that tests and debug runs start guests quickly.
 [profile.dev.package."*"]
 opt-level = 2
diff --git a/host/Cargo.toml b/host/Cargo.toml
new file mode 100644
index 0000000..830af82
--- /dev/null
+++ b/host/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "sausage"
+version = "0.3.0"
+edition = "2024"
+description = "A world of WASI programs and durable agents."
+
+[[bin]]
+name = "sausage"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1"
+async-trait = "0.1"
+clap = { version = "4", features = ["derive"] }
+tokio = { version = "1", features = ["full"] }
+sausage-vfs = { version = "0.1.0", path = "../vfs" }
diff --git a/host/src/exec.rs b/host/src/exec.rs
new file mode 100644
index 0000000..4dad1f4
--- /dev/null
+++ b/host/src/exec.rs
@@ -0,0 +1,37 @@
+//! The contract between the harness and the process table: run a command in the world.
+//! The process table implements it; the harness's `bash` tool uses it.
+use std::time::Duration;
+
+/// What to run: a shell string (run by the world's `sh -c`) or an argv without a shell.
+#[derive(Clone, Debug)]
+pub enum Command {
+    Shell(String),
+    Argv(Vec<String>),
+}
+
+/// How to run it. `cwd` is a world path. `timeout` ends the command and all its processes.
+#[derive(Clone, Debug, Default)]
+pub struct Options {
+    pub cwd: String,
+    pub env: Vec<(String, String)>,
+    pub timeout: Option<Duration>,
+}
+
+/// The stream that one output chunk came from.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Stream {
+    Stdout,
+    Stderr,
+}
+
+/// Run commands in the world. Dropping the future kills the command and all processes it started.
+#[async_trait::async_trait]
+pub trait Exec: Send + Sync {
+    /// Run to completion and return the exit status. `output` gets each chunk as it arrives, in order.
+    async fn exec(
+        &self,
+        command: Command,
+        options: Options,
+        output: &mut (dyn FnMut(Stream, &[u8]) + Send),
+    ) -> anyhow::Result<i32>;
+}
diff --git a/host/src/harness/mod.rs b/host/src/harness/mod.rs
new file mode 100644
index 0000000..0e0d05c
--- /dev/null
+++ b/host/src/harness/mod.rs
@@ -0,0 +1,8 @@
+//! The durable agent harness: V8 with pi-durable, harness storage, and the tools' environment.
+//! Owned by task T9.
+use std::path::Path;
+
+/// Start the world at `world` with the harness and a console.
+pub async fn run(_world: &Path) -> anyhow::Result<()> {
+    anyhow::bail!("the harness does not exist yet (T9)")
+}
diff --git a/host/src/lib.rs b/host/src/lib.rs
new file mode 100644
index 0000000..1f1056f
--- /dev/null
+++ b/host/src/lib.rs
@@ -0,0 +1,7 @@
+//! The Sausage v3 host: a world folder behind a virtual filesystem, WASI programs in a process table,
+//! and the durable agent harness. See `~/research/sausage-v3/PLAN.md` until the docs move here.
+
+pub mod exec;
+pub mod harness;
+pub mod process;
+pub mod world;
diff --git a/host/src/main.rs b/host/src/main.rs
new file mode 100644
index 0000000..5c15a42
--- /dev/null
+++ b/host/src/main.rs
@@ -0,0 +1,33 @@
+//! The `sausage` binary: subcommands only, each delegates to its module.
+use clap::{Parser, Subcommand};
+use std::path::PathBuf;
+
+#[derive(Parser)]
+#[command(version, about)]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    /// Start a world: the harness, its services and a console.
+    Run { world: PathBuf },
+    /// Run a shell in a world. With `-c`, run one command and exit with its status.
+    Sh {
+        world: PathBuf,
+        #[arg(short = 'c')]
+        command: Option<String>,
+    },
+}
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    match Cli::parse().command {
+        Command::Run { world } => sausage::harness::run(&world).await,
+        Command::Sh { world, command } => {
+            let status = sausage::process::sh(&world, command).await?;
+            std::process::exit(status);
+        }
+    }
+}
diff --git a/host/src/process/mod.rs b/host/src/process/mod.rs
new file mode 100644
index 0000000..d3854d7
--- /dev/null
+++ b/host/src/process/mod.rs
@@ -0,0 +1,8 @@
+//! The process table: WASI programs in their own stores, the process interface (spawn, wait, kill),
+//! `/proc`, and the `Exec` implementation. Owned by task T8.
+use std::path::Path;
+
+/// Run a shell in the world at `world`, or one command with `command`. Returns the exit status.
+pub async fn sh(_world: &Path, _command: Option<String>) -> anyhow::Result<i32> {
+    anyhow::bail!("the process table does not exist yet (T8)")
+}
diff --git a/host/src/world.rs b/host/src/world.rs
new file mode 100644
index 0000000..929cdbf
--- /dev/null
+++ b/host/src/world.rs
@@ -0,0 +1,18 @@
+//! A world folder and the one virtual root that host code and guests share.
+use sausage_vfs::{Host, Layer, Mounts, Process};
+use std::{path::Path, sync::Arc};
+
+/// An open world. `root` is the filesystem every guest sees as `/`; host code (the harness's file
+/// tools) reads and writes through the same layer, so both always see the same files.
+pub struct World {
+    pub root: Arc<dyn Layer>,
+}
+
+impl World {
+    /// Open the world folder at `path`. The process table adds more mounts (`/proc`, `/run`).
+    pub fn open(path: &Path) -> anyhow::Result<Self> {
+        let mut mounts = Mounts::default();
+        mounts.mount("/", Arc::new(Host::new(path, Process::default())?), false);
+        Ok(World { root: Arc::new(mounts) })
+    }
+}
diff --git a/userland/.cargo/config.toml b/userland/.cargo/config.toml
new file mode 100644
index 0000000..f68f33c
--- /dev/null
+++ b/userland/.cargo/config.toml
@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-wasip2"
diff --git a/userland/Cargo.toml b/userland/Cargo.toml
new file mode 100644
index 0000000..7a39f6b
--- /dev/null
+++ b/userland/Cargo.toml
@@ -0,0 +1,7 @@
+# The default CLIs of a world, built for wasm32-wasip2. Its own workspace, outside the host's.
+[workspace]
+resolver = "3"
+members = []
+
+[profile.release]
+opt-level = 3