SocketDev
diff --git a/‎.github/workflows/ci.yml‎
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diff --git a/‎README.md‎
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diff --git a/‎crates/socket-patch-cli/CLI_CONTRACT.md‎
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diff --git a/‎crates/socket-patch-cli/src/args.rs‎
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diff --git a/‎crates/socket-patch-cli/src/commands/repair_vendor.rs‎
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diff --git a/‎crates/socket-patch-cli/src/commands/scan.rs‎
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@@ -99,10 +99,15 @@ jobs:
         # validates the output with vexctl when it's on PATH. vexctl is
         # a Go binary distributed via `go install`. Setting up Go here
         # is the cheapest way to give every test job a usable vexctl.
+        # Go must be >= 1.24: its linker only began emitting an LC_UUID load
+        # command then, and the macOS-latest runner's dyld (Sequoia+) refuses
+        # to load a Mach-O binary without one ("missing LC_UUID load command"),
+        # so a 1.22-built vexctl crashes on launch and every e2e_vex assertion
+        # fails. ubuntu/windows are unaffected, but the matrix shares this pin.
         # SHA pin resolved from `gh api repos/actions/setup-go/git/refs/tags/v6.4.0`.
         uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
         with:
-          go-version: '1.22'
+          go-version: '1.24'
           cache: false
 
       - name: Install vexctl
 
@@ -115,6 +115,9 @@ Each flag has a matching `SOCKET_*` environment variable. **Precedence is CLI ar
 | `--proxy-url <url>` | `SOCKET_PROXY_URL` | Public proxy URL used when no API token is set. |
 | `-e, --ecosystems <list>` | `SOCKET_ECOSYSTEMS` | Restrict to specific ecosystems (comma-separated, e.g. `npm,pypi`). |
 | `--download-mode <mode>` | `SOCKET_DOWNLOAD_MODE` | Artifact to fetch when local files are missing: `diff` (default, smallest delta), `package` (full per-package tarball), or `file` (legacy per-file blobs). |
+| `--vendor-source <mode>` | `SOCKET_VENDOR_SOURCE` | How `vendor` acquires the installable artifact: `auto` (default — download the prebuilt package from patch.socket.dev, fall back to a local build on any miss), `service` (require the service, fail-closed), or `build` (always build locally). Covers npm, pypi, cargo, golang, composer, and gem. |
+| `--vendor-url <url>` | `SOCKET_VENDOR_URL` | Base host for the vendoring service's package-reference request (default: the active `--api-url`/`--proxy-url` base). Point at staging / local dev for testing. |
+| `--patch-server-url <url>` | `SOCKET_PATCH_SERVER_URL` | Override the host of the prebuilt-archive download URL the service returns (default: as returned). Mainly for local-dev / testing. |
 | `--offline` | `SOCKET_OFFLINE` | Strict airgap: never contact the network. Operations that need remote data fail loudly. |
 | `-g, --global` | `SOCKET_GLOBAL` | Operate on globally-installed packages. |
 | `--global-prefix <path>` | `SOCKET_GLOBAL_PREFIX` | Override the path used to discover globally-installed packages. |
 
@@ -35,6 +35,9 @@ In v3.0 every subcommand accepts the same set of "global" flags via a single sha
 | `--proxy-url` | — | `SOCKET_PROXY_URL` | `https://patches-api.socket.dev` | string | Public proxy when no token |
 | `--ecosystems` | `-e` | `SOCKET_ECOSYSTEMS` | (all) | CSV → `Vec<String>` | Restrict to these ecosystems |
 | `--download-mode` | — | `SOCKET_DOWNLOAD_MODE` | **`diff`** | enum: `diff` \| `package` \| `file` | Patch artifact format |
+| `--vendor-source` | — | `SOCKET_VENDOR_SOURCE` | **`auto`** | enum: `auto` \| `service` \| `build` | How `vendor` acquires the installable artifact (see "Prebuilt vendor artifacts") |
+| `--vendor-url` | — | `SOCKET_VENDOR_URL` | (active API/proxy base) | string | Base host for the vendoring-service package-reference request |
+| `--patch-server-url` | — | `SOCKET_PATCH_SERVER_URL` | (server-returned) | string | Override the host of the prebuilt-archive download URL (local-dev / testing) |
 | `--offline` | — | `SOCKET_OFFLINE` | `false` | bool | **Strict airgap on every command** — never contact the network |
 | `--global` | `-g` | `SOCKET_GLOBAL` | `false` | bool | Operate on globally-installed packages |
 | `--global-prefix` | — | `SOCKET_GLOBAL_PREFIX` | (auto) | path | Override global packages root |
@@ -326,6 +329,46 @@ machines with **no socket-patch installed and no Socket API access** (registry a
 unvendored dependencies may still be needed). Every mechanism below was validated against the real
 package managers (`spikes/PHASE0-FINDINGS.txt`).
 
+**Prebuilt vendor artifacts (`--vendor-source`)**: by default (`auto`) `vendor` first tries to
+DOWNLOAD the already-built patched artifact + integrity from the patch.socket.dev vendoring service,
+and silently falls back to building it locally on any non-fatal miss. `service` requires the service
+(fail-closed); `build` always builds locally (the pre-service behavior). The download is a two-step
+flow on the configured API/proxy host (`--vendor-url` overrides it): a package-reference POST
+(`/v0/orgs/{slug}/patches/package` authenticated, else the public proxy's `/patch/package`) yields a
+grant-tokenized serve URL + integrity, then a GET fetches the archive (`--patch-server-url` rewrites
+that URL's host for local-dev / testing). The downloaded bytes are ALWAYS integrity-verified before
+use (sha512 SRI for every ecosystem; golang additionally the `h1:` module dirhash) — a mismatch is a
+hard error, never a silent fallback. A service-vended package reports each patched file as
+`AlreadyPatched` (trust is the verified service integrity, not a local re-apply). The fallback ladder
+per service outcome:
+
+| Service outcome | `auto` | `service` |
+|---|---|---|
+| granted/reused, integrity ok | **use service** | **use service** |
+| integrity mismatch | local build + `vendor_prebuilt_integrity_mismatch` | refuse (`vendor_prebuilt_required`) |
+| still building (`pending_build` / serve 408) | local build + `vendor_prebuilt_pending` | refuse |
+| not built / withdrawn / not found / no usable artifact | local build (quiet) | refuse |
+| 401 / 403 grant / 5xx / network error | local build + `vendor_prebuilt_unavailable` | refuse |
+| `--offline` | local build | refuse (`vendor_service_offline_conflict`) |
+
+Coverage today: **npm** (all lock flavors), **pypi** (wheel — sdist falls back / refuses), **cargo**
+(download + extract the `.crate`), **golang** (download + extract the module zip, verify the `h1:`
+dirhash, wire the `replace`), **composer** (download + extract the dist zip), and **gem** (download +
+extract the `.gem`, plus a `gem-stub-gemspec` SECOND artifact). The Tier-B ecosystems
+(cargo/golang/composer/gem) download the patched archive and extract it into the vendor directory —
+the same source tree the local build commits — then run the existing path-dep wiring; their
+build-equivalence is exercised by the toolchain-backed e2e suites (which skip when the package
+manager is absent). **gem** needs the extra `gem-stub-gemspec` artifact because a path-sourced gem
+needs an eval-able stub gemspec that the `.gem` archive doesn't carry in bundler's required form (a
+`.gem` keeps the gemspec as YAML in `metadata.gz`); the converter generates that stub and serves it
+alongside the `.gem`, and the gem backend downloads + integrity-verifies both. A served gem whose
+stub is missing (a native-extension gem, for which the converter emits no stub, or a patch built
+before the stub rollout) is treated as a service miss — `auto` falls back to the local build,
+`service` refuses (`vendor_prebuilt_required`). For any ecosystem with no service path at all
+`auto`/`build` build locally as before, and `service` refuses with
+`vendor_service_unsupported_ecosystem`. A successful service vend emits `vendor_prebuilt_downloaded`.
+Unrelated to `--download-mode` (which selects the patch-CONTENT format for the local build).
+
 **Patch sources stay in memory (v3.4)**: vendoring never writes `.socket/blobs/`, `.socket/diffs/`,
 or temporary patch files. Pre-existing `.socket/` artifacts (from a prior `apply`/`get`/`repair`)
 are read in place; already-vendored purls re-stage patch content from the committed artifact itself
@@ -523,6 +566,9 @@ All v3.0 env vars use the `SOCKET_*` prefix. Three legacy `SOCKET_PATCH_*` names
 | `SOCKET_PROXY_URL` | `--proxy-url` | `https://patches-api.socket.dev` | **Renamed in v3.0** (was `SOCKET_PATCH_PROXY_URL`). |
 | `SOCKET_ECOSYSTEMS` | `--ecosystems` / `-e` | (all) | Comma-separated list. |
 | `SOCKET_DOWNLOAD_MODE` | `--download-mode` | `diff` | One of `diff` / `package` / `file`. |
+| `SOCKET_VENDOR_SOURCE` | `--vendor-source` | `auto` | One of `auto` / `service` / `build`. |
+| `SOCKET_VENDOR_URL` | `--vendor-url` | (active API/proxy base) | Vendoring-service package-reference host. |
+| `SOCKET_PATCH_SERVER_URL` | `--patch-server-url` | (server-returned) | Rewrites the prebuilt-archive download host. |
 | `SOCKET_OFFLINE` | `--offline` | `false` | — |
 | `SOCKET_GLOBAL` | `--global` / `-g` | `false` | — |
 | `SOCKET_GLOBAL_PREFIX` | `--global-prefix` | (auto) | — |
 
@@ -22,6 +22,7 @@ use socket_patch_core::constants::{
     DEFAULT_PATCH_API_PROXY_URL, DEFAULT_PATCH_MANIFEST_PATH, DEFAULT_SOCKET_API_URL,
 };
 use socket_patch_core::crawlers::Ecosystem;
+use socket_patch_core::patch::vendor::VendorSource;
 
 /// clap value-parser for each `--ecosystems` / `SOCKET_ECOSYSTEMS` token.
 ///
@@ -49,6 +50,16 @@ fn parse_supported_ecosystem(s: &str) -> Result<String, String> {
     }
 }
 
+/// clap value-parser for `--vendor-source` / `SOCKET_VENDOR_SOURCE`.
+///
+/// Validates the token against [`VendorSource`] (`auto` | `service` | `build`,
+/// case-insensitive) at parse time so a typo fails the command immediately
+/// rather than at vendor time, and normalizes it to the canonical lowercase
+/// tag. Mirrors [`parse_supported_ecosystem`]'s fail-loud-on-typo posture.
+fn parse_vendor_source(s: &str) -> Result<String, String> {
+    VendorSource::parse(s).map(|v| v.as_tag().to_string())
+}
+
 /// clap value-parser for boolean flags backed by an env var.
 ///
 /// Identical to clap's stock `BoolishValueParser` (case-insensitive
@@ -134,6 +145,35 @@ pub struct GlobalArgs {
     )]
     pub download_mode: String,
 
+    /// Where `vendor` acquires the installable patched artifact. `auto`
+    /// (default) downloads the prebuilt archive from the patch.socket.dev
+    /// vendoring service and silently falls back to a local build on any miss;
+    /// `service` requires the service and fails closed; `build` always builds
+    /// locally (the pre-service behavior). Only `vendor` uses this; other
+    /// subcommands accept it silently.
+    #[arg(
+        long = "vendor-source",
+        env = "SOCKET_VENDOR_SOURCE",
+        default_value = "auto",
+        value_parser = parse_vendor_source,
+    )]
+    pub vendor_source: String,
+
+    /// Base URL for the patch vendoring service's package-reference request
+    /// (the step-1 POST). Defaults to the active API base (`--api-url`) when
+    /// authenticated or the proxy base (`--proxy-url`) otherwise. Override to
+    /// point `vendor` at staging / local dev independently of `--api-url`.
+    #[arg(long = "vendor-url", env = "SOCKET_VENDOR_URL")]
+    pub vendor_url: Option<String>,
+
+    /// Override the host of the prebuilt-archive download URL the vendoring
+    /// service returns (the step-2 GET). When set, the CLI rewrites the
+    /// scheme + host (+ port) of the returned URL to this base, preserving the
+    /// path. Mainly for local-dev / testing, where the host the server bakes
+    /// into the URL is not the one to actually fetch from.
+    #[arg(long = "patch-server-url", env = "SOCKET_PATCH_SERVER_URL")]
+    pub patch_server_url: Option<String>,
+
     /// Strict airgap: never contact the network. Operations that need remote
     /// data fail loudly when this is set.
     #[arg(
@@ -330,6 +370,9 @@ pub const GLOBAL_ARG_ENV_VARS: &[&str] = &[
     "SOCKET_PROXY_URL",
     "SOCKET_ECOSYSTEMS",
     "SOCKET_DOWNLOAD_MODE",
+    "SOCKET_VENDOR_SOURCE",
+    "SOCKET_VENDOR_URL",
+    "SOCKET_PATCH_SERVER_URL",
     "SOCKET_OFFLINE",
     "SOCKET_GLOBAL",
     "SOCKET_GLOBAL_PREFIX",
@@ -390,6 +433,9 @@ impl Default for GlobalArgs {
             proxy_url: String::new(),
             ecosystems: None,
             download_mode: "diff".to_string(),
+            vendor_source: "auto".to_string(),
+            vendor_url: None,
+            patch_server_url: None,
             offline: false,
             strict: false,
             global: false,
@@ -524,6 +570,7 @@ mod tests {
             std::env::set_var("SOCKET_GLOBAL_PREFIX", "");
             std::env::set_var("SOCKET_ECOSYSTEMS", "");
             std::env::set_var("SOCKET_DOWNLOAD_MODE", "");
+            std::env::set_var("SOCKET_VENDOR_SOURCE", "");
             std::env::set_var("SOCKET_MANIFEST_PATH", "keep.json");
             std::env::set_var("SOCKET_ORG_SLUG", " ");
 
@@ -552,10 +599,95 @@ mod tests {
             assert!(cli.common.global_prefix.is_none());
             assert!(cli.common.ecosystems.is_none());
             assert_eq!(cli.common.download_mode, "diff");
+            assert_eq!(
+                cli.common.vendor_source, "auto",
+                "empty SOCKET_VENDOR_SOURCE must fall back to the `auto` default"
+            );
             assert_eq!(cli.common.manifest_path, "keep.json");
         });
     }
 
+    /// `--vendor-source` parses every known token, normalizes case, honors the
+    /// env var, and defaults to `auto`; an unknown token aborts the parse.
+    #[test]
+    #[serial_test::serial]
+    fn vendor_source_flag_parses_normalizes_and_defaults() {
+        with_clean_socket_env(|| {
+            // Default when unset.
+            let cli = TestCli::try_parse_from(["socket-patch"]).unwrap();
+            assert_eq!(cli.common.vendor_source, "auto");
+
+            // CLI value, case-normalized to the canonical tag.
+            let cli =
+                TestCli::try_parse_from(["socket-patch", "--vendor-source", "SERVICE"]).unwrap();
+            assert_eq!(cli.common.vendor_source, "service");
+
+            // Env var honored.
+            std::env::set_var("SOCKET_VENDOR_SOURCE", "build");
+            let cli = TestCli::try_parse_from(["socket-patch"]).unwrap();
+            assert_eq!(cli.common.vendor_source, "build");
+            std::env::remove_var("SOCKET_VENDOR_SOURCE");
+
+            // Garbage is rejected at parse time.
+            assert!(
+                TestCli::try_parse_from(["socket-patch", "--vendor-source", "download"]).is_err(),
+                "an unknown vendor source must fail the parse",
+            );
+        });
+    }
+
+    /// The new URL knobs flow through to the parsed args from CLI and env.
+    #[test]
+    #[serial_test::serial]
+    fn vendor_url_and_patch_server_url_flow_from_cli_and_env() {
+        with_clean_socket_env(|| {
+            let cli = TestCli::try_parse_from([
+                "socket-patch",
+                "--vendor-url",
+                "https://patch.socket-staging.dev",
+                "--patch-server-url",
+                "http://localhost:4026",
+            ])
+            .unwrap();
+            assert_eq!(
+                cli.common.vendor_url.as_deref(),
+                Some("https://patch.socket-staging.dev")
+            );
+            assert_eq!(
+                cli.common.patch_server_url.as_deref(),
+                Some("http://localhost:4026")
+            );
+
+            std::env::set_var("SOCKET_VENDOR_URL", "https://from-env.example");
+            let cli = TestCli::try_parse_from(["socket-patch"]).unwrap();
+            assert_eq!(
+                cli.common.vendor_url.as_deref(),
+                Some("https://from-env.example")
+            );
+            std::env::remove_var("SOCKET_VENDOR_URL");
+            // Unset by default.
+            let cli = TestCli::try_parse_from(["socket-patch"]).unwrap();
+            assert!(cli.common.vendor_url.is_none());
+            assert!(cli.common.patch_server_url.is_none());
+        });
+    }
+
+    /// Single-source-of-truth guard: the new env vars must be registered in
+    /// `GLOBAL_ARG_ENV_VARS` (drives the scrub + clean-env harness).
+    #[test]
+    fn global_arg_env_vars_includes_vendor_knobs() {
+        for var in [
+            "SOCKET_VENDOR_SOURCE",
+            "SOCKET_VENDOR_URL",
+            "SOCKET_PATCH_SERVER_URL",
+        ] {
+            assert!(
+                GLOBAL_ARG_ENV_VARS.contains(&var),
+                "{var} must be in GLOBAL_ARG_ENV_VARS",
+            );
+        }
+    }
+
     /// `parse_bool_flag` accepts the same vocabulary as clap's
     /// `BoolishValueParser`, case-insensitively and with surrounding whitespace
     /// trimmed.
 
@@ -602,6 +602,8 @@ pub(crate) async fn repair_vendored_artifacts(
             &vendored_at,
             false,
             false,
+            // Repair rebuilds locally from the recorded patch — no service.
+            None,
         )
         .await;
         match outcome {
 
@@ -1277,8 +1277,10 @@ fn boxed_vendor_records<'a>(
     detached: bool,
     env: &'a mut Envelope,
 ) -> std::pin::Pin<Box<dyn std::future::Future<Output = bool> + 'a>> {
+    // `scan --vendor` builds locally (no vendoring-service config); the
+    // `vendor` command is the service-download entry point.
     Box::pin(vendor_records(
-        common, records, sources, detached, false, env,
+        common, records, sources, detached, false, env, None,
     ))
 }
Original file line number	Diff line number	Diff line change
`@@ -602,6 +602,8 @@ pub(crate) async fn repair_vendored_artifacts(`
`602`	`602`	`&vendored_at,`
`603`	`603`	`false,`
`604`	`604`	`false,`
	`605`	`+ // Repair rebuilds locally from the recorded patch — no service.`
	`606`	`+ None,`
`605`	`607`	`)`
`606`	`608`	`.await;`
`607`	`609`	`match outcome {`