diff --git a/src/common/toolmeta.ts b/src/common/toolmeta.ts
index 84d23294..fb1e6e4d 100644
--- a/src/common/toolmeta.ts
+++ b/src/common/toolmeta.ts
@@ -171,9 +171,14 @@ export interface ToolMeta {
 //// shared dependency-parsing patterns (from src/ide/project.ts)
 
 // C / most assemblers: [.#%]?include|incbin|embed "file", //#resource "file"
+// The resource form is also useful to tools whose own include syntax has no
+// way to name a non-source file (e.g. urust's custom board TOML).
+export const SHARED_RESOURCE_PATTERNS: RegExp[] = [
+  /^\s*([;']|[/][/])#(resource)\s+"(.+?)"/gm,
+];
 export const SHARED_INCLUDE_PATTERNS: RegExp[] = [
   /^\s*[.#%]?(include|incbin|embed)\s+"(.+?)"/gmi,
-  /^\s*([;']|[/][/])#(resource)\s+"(.+?)"/gm,
+  ...SHARED_RESOURCE_PATTERNS,
 ];
 
 // dasm accepts include/incbin file names without quotes as well as quoted
@@ -265,6 +270,7 @@ const URUST_MOD_PATTERN = /^\s*(?:pub(?:\([^)]*\))?\s+)?mod\s+([A-Za-z_][A-Za-z0
 const URUST_RS8_MODULE_PATTERN = /\brs8::(atari8|c64|conio|io|nes|rand|vcs)\b/g;
 export const URUST_INCLUDE_PATTERNS: (RegExp | ToolIncludePattern)[] = [
   /\binclude_(?:bytes|str)!\s*\(\s*"(.+?)"\s*\)/g,
+  ...SHARED_RESOURCE_PATTERNS,
   { re: URUST_MOD_PATTERN, suffix: '.rs' },
   { re: URUST_MOD_PATTERN, suffix: '/mod.rs' },
   { re: URUST_RS8_MODULE_PATTERN, suffix: '.rs' },
diff --git a/src/common/toolselect.ts b/src/common/toolselect.ts
index 96d45458..cf8a9317 100644
--- a/src/common/toolselect.ts
+++ b/src/common/toolselect.ts
@@ -21,12 +21,12 @@ export function getToolForFilename_6502(fn: string): string {
   if (fn.endsWith(".bb")) return "bataribasic";
   if (fn.endsWith(".acme")) return "acme";
   if (fn.endsWith(".xa")) return "xa";
-  if (fn.endsWith(".rs")) return "urust";
   if (fn.endsWith(".wiz")) return "wiz";
   if (fn.endsWith(".ecs")) return "ecs";
   if (fn.endsWith(".cpp")) return "oscar64";
   if (fn.endsWith(".cc")) return "oscar64";
   if (fn.endsWith(".o64")) return "oscar64";
+  if (fn.endsWith(".rs")) return "urust";
   return "dasm"; // .a
 }
 
@@ -39,6 +39,7 @@ export function getToolForFilename_z80(fn: string): string {
   if (fn.endsWith(".scc")) return "sccz80";
   if (fn.endsWith(".z")) return "zmac";
   if (fn.endsWith(".wiz")) return "wiz";
+  if (fn.endsWith(".rs")) return "urust";
   return "zmac";
 }
 
diff --git a/src/docs/build-directives.md b/src/docs/build-directives.md
index a7185b81..7f662d40 100644
--- a/src/docs/build-directives.md
+++ b/src/docs/build-directives.md
@@ -128,6 +128,14 @@ Passes arguments straight to one tool phase, with no interpretation:
 Arguments may be quoted with single or double quotes when they contain
 spaces. This is an escape hatch that the build system cannot validate.
 
+If a flag names a file (for example urust's custom board), also list that
+file as a resource so the IDE and CLI copy it into the build filesystem:
+
+~~~rust
+//#resource "vicdual.toml"
+//#flag c --board vicdual.toml
+~~~
+
 ### `//#tooldef` — set a typed build parameter
 
 Sets a named build parameter that the build system understands:
diff --git a/src/worker/tools/urust.ts b/src/worker/tools/urust.ts
index a30aa35b..b689ecf9 100644
--- a/src/worker/tools/urust.ts
+++ b/src/worker/tools/urust.ts
@@ -26,12 +26,16 @@ export function compileUrust(step: BuildStep): BuildStepResult {
     const wasi = new WASIRunner();
     wasi.initSync(wasiModule);
     populateWASIFiles(wasi, step);
-    const args = ['urust', 'build', step.path, '--platform', platform, '--emit', 'bin', '-o', binpath,
+    let args = ['urust', 'build', step.path, '--emit', 'bin', '-o', binpath,
         '-O1', '-fno-bounds-checks',
         '-Wall',
         '--auto-mod',
         '--debug-out', dbgpath, '--error-format', 'json'];
     args.push.apply(args, extraArgsFor('urust', step.params && step.params.buildArgs));
+    // TODO: put board in toolmeta?
+    if (!args.includes('--board') && !args.includes('--platform')) {
+        args.push.apply(args, ['--platform', platform]);
+    }
     wasi.setArgs(args);
     const trapped: WorkerError[] = [];
     runWASI(wasi, trapped);
diff --git a/test/unit/testurust.ts b/test/unit/testurust.ts
index 563fb15c..7e2d380c 100644
--- a/test/unit/testurust.ts
+++ b/test/unit/testurust.ts
@@ -21,6 +21,11 @@ describe('urust tool', function () {
     assert.deepStrictEqual(deps, ['art/a.bin', 't.txt', 'x']);
   });
 
+  it('scans //#resource files as dependencies', function () {
+    const src = '//#resource "vicdual.toml"\n//#flag c --board vicdual.toml\nfn main() {}\n';
+    assert.deepStrictEqual(matchDependencyPatterns(src, getIncludePatterns('urust')), ['vicdual.toml']);
+  });
+
   it('scans mod/use as module dependencies', function () {
     const src = 'mod audio;\npub mod bcd;\n' +
       'use audio::{music_play, SND_COIN};\nuse bcd::bcd_add;\nuse rs8::reset;\n';