diff --git a/packages/compiler/src/passes/cap-check.ts b/packages/compiler/src/passes/cap-check.ts
index e1b3cbd..a6ab354 100644
--- a/packages/compiler/src/passes/cap-check.ts
+++ b/packages/compiler/src/passes/cap-check.ts
@@ -135,7 +135,7 @@ function checkDirect(src: string, allowGenerics: boolean): string {
 
 function checkDirectFn(src: string, tokens: Token[], fn: FnDecl, inner: FnDecl[]): void {
   const declared = new Set(fn.capabilities);
-  for (let i = fn.tokenStart; i < fn.tokenEnd; i++) {
+  for (let i = fn.bodyTokenStart ?? fn.tokenStart; i < fn.tokenEnd; i++) {
     if (insideAny(i, inner)) continue;
     const tok = tokens[i];
     if (!tok || tok.kind !== "ident") continue;
@@ -290,7 +290,7 @@ function scanBody(
   const callNames = new Set<string>();
   const fnNames = new Set(decls.map((d) => d.name));
 
-  for (let i = fn.tokenStart; i < fn.tokenEnd; i++) {
+  for (let i = fn.bodyTokenStart ?? fn.tokenStart; i < fn.tokenEnd; i++) {
     if (insideAny(i, inner)) continue;
     const tok = tokens[i];
     if (!tok || tok.kind !== "ident") continue;
diff --git a/packages/compiler/src/passes/intent-check.ts b/packages/compiler/src/passes/intent-check.ts
index 985d706..71d8c9d 100644
--- a/packages/compiler/src/passes/intent-check.ts
+++ b/packages/compiler/src/passes/intent-check.ts
@@ -158,7 +158,7 @@ function findFirstCapabilityUse(
     (g) => g !== fn && g.tokenStart >= fn.tokenStart && g.tokenEnd <= fn.tokenEnd,
   );
 
-  for (let i = fn.tokenStart; i < fn.tokenEnd; i++) {
+  for (let i = fn.bodyTokenStart ?? fn.tokenStart; i < fn.tokenEnd; i++) {
     if (insideAny(i, inner)) continue;
     const tok = tokens[i];
     if (!tok || tok.kind !== "ident") continue;
diff --git a/packages/compiler/tests/cap-check.test.ts b/packages/compiler/tests/cap-check.test.ts
index 34f9f1e..d246a2e 100644
--- a/packages/compiler/tests/cap-check.test.ts
+++ b/packages/compiler/tests/cap-check.test.ts
@@ -307,3 +307,28 @@ describe("static capability check (0.2)", () => {
     }
   });
 });
+
+// ---------------------------------------------------------------------------
+// Regression: stdlib namespace in parameter type annotation must not fire
+// ---------------------------------------------------------------------------
+
+describe("cap-check: no false positive for stdlib namespace in parameter type", () => {
+  it("does not fire CAP001 when stdlib namespace appears in parameter type annotation", () => {
+    // `http.Client` is a type annotation, not a capability call. Scanning from
+    // fn.tokenStart used to flag this as http.x and fire CAP001.
+    const src = "?bs 0.9\nfn handleReq(client: http.Client) -> string = \"ok\"\n";
+    expect(() => t(src)).not.toThrow();
+  });
+
+  it("does not fire CAP001 when stdlib namespace appears only in return type annotation", () => {
+    // Return type `http.Client` is a type annotation, not a capability call.
+    // No stdlib call in the body — should compile clean.
+    const src = "?bs 0.9\nfn makeClient() -> http.Client = \"placeholder\"\n";
+    expect(() => t(src)).not.toThrow();
+  });
+
+  it("still fires CAP001 when stdlib call is in the body (not the header)", () => {
+    const src = "?bs 0.9\nfn fetchData(url: string) -> string {\n  http.get(url)\n}\n";
+    expect(() => t(src)).toThrow(/CAP001/);
+  });
+});