diff --git a/docs/development/agent-workflow.md b/docs/development/agent-workflow.md
index 77dcf800a..1e1e413ba 100644
--- a/docs/development/agent-workflow.md
+++ b/docs/development/agent-workflow.md
@@ -72,7 +72,8 @@ are recognized as package/alias mentions. Traversal and document-file imports ar
 rejected before those exemptions, including document paths with fragments or queries.
 All recognized Markdown extensions share the document-import guard; reStructuredText
 and AsciiDoc, PDF, Word, OpenDocument, RTF, Org and TeX documents are also excluded
-from package exemptions. URL-encoded
+from package exemptions. Recognized extensionless guidance names (including AGENTS,
+CLAUDE, INSTRUCTIONS and README) are excluded in package subpaths too. URL-encoded
 paths do not receive package exemptions. TypeScript configuration is parsed as JSONC.
 Declared packages also permit safe subpaths; exact aliases stay exact.
 Declared package mentions may include a version (including semver comparators and wildcard ranges) or dist-tag qualifier.
diff --git a/tools/skills/validate-agent-guidance.mjs b/tools/skills/validate-agent-guidance.mjs
index 92eb20abe..1ba82093a 100644
--- a/tools/skills/validate-agent-guidance.mjs
+++ b/tools/skills/validate-agent-guidance.mjs
@@ -130,7 +130,10 @@ async function packageMentions(rootDir) {
         if (
             /%[\da-f]{2}/iu.test(token) ||
             MARKDOWN_EXTENSION.test(path) ||
-            /\.(?:txt|json|ya?ml|html?|rst|rest|adoc|asciidoc|pdf|docx?|odt|rtf|org|tex)$/iu.test(
+            /(?:^|\/)(?:AGENTS|CLAUDE|INSTRUCTIONS|README|LICENSE|LICENCE|NOTICE|COPYING|AUTHORS|CONTRIBUTORS|CHANGELOG)$/u.test(
+                path
+            ) ||
+            /\.(?:txt|json|ya?ml|html?|rst|rest|adoc|asciidoc|pdf|doc[xm]?|dot[xm]?|od[tspgfbm]|ot[tspg]|fod[tspg]|rtf|org|tex|latex)$/iu.test(
                 path
             )
         )
diff --git a/tools/skills/validate-agent-guidance.test.mjs b/tools/skills/validate-agent-guidance.test.mjs
index ddce49e73..941b6df24 100644
--- a/tools/skills/validate-agent-guidance.test.mjs
+++ b/tools/skills/validate-agent-guidance.test.mjs
@@ -1292,3 +1292,30 @@ for (const html of [
         assert.deepEqual(await diagnostics(t, { 'AGENTS.md': html }), []);
     });
 }
+
+for (const name of [
+    'guide.ods',
+    'guide.odp',
+    'guide.docm',
+    'guide.dotx',
+    'guide.latex',
+    'AGENTS',
+    'CLAUDE',
+    'README',
+    'INSTRUCTIONS',
+    'LICENSE',
+]) {
+    test(`package subpath cannot import guidance document ${name}`, async (t) => {
+        assert.ok(
+            (
+                await diagnostics(t, {
+                    'package.json': JSON.stringify({
+                        dependencies: { '@angular/core': '*' },
+                    }),
+                    'CLAUDE.md':
+                        '@AGENTS.md\n\nRead @angular/core/docs/' + name,
+                })
+            ).some((message) => message.includes('additional or inline'))
+        );
+    });
+}