diff --git a/docs-site/src/content/docs/guides/claude-code.md b/docs-site/src/content/docs/guides/claude-code.md
index 02d3d78875c..d3c60e845af 100644
--- a/docs-site/src/content/docs/guides/claude-code.md
+++ b/docs-site/src/content/docs/guides/claude-code.md
@@ -510,7 +510,8 @@ Anthropic passthrough is untouched.
    replaced by a stub when the lowercased JSON input contains a blocked name.
 2. **Text-block carrier:** a user text block ≥10,000 characters starting with
    `Base directory for this skill: ` — matched when the directory basename equals a blocked name
-   (case-insensitive).
+   (case-insensitive). The directory line is inspected only up to 4,096 UTF-16 code units;
+   a longer line is sent unchanged, including when it has no terminating newline.
 
 Configure with `claudeCode.blockedSkills` (default `["claude-api"]`; `[]` disables elision
 entirely). The stub keeps tool call/result pairing intact.
diff --git a/structure/clients/claude-desktop.md b/structure/clients/claude-desktop.md
index 9c21b161663..8be7c02d7d4 100644
--- a/structure/clients/claude-desktop.md
+++ b/structure/clients/claude-desktop.md
@@ -263,3 +263,6 @@ Native steering generation overrides, explicit public-API eligibility and the co
 Dashboard Fast-row persistence and client refresh follow the [Fast selector rows setting contract](../gui-and-management-api.md#fast-selector-rows-setting).
 
 The [compaction routing override](../transports/responses-failover.md#compaction-routing-overrides) is scoped to Codex Responses metadata and original Responses ingress; Claude Messages replay retains its own routing.
+## Routed bundled-skill text
+
+`src/claude/inbound.ts` bounds the text-carrier skill-directory probe to 4,096 UTF-16 code units, plus one character to recognize the terminating newline. A longer first line is preserved intact instead of being scanned or stubbed; normal POSIX, Windows, mixed and UNC separators retain their basename matching. The existing 10,000-character payload threshold and `claudeCode.blockedSkills` policy remain: `claude-api` is blocked by default, and an explicit empty list disables elision. Native Anthropic passthrough and tool-call/result pairing are unchanged. `tests/claude-integration/claude-inbound.test.ts` covers the exact 4,096/4,097 boundary and a long newline-free carrier.
diff --git a/tests/claude-integration/claude-inbound.test.ts b/tests/claude-integration/claude-inbound.test.ts
index 308f06b0c80..2390d7f82d9 100644
--- a/tests/claude-integration/claude-inbound.test.ts
+++ b/tests/claude-integration/claude-inbound.test.ts
@@ -681,6 +681,34 @@ describe("bundled-skill elision for routed models (devlog 260712 060)", () => {
     const texts = userTexts(requestWithSkillTextBlock("claude-api", 20_000, undefined, oversizedDir));
     expect(texts.some(t => t.startsWith(`Base directory for this skill: ${oversizedDir}`))).toBe(true);
   });
+
+  for (const [prefix, separator] of [["/", "/"], ["C:\\", "\\"]] as const) {
+    for (const pathLength of [4_096, 4_097]) {
+      test(`text-block carrier: ${prefix} marker path at ${pathLength} characters`, () => {
+        const suffix = `${separator}claude-api${separator}`;
+        const dir = prefix + "a".repeat(pathLength - prefix.length - suffix.length) + suffix;
+        const texts = userTexts(requestWithSkillTextBlock("claude-api", 20_000, undefined, dir));
+        const bundle = `Base directory for this skill: ${dir}\n\n` + "DOCS ".repeat(4_000);
+        expect(dir.length).toBe(pathLength);
+        if (pathLength === 4_096) {
+          expect(texts.some(text => text.includes("'claude-api'") && text.includes("elided"))).toBe(true);
+          expect(texts.every(text => text.length < 10_000)).toBe(true);
+        } else {
+          expect(texts).toContain(bundle);
+        }
+      });
+    }
+  }
+
+  test("text-block carrier: an oversized first line without a newline stays byte-for-byte intact", () => {
+    const text = "Base directory for this skill: /" + "a/".repeat(10_000) + "claude-api";
+    const body = anthropicToResponsesTranslation({
+      model: "gemini/gemini-3-pro",
+      max_tokens: 100,
+      messages: [{ role: "user", content: [{ type: "text", text }] }],
+    }).body;
+    expect(userTexts(body)).toContain(text);
+  });
 });
 
 describe("ocx-route directive (devlog 072)", () => {