diff --git a/packages/dsh-plugin-browserskill/scripts/build-skill-content.mjs b/packages/dsh-plugin-browserskill/scripts/build-skill-content.mjs
index 8348fba..47042f4 100644
--- a/packages/dsh-plugin-browserskill/scripts/build-skill-content.mjs
+++ b/packages/dsh-plugin-browserskill/scripts/build-skill-content.mjs
@@ -1,8 +1,8 @@
-// Assemble the plugin's skill content: the dsh-specific prelude (committed in
-// this package at skill/prelude.md) followed VERBATIM by the canonical CLI
-// skill body (repo-root skill/SKILL.md — the same source crates/bsk-cli's
-// build.rs mirrors, so the two can never drift apart). The original's YAML
-// frontmatter is stripped: name/description are supplied by the registration.
+// Assemble the plugin's skill content: a dsh-specific routing prelude, the
+// canonical CLI skill body verbatim (repo-root skill/SKILL.md — the same source
+// crates/bsk-cli's build.rs mirrors), then a dsh routing reminder postlude. The
+// original's YAML frontmatter is stripped: name/description are supplied by the
+// registration.
 // Output: src/skill-content.generated.ts (gitignored, built before tsdown and
 // before vitest) so the markdown ships inlined in the bundle and registration
 // is a pure in-memory read — never a per-step disk access.
@@ -14,6 +14,7 @@ const here = dirname(fileURLToPath(import.meta.url));
 const pkg = join(here, "..");
 const prelude = readFileSync(join(pkg, "skill", "prelude.md"), "utf8");
 const upstream = readFileSync(join(pkg, "..", "..", "skill", "SKILL.md"), "utf8");
+const postlude = readFileSync(join(pkg, "skill", "postlude.md"), "utf8");
 
 function stripFrontmatter(markdown) {
   if (!markdown.startsWith("---\n")) return markdown;
@@ -23,16 +24,16 @@ function stripFrontmatter(markdown) {
 
 const NAME = "browser-skill";
 const DESCRIPTION =
-  "Browser automation against the user's logged-in Chromium through this plugin's browser_* " +
+  "Browser automation against the user's logged-in Chromium through this plugin's injected browser_* tools; never invoke bsk through bash or shell. " +
   "tools (bsk engine): visit and read pages, fill forms, click through flows, scrape data, " +
   "smoke-test UI changes. Use when a task needs a real browser; requires the bsk CLI and the " +
   "browser-skill extension connected.";
 
-const content = `${prelude.trim()}\n\n${stripFrontmatter(upstream).trim()}\n`;
+const content = `${prelude.trim()}\n\n${stripFrontmatter(upstream).trim()}\n\n${postlude.trim()}\n`;
 
 const banner =
   "// GENERATED by scripts/build-skill-content.mjs — do not edit.\n" +
-  "// Sources: skill/prelude.md (this package) + ../../../skill/SKILL.md (repo root).\n";
+  "// Sources: skill/prelude.md + ../../../skill/SKILL.md + skill/postlude.md.\n";
 
 writeFileSync(
   join(pkg, "src", "skill-content.generated.ts"),
diff --git a/packages/dsh-plugin-browserskill/skill/postlude.md b/packages/dsh-plugin-browserskill/skill/postlude.md
new file mode 100644
index 0000000..0d4d16c
--- /dev/null
+++ b/packages/dsh-plugin-browserskill/skill/postlude.md
@@ -0,0 +1,10 @@
+---
+
+## DSH routing reminder
+
+The CLI-oriented reference above describes behavior, not the execution mechanism in
+DeepSeek Harness. For every browser operation, call the injected `browser_*` model
+tool. Do not translate these examples into `bash` commands and do not execute `bsk`
+directly; the plugin invokes `bsk` internally. In particular, always begin with
+`browser_session_start`, pass its returned session id to subsequent `browser_*`
+tools, and finish with `browser_session_stop`.
diff --git a/packages/dsh-plugin-browserskill/skill/prelude.md b/packages/dsh-plugin-browserskill/skill/prelude.md
index ac1e736..5aa3a3f 100644
--- a/packages/dsh-plugin-browserskill/skill/prelude.md
+++ b/packages/dsh-plugin-browserskill/skill/prelude.md
@@ -1,9 +1,25 @@
 # browser-skill (dsh edition)
 
+## DSH tool-routing requirement (highest priority)
+
+This skill is running inside DeepSeek Harness, where the plugin has injected
+structured `browser_*` model tools. **Always call those injected `browser_*` tools
+for browser work. Never use `bash`, `shell`, `exec`, or another tool to invoke the
+`bsk` CLI directly.** The CLI command names shown below are only conceptual
+mappings for understanding the tools; they are not instructions to run commands.
+If a `browser_*` tool is available, using the CLI directly is incorrect because it
+bypasses plugin session ownership, observation UI, tool cards, and cleanup.
+
+Use the injected tool whose name matches the operation, for example:
+`browser_session_start`, `browser_navigate`, `browser_observe`, `browser_snapshot`,
+`browser_click`, `browser_fill`, `browser_press`, `browser_screenshot`, and
+`browser_session_stop`. Pass arguments as the tool schema specifies (not CLI flags).
+
 Drive the user's **real Chromium browser** (logins, cookies, Agent Window isolation)
-through this plugin's `browser_*` tools. Each tool spawns `bsk <cmd> --json` — the
-same engine the canonical CLI skill documents — so the workflow, judgment rules, and
-safety constraints are identical.
+through this plugin's `browser_*` tools. Each injected tool is implemented by the
+plugin using the `bsk` engine internally — the model must not invoke that engine
+itself. The workflow, judgment rules, and safety constraints remain identical to
+the canonical CLI skill.
 
 > **Tool availability**: invoking this skill (which you just did) makes the plugin's
 > `browser_*` tools available for the rest of the session — they are injected on
diff --git a/packages/dsh-plugin-browserskill/tests/skill.test.ts b/packages/dsh-plugin-browserskill/tests/skill.test.ts
index b36cab2..a3bbcf2 100644
--- a/packages/dsh-plugin-browserskill/tests/skill.test.ts
+++ b/packages/dsh-plugin-browserskill/tests/skill.test.ts
@@ -26,9 +26,14 @@ describe("registerBskSkill", () => {
     expect(skill.name).toBe("browser-skill");
     expect(typeof skill.description).toBe("string");
     expect(String(skill.description)).toContain("browser_*");
-    // body = dsh prelude + canonical CLI skill body
+    // body = dsh prelude + canonical CLI skill body + dsh postlude
     const content = String(skill.content);
     expect(content).toContain("browser_observe");
+    expect(String(skill.description)).toContain("never invoke bsk through bash or shell");
+    expect(content).toContain("Always call those injected `browser_*` tools");
+    expect(content).toContain("Never use `bash`, `shell`, `exec`");
+    expect(content).toContain("## DSH routing reminder");
+    expect(content.trimEnd()).toMatch(/always begin with[\s\S]*`browser_session_start`[\s\S]*`browser_session_stop`\.$/);
     expect(content).toContain("Owned sessions only");
     expect(content).toContain("Mandatory workflow");
     expect(content).toContain("Refs invalidate after navigation");