fix(cli): stop skills update deleting skills the manifest never covered (#3118)

`hyperframes skills update` deleted skills that the same command had just
installed, from every agent directory on the machine, and reported them as
"no longer published".

`skills add --skill '*'` installs every skill in the repo — including the
repo-native ones under `.claude/skills/` and `.agents/skills/` — and the
upstream lock attributes all of them to `heygen-com/hyperframes`. The published
manifest is generated from `<repoRoot>/skills` only (gen-skills-manifest.ts), so
it never lists those. detectRemoved read that silence as "removed upstream" and
pruned them, so `check || update` could not converge: `add` reinstalled them and
the next `update` deleted them again.

Scope removed-detection to skills the manifest is actually authoritative for,
using the lock's `skillPath` — the only field that separates a skill installed
from `skills/` from one installed out of the same repo's other skill roots
(`source` is identical for both). An entry with no `skillPath` is treated as not
covered: this is a delete path, so unknown provenance fails safe.

Also resolve the prune's manifest canonically. Its notion of "still published"
could otherwise come from any `skills-manifest.json` within 16 parent
directories of cwd, which — since HyperFrames' own manifest declares
`source: heygen-com/hyperframes` — matches lock attribution and drives deletion.
The install-side check already did this (#2176); the deleting path did not, and
the comment claiming that was deliberate and "tested separately" had no such
test. An explicit `--source` still wins.

Verified end to end against the real CLI in a sandboxed HOME. Before: `add`
installed 25 skills, `update` printed "Removing 6 skill(s) no longer published:
captions-overlay, changelog-video, cut-the-curve, motion-doctrine,
oversized-cursor, seam-craft" and deleted all six (27 dirs -> 21). After: no
removal line, 27 -> 27. Both new regression tests fail on the pre-fix source.

Fixes #3111

packages/cli/src/utils/skillsManifest.test.ts

@@ -495,8 +495,27 @@ describe("checkSkills removed-upstream detection", () => {
     writeFileSync(manifestPath, JSON.stringify(manifest));
     return { home, opts: { source: manifestPath, cwd: project, home } };
   }
-  function writeGlobalLock(home: string, skills: Record<string, { source: string }>): void {
-    writeFileSync(join(home, ".agents/.skill-lock.json"), JSON.stringify({ version: 3, skills }));
+  // Upstream writes a `skillPath` on every lock entry it creates (verified
+  // against a real ~/.agents/.skill-lock.json written by skills@1.5.22), and
+  // removed-detection now reads it to tell manifest-covered skills apart from
+  // ones installed out of the repo's other skill roots — see
+  // manifestCoversSkill / GH #3111. Default to the covered root so each existing
+  // fixture keeps meaning "a normally published skill"; pass skillPath
+  // explicitly to model anything else.
+  function writeGlobalLock(
+    home: string,
+    skills: Record<string, { source: string; skillPath?: string }>,
+  ): void {
+    const withPaths = Object.fromEntries(
+      Object.entries(skills).map(([name, entry]) => [
+        name,
+        { skillPath: `skills/${name}/SKILL.md`, ...entry },
+      ]),
+    );
+    writeFileSync(
+      join(home, ".agents/.skill-lock.json"),
+      JSON.stringify({ version: 3, skills: withPaths }),
+    );
   }
 
   it("flags a lock-attributed skill the manifest dropped, ignoring other sources", async () => {
@@ -514,6 +533,70 @@ describe("checkSkills removed-upstream detection", () => {
     expect(res.summary.removed).toBe(1);
   });
 
+  // GH #3111 — the data-loss regression. `skills add --skill '*'` installs every
+  // skill in the repo, including the repo-native ones under `.claude/skills/`
+  // and `.agents/skills/`, and attributes them all to our source. The published
+  // manifest is generated from `<repoRoot>/skills` ONLY (gen-skills-manifest.ts),
+  // so it never lists them — and reading that silence as "no longer published"
+  // deleted them from every agent directory on the machine, immediately after
+  // the same command installed them.
+  //
+  // Reproduced end-to-end pre-fix against the real CLI: `skills add` installed
+  // 25 skills, then `skills update` printed "Removing 6 skill(s) no longer
+  // published: captions-overlay, changelog-video, cut-the-curve, motion-doctrine,
+  // oversized-cursor, seam-craft" and deleted all six. Their lock entries carried
+  // `.agents/skills/<name>/SKILL.md`; the survivors carried `skills/<name>/…`.
+  it("never prunes a skill installed outside the manifest's coverage root", async () => {
+    const { home, opts } = setup({ source: "test", skills: { alpha: { hash: "x", files: 1 } } });
+    writeGlobalLock(home, {
+      alpha: { source: "test" }, // published, in the manifest → untouched
+      gamma: {
+        source: "test", // ours, absent from the manifest…
+        skillPath: ".agents/skills/gamma/SKILL.md", // …but the manifest never covered it
+      },
+    });
+
+    const res = await checkSkills(opts);
+
+    const byName = Object.fromEntries(res.skills.map((s) => [s.name, s.status]));
+    expect(byName.gamma).not.toBe("removed");
+    expect(res.summary.removed).toBe(0);
+  });
+
+  // The other half of the contract: the coverage filter must not blunt the
+  // retired-skill convergence #2176 added. A skill installed FROM `skills/` and
+  // since dropped from the manifest is still a real removal.
+  it("still prunes a manifest-covered skill that was genuinely dropped upstream", async () => {
+    const { home, opts } = setup({ source: "test", skills: { alpha: { hash: "x", files: 1 } } });
+    writeGlobalLock(home, {
+      alpha: { source: "test" },
+      gamma: { source: "test", skillPath: "skills/gamma/SKILL.md" },
+    });
+
+    const res = await checkSkills(opts);
+
+    expect(Object.fromEntries(res.skills.map((s) => [s.name, s.status])).gamma).toBe("removed");
+    expect(res.summary.removed).toBe(1);
+  });
+
+  // Fail safe on unknown provenance: an entry written by an older upstream that
+  // recorded no skillPath cannot be shown to be manifest-covered, and this is a
+  // DELETE path — so it is left alone rather than guessed at.
+  it("leaves an entry with no skillPath alone rather than guessing", async () => {
+    const { home, opts } = setup({ source: "test", skills: { alpha: { hash: "x", files: 1 } } });
+    writeFileSync(
+      join(home, ".agents/.skill-lock.json"),
+      JSON.stringify({
+        version: 3,
+        skills: { alpha: { source: "test" }, gamma: { source: "test" } }, // no skillPath at all
+      }),
+    );
+
+    const res = await checkSkills(opts);
+
+    expect(res.summary.removed).toBe(0);
+  });
+
   it("a removed skill alone makes an update available (no outdated/missing)", async () => {
     // Manifest lists only alpha, with its REAL hash → "current" (not outdated).
     const { home, opts } = setup({ source: "test", skills: {} });
@@ -591,7 +674,10 @@ describe("checkSkills removed-upstream detection", () => {
       join(project, "skills-lock.json"),
       JSON.stringify({
         version: 1,
-        skills: { alpha: { source: "test" }, gamma: { source: "test" } },
+        skills: {
+          alpha: { source: "test", skillPath: "skills/alpha/SKILL.md" },
+          gamma: { source: "test", skillPath: "skills/gamma/SKILL.md" },
+        },
       }),
     );
 
@@ -618,7 +704,10 @@ describe("checkSkills removed-upstream detection", () => {
       join(project, "skills-lock.json"),
       JSON.stringify({
         version: 1,
-        skills: { alpha: { source: "test" }, gamma: { source: "test" } },
+        skills: {
+          alpha: { source: "test", skillPath: "skills/alpha/SKILL.md" },
+          gamma: { source: "test", skillPath: "skills/gamma/SKILL.md" },
+        },
       }),
     );
     const home = join(root, "home2");

packages/cli/src/utils/skillsManifest.ts

@@ -429,6 +429,13 @@ export function diffSkills(
 interface LockEntry {
   source?: string;
   sourceUrl?: string;
+  /**
+   * Path of the skill's SKILL.md within the source repo, as upstream records it
+   * (`skills/general-video/SKILL.md`, `.agents/skills/seam-craft/SKILL.md`). The
+   * only field distinguishing skills the published manifest covers from ones
+   * installed out of the same repo's other skill roots — see manifestCoversSkill.
+   */
+  skillPath?: string;
 }
 
 /** The slice of the vercel-labs/skills lock file we read. */
@@ -508,7 +515,42 @@ interface RemovedResult {
   lockMissing: boolean;
 }
 
-/** Skills the lock attributes to our source that the manifest no longer ships. */
+/**
+ * The repo directory the published manifest is generated from — see
+ * `packages/cli/scripts/gen-skills-manifest.ts`, which walks `<repoRoot>/skills`
+ * and nothing else. Anything installed from a DIFFERENT root of the same repo
+ * (`.claude/skills/`, `.agents/skills/` — the repo-native contributor skills) is
+ * outside the manifest's coverage, so the manifest says nothing about it.
+ */
+const MANIFEST_COVERAGE_ROOT = "skills/";
+
+/**
+ * Is the manifest authoritative about whether this skill still exists upstream?
+ *
+ * Only for skills installed from the directory the manifest is generated from.
+ * The lock records where in the repo each skill came from (`skillPath`, e.g.
+ * `skills/general-video/SKILL.md` vs `.agents/skills/seam-craft/SKILL.md`), and
+ * both carry the same `source`, so source attribution alone cannot tell them
+ * apart. An entry with no `skillPath` (older lock format) is treated as NOT
+ * covered — for a delete, unknown provenance must fail safe. GH #3111.
+ */
+function manifestCoversSkill(entry: LockEntry | undefined): boolean {
+  const path = entry?.skillPath;
+  return typeof path === "string" && path.startsWith(MANIFEST_COVERAGE_ROOT);
+}
+
+/**
+ * Skills the lock attributes to our source that the manifest no longer ships.
+ *
+ * "Absent from the manifest" only means "removed upstream" for skills the
+ * manifest actually covers. `skills add --skill '*'` installs every skill in the
+ * repo — including the repo-native ones under `.claude/skills/` and
+ * `.agents/skills/`, which the published manifest deliberately omits — and
+ * attributes them all to our source. Without the coverage filter, every install
+ * is immediately followed by a prune that deletes those skills as "no longer
+ * published", so `check || update` never converges: `add` reinstalls them and
+ * the next `update` deletes them again, forever. GH #3111.
+ */
 function detectRemoved(
   root: SkillRoot,
   latest: SkillsManifest,
@@ -516,6 +558,7 @@ function detectRemoved(
 ): RemovedResult {
   const lock = readSkillLock(lockPathForScope(root.scope, opts));
   const removed = skillsAttributedToSource(lock, latest.source)
+    .filter((name) => manifestCoversSkill(lock?.skills?.[name]))
     .filter((name) => !(name in latest.skills))
     .sort()
     .map((name) => ({ name, status: "removed" as const }));