diff --git a/docs/backlog/P2/B-0106-tsc-noemit-gate-job-for-ts-tools-2026-04-30.md b/docs/backlog/P2/B-0106-tsc-noemit-gate-job-for-ts-tools-2026-04-30.md
new file mode 100644
index 000000000..126b4334b
--- /dev/null
+++ b/docs/backlog/P2/B-0106-tsc-noemit-gate-job-for-ts-tools-2026-04-30.md
@@ -0,0 +1,72 @@
+---
+id: B-0106
+priority: P2
+status: open
+title: Add `tsc --noEmit` gate job for tools/**.ts so type errors fail CI
+tier: factory-hygiene
+effort: S
+ask: Aaron 2026-04-29 (B-0086 trajectory) — found via slice-9 #882 post-merge audit on 2026-04-30
+created: 2026-04-30
+last_updated: 2026-04-30
+composes_with: [B-0086]
+tags: [ci-lint, factory-hygiene, ts-bun-migration, mechanical-guard, missing-gate]
+---
+
+# `tsc --noEmit` gate job for tools/**.ts
+
+A real strict-typecheck error
+(`tools/hygiene/audit-agencysignature-main-tip.ts(124,5): TS2322`)
+shipped to main in slice-9 (PR #882) and was discovered post-merge
+during slice-11 audit work on 2026-04-30. CI did not catch it because
+`gate.yml` runs `dotnet build` for F#/C# but no `tsc --noEmit` for
+TypeScript scripts under `tools/**`.
+
+The fix for the specific bug shipped as PR #887. This row tracks
+the *gap* — the missing CI gate.
+
+## Scope
+
+Add a `lint (tsc tools)` job to `.github/workflows/gate.yml` that:
+
+1. Runs `./tools/setup/install.sh` (three-way-parity, GOVERNANCE §24).
+2. Runs `bun install --frozen-lockfile` to materialize `node_modules`
+   for `typescript@6.0.3` (already in `package.json` devDeps).
+3. Runs `bun --bun tsc --noEmit -p tsconfig.json`.
+4. Caches install.sh outputs the same way `lint-shell` /
+   `lint-markdown` do.
+5. Pinned to `ubuntu-24.04`, timeout 5 minutes.
+
+## Why this matters
+
+ESLint with typed-linting catches *most* TypeScript issues but not
+all assignability narrowings — the slice-9 example was a
+`Type 'string' is not assignable to type '"head" | "commit" | "max" | "since"'`
+error that survived eslint strictTypeChecked + sonarjs but failed
+plain `tsc --noEmit`.
+
+Per the B-0086 (TS+Bun migration) trajectory, the script surface
+under `tools/` is growing — 32 ported files as of slice-11 + more
+to come. Without a CI tsc gate, this class of error will recur
+silently.
+
+## Composes with
+
+- **B-0086** — TS+Bun migration trajectory; the more we port, the
+  more important this gate becomes.
+- **The "lint (semgrep)" pattern** — semgrep was added in round 30
+  for the same reason: 14 codified rules but 0 gated builds. Same
+  shape applies here: typecheck is codified (tsconfig.json strict),
+  but the gate is missing.
+
+## Acceptance criteria
+
+- New job appears in `gate.yml` and is required for PR merge.
+- A test-PR injecting a deliberate TS2322 fails the new job.
+- A test-PR with all TS files clean passes the new job.
+- Job runtime under 3 minutes (modulo install.sh cache hit).
+
+## Effort
+
+**S (small)** — ~30 lines of YAML modeled after `lint-shell` /
+`lint-markdown`. Toolchain already pinned. No new external action
+to SHA-pin.