diff --git a/.changeset/tasks-brief-names-the-lookup-factory.md b/.changeset/tasks-brief-names-the-lookup-factory.md
new file mode 100644
index 000000000..2f39291f8
--- /dev/null
+++ b/.changeset/tasks-brief-names-the-lookup-factory.md
@@ -0,0 +1,45 @@
+---
+---
+
+Agent-facing documentation only — this PR releases nothing to HotCRM users, so the
+frontmatter above is deliberately empty (the sanctioned "releases nothing" declaration
+that `.github/workflows/changeset-check.yml` documents, on par with the `skip-changeset`
+label). The package is `private: true` with no `files[]`, and the only changed line lives
+in `.github/tasks/autonomous_feature_dev.md`. Nothing under `src/` moves: no object,
+field, view, dataset or exported symbol changed.
+
+`.github/tasks/autonomous_feature_dev.md` — the copy-paste brief that puts an agent in the
+Autonomous Development role — closed with a self-correction bullet telling it to "Ensure
+all foreign keys (`reference_to`) point to valid objects defined in Phase 2". `FieldSchema`
+has no `reference_to` key. Measured against the pinned `@objectstack/spec` 17.3.0, the
+engine answers:
+
+    Unrecognized key(s) on this field: `reference_to`. Did you mean `reference_to`
+    -> `reference`? Until this shape was closed these were dropped silently — the
+    field was still created, minus whatever the key was meant to constrain, protect
+    or compute.
+
+That tail is why this outlived a spelling fix: an author following the brief got a field
+that was created but silently stripped of the constraint they wrote. The brief is also the
+worst place for it to survive, because it is handed to an agent as a whole prompt and its
+`architect.md` role file names no field factory at all.
+
+This was the **fourth and last** site in the repo teaching that key. PR #1809 corrected the
+other three — `AGENTS.md` at `:62`, `:141`, `:348` and `.github/instructions/metadata.md` —
+and recorded this one as deliberately unfixed there, being outside that card's file surface.
+Both changesets ship in the same release; this one closes the set.
+
+The replacement mirrors the wording that landed rather than coining a third phrasing for one
+rule. "lookup / master-detail targets" and "name real objects" are `AGENTS.md`'s own Phase-3
+self-correction checklist entry; the factory parenthetical `Field.lookup(...)` /
+`Field.masterDetail(...)` is the spelling `AGENTS.md` uses at both of its constraint sites.
+The brief's own "defined in Phase 2" anchor is kept, so the bullet still points at the phase
+that authored the objects.
+
+Measured at this commit, each zero paired with a control that must hit:
+`reference_to` now has **0** matches under `.github/` (control: `Field.lookup` returns 2
+there, so the pathspec is live), and **0** teaching sites repo-wide. The 10 remaining
+matches are all non-teaching and deliberately untouched: 3 in PR #1809's own changeset
+(release-notes history), 2 under `docs/archive/2026-02/` (an archived direction), and 5
+lines across 4 `test/*.ts` files that read the key as a tolerant alias — epic #1579's
+territory.
diff --git a/.github/tasks/autonomous_feature_dev.md b/.github/tasks/autonomous_feature_dev.md
index 24b479d2a..5b90ffe83 100644
--- a/.github/tasks/autonomous_feature_dev.md
+++ b/.github/tasks/autonomous_feature_dev.md
@@ -17,7 +17,7 @@ Here is a prompt you can copy-paste to GitHub Copilot to trigger the **Autonomou
 4.  **Implementation Phase**: Once approved, generate the Logic (`.hook.ts`), Automation (`.workflow.ts`), and UI (`.page.ts`) files.
 
 **Self-Correction**:
-- Ensure all foreign keys (`reference_to`) point to valid objects defined in Phase 2.
+- Ensure all lookup / master-detail targets (`Field.lookup(...)` / `Field.masterDetail(...)`) name real objects defined in Phase 2.
 - Ensure all ObjectQL queries in Phase 4 match the fields defined in Phase 2.
 
 Start by analyzing the requirements and presenting the **Architecture Plan**.