diff --git a/.changeset/2115-plan-phase-ai-keyword-precision.md b/.changeset/2115-plan-phase-ai-keyword-precision.md
new file mode 100644
index 000000000..6fa6827dd
--- /dev/null
+++ b/.changeset/2115-plan-phase-ai-keyword-precision.md
@@ -0,0 +1,6 @@
+---
+type: Changed
+pr: 3431
+---
+<!-- docs-exempt: internal prompt-precision change to the plan-phase workflow's AI-keyword gate; no docs surface documents the keyword list or the gate's trigger keywords (re-verified on next @ 7976b1ca0 — no docs/ file mentions the list's distinctive tokens) -->
+**The `plan-phase` AI-integration capability gate no longer lists substring-collidable keywords** — bare `eval` (a substring of ordinary phase-goal words like `evaluation` and `retrieval`) is replaced by `llm eval`, and the under-specified `ai system` is dropped, per maintainer triage on the linked issue. The gate is a capability prompt, not a hard block, so this is a precision improvement: phase goals like "add evaluation metrics" or "build the retrieval layer" no longer invite a spurious AI-SPEC branch, and genuinely AI-flavored goals still match on the precise framework and technique names. (#2115)
diff --git a/gsd-core/workflows/plan-phase.md b/gsd-core/workflows/plan-phase.md
index 58bd1f947..8a2a2daf3 100644
--- a/gsd-core/workflows/plan-phase.md
+++ b/gsd-core/workflows/plan-phase.md
@@ -461,7 +461,7 @@ Read the `activeHooks` array directly from `PLAN_PRE_HOOKS_JSON` / `HOOKS_JSON`
 - If `ref.agent` is set, dispatch with `Agent(prompt=filled_hook_fragment, subagent_type=ref.agent, model="{researcher_model}")`. Use the hook's `fragment.inline` as the prompt body and fill phase fields before spawning.
 - The `research` hook is handled by §5.1's research decision. The `pattern-mapper` hook is handled by §7.8 after `RESEARCH_PATH` is known. Future plan:pre agent hooks use the same `ref.agent` fragment contract.
 
-**AI integration capability:** If the active `ai-integration` step hook is present, `AI_SPEC_PATH` is empty, and the phase goal contains AI keywords (`agent`, `llm`, `rag`, `chatbot`, `embedding`, `langchain`, `llamaindex`, `crewai`, `langgraph`, `openai`, `anthropic`, `vector`, `eval`, `ai system`), then:
+**AI integration capability:** If the active `ai-integration` step hook is present, `AI_SPEC_PATH` is empty, and the phase goal contains AI keywords (`agent`, `llm`, `rag`, `chatbot`, `embedding`, `langchain`, `llamaindex`, `crewai`, `langgraph`, `openai`, `anthropic`, `vector`, `llm eval`), then:
 - In pipeline / `--auto` mode, invoke the hook's `ref.skill` via `Skill(skill="gsd-${ref.skill}", args="${PHASE} --auto ${GSD_WS}")`.
 - In manual mode, display the existing non-blocking `/gsd:ai-integration-phase {N}` recommendation and let the user continue planning without AI-SPEC or stop to run the capability workflow first.