diff --git a/gardener/gardener-run.sh b/gardener/gardener-run.sh
index 942c86b..62e9eb1 100755
--- a/gardener/gardener-run.sh
+++ b/gardener/gardener-run.sh
@@ -114,10 +114,7 @@ You have full shell access and --dangerously-skip-permissions.
 Fix what you can. File vault items for what you cannot. Do NOT ask permission — act first, report after.
 
 ## Project context
-${CONTEXT_BLOCK}${LESSONS_INJECTION:+## Lessons learned
-${LESSONS_INJECTION}
-
-}
+${CONTEXT_BLOCK}$(formula_lessons_block)
 ${SCRATCH_CONTEXT:+${SCRATCH_CONTEXT}
 }
 ## Result file
diff --git a/lib/formula-session.sh b/lib/formula-session.sh
index 64ca724..e6c6aae 100644
--- a/lib/formula-session.sh
+++ b/lib/formula-session.sh
@@ -362,6 +362,17 @@ formula_prepare_profile_context() {
   LESSONS_INJECTION="${LESSONS_CONTEXT:-}"
 }
 
+# formula_lessons_block
+# Returns a formatted lessons block for prompt injection.
+# Usage: LESSONS_BLOCK=$(formula_lessons_block)
+# Expects: LESSONS_INJECTION to be set by formula_prepare_profile_context.
+# Returns: formatted block or empty string.
+formula_lessons_block() {
+  if [ -n "${LESSONS_INJECTION:-}" ]; then
+    printf '\n## Lessons learned (from .profile/knowledge/lessons-learned.md)\n%s' "$LESSONS_INJECTION"
+  fi
+}
+
 # profile_write_journal ISSUE_NUM ISSUE_TITLE OUTCOME [FILES_CHANGED]
 # Post-session: writes a reflection journal entry after work completes.
 # Returns 0 on success, 1 on failure.
diff --git a/planner/planner-run.sh b/planner/planner-run.sh
index f7bb8a4..663703c 100755
--- a/planner/planner-run.sh
+++ b/planner/planner-run.sh
@@ -95,10 +95,7 @@ build_sdk_prompt_footer "
 PROMPT="You are the strategic planner for ${FORGE_REPO}. Work through the formula below.
 
 ## Project context
-${CONTEXT_BLOCK}${MEMORY_BLOCK}${LESSONS_INJECTION:+## Lessons learned
-${LESSONS_INJECTION}
-
-}
+${CONTEXT_BLOCK}${MEMORY_BLOCK}$(formula_lessons_block)
 ${GRAPH_SECTION}
 ${SCRATCH_CONTEXT:+${SCRATCH_CONTEXT}
 }
diff --git a/predictor/predictor-run.sh b/predictor/predictor-run.sh
index e2e5c0e..266829c 100755
--- a/predictor/predictor-run.sh
+++ b/predictor/predictor-run.sh
@@ -91,10 +91,7 @@ Use WebSearch for external signal scanning — be targeted (project dependencies
 and tools only, not general news). Limit to 3 web searches per run.
 
 ## Project context
-${CONTEXT_BLOCK}${LESSONS_INJECTION:+## Lessons learned
-${LESSONS_INJECTION}
-
-}
+${CONTEXT_BLOCK}$(formula_lessons_block)
 ${GRAPH_SECTION}
 ${SCRATCH_CONTEXT:+${SCRATCH_CONTEXT}
 }
diff --git a/review/review-pr.sh b/review/review-pr.sh
index 036e1a8..8a9a29d 100755
--- a/review/review-pr.sh
+++ b/review/review-pr.sh
@@ -208,7 +208,7 @@ FORMULA=$(cat "${FACTORY_ROOT}/formulas/review-pr.toml")
     "$PR_BODY" "$FILES" "$DNOTE" "$DIFF"
   [ -n "$PREV_CONTEXT" ] && printf '%s\n' "$PREV_CONTEXT"
   [ -n "$GRAPH_SECTION" ] && printf '%s\n' "$GRAPH_SECTION"
-  [ -n "$LESSONS_INJECTION" ] && printf '\n## Lessons learned\n%s\n\n' "$LESSONS_INJECTION"
+  formula_lessons_block
   printf '\n## Formula\n%s\n\n## Environment\nREVIEW_OUTPUT_FILE=%s\nFORGE_API=%s\nPR_NUMBER=%s\nFACTORY_ROOT=%s\n' \
     "$FORMULA" "$OUTPUT_FILE" "$API" "$PR_NUMBER" "$FACTORY_ROOT"
   printf 'NEVER echo the actual token — always reference ${FORGE_TOKEN} or ${FORGE_REVIEW_TOKEN}.\n'
diff --git a/supervisor/supervisor-run.sh b/supervisor/supervisor-run.sh
index 67e893c..4ba6ec3 100755
--- a/supervisor/supervisor-run.sh
+++ b/supervisor/supervisor-run.sh
@@ -100,10 +100,7 @@ Fix what you can. File vault items for what you cannot. Do NOT ask permission 
 ${PREFLIGHT_OUTPUT}
 
 ## Project context
-${CONTEXT_BLOCK}${LESSONS_INJECTION:+## Lessons learned
-${LESSONS_INJECTION}
-
-}
+${CONTEXT_BLOCK}$(formula_lessons_block)
 ${SCRATCH_CONTEXT:+${SCRATCH_CONTEXT}
 }
 Priority order: P0 memory > P1 disk > P2 stopped > P3 degraded > P4 housekeeping