diff --git a/src/gaia/eval/quality_metrics.py b/src/gaia/eval/quality_metrics.py
index 4bc06372c..2bf8c9032 100644
--- a/src/gaia/eval/quality_metrics.py
+++ b/src/gaia/eval/quality_metrics.py
@@ -20,7 +20,7 @@
 **FP/FN axis.** Email triage has two independent binary axes — a spam/phishing
 axis (the corpus tracks ``is_spam`` / ``is_phishing`` booleans) and a
 "needs-attention" axis (category ∈ ``NEEDS_ATTENTION_CATEGORIES`` = {urgent,
-actionable}). #1278's bars (FP<5% / FN<2%) are coherent on the attention axis
+needs_response}). #1278's bars (FP<5% / FN<2%) are coherent on the attention axis
 (missing an important mail is worse than a false alarm), so the gate defaults to
 it — but the axis is a *manifest* value, so flipping the gate to the spam axis is
 a data edit. This module still exposes neutral primitives for *all* axes. Ground
@@ -50,7 +50,7 @@
 # Default attention axis: which categories count as "needs attention" (the axis
 # #1278's FP/FN bars are coherent on). Missing one of these is worse than a false
 # alarm — the asymmetry the bars encode.
-NEEDS_ATTENTION_CATEGORIES = {"urgent", "actionable"}
+NEEDS_ATTENTION_CATEGORIES = {"urgent", "needs_response"}
 
 
 @dataclass
@@ -184,7 +184,7 @@ def confusion_for_categories(
     positive_categories: set[str],
 ) -> Confusion:
     """One-vs-rest confusion treating ``positive_categories`` as the positive
-    class (e.g. ``{"urgent", "actionable"}`` for a needs-attention axis)."""
+    class (e.g. ``{"urgent", "needs_response"}`` for a needs-attention axis)."""
     positives = {c.strip().lower() for c in positive_categories}
     predictions = {
         gid: cat.strip().lower() in positives
diff --git a/tests/fixtures/email/ground_truth.json b/tests/fixtures/email/ground_truth.json
index e493e72a7..b6a5ce758 100644
--- a/tests/fixtures/email/ground_truth.json
+++ b/tests/fixtures/email/ground_truth.json
@@ -1,7 +1,7 @@
 {
   "0039b2c2c79ce354": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -13,7 +13,7 @@
   },
   "01584c7b8ee54ff6": {
     "ambiguous": true,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -25,7 +25,7 @@
   },
   "01b99cbf4076bd85": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -37,7 +37,7 @@
   },
   "0270e7c7c3cf2dbd": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -49,7 +49,7 @@
   },
   "02af2bc580efca9c": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -61,7 +61,7 @@
   },
   "0331e586db6beecc": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -73,7 +73,7 @@
   },
   "05107d8a8e8902e5": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -85,7 +85,7 @@
   },
   "05be3f793f825bf0": {
     "ambiguous": true,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -97,7 +97,7 @@
   },
   "0914d398767caf77": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -109,7 +109,7 @@
   },
   "0d0a0edc3d7f1655": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -121,7 +121,7 @@
   },
   "0d73235e52fe22e5": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -133,7 +133,7 @@
   },
   "0d9d22ee99a31414": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -145,7 +145,7 @@
   },
   "0dac53455383ce87": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -157,7 +157,7 @@
   },
   "0dd088cb18014d56": {
     "ambiguous": true,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -169,7 +169,7 @@
   },
   "0df4cc4af65c0c39": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -181,7 +181,7 @@
   },
   "0e38d3e3de658414": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -193,7 +193,7 @@
   },
   "0f631870938ec9f3": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -205,7 +205,7 @@
   },
   "0f8d1321ad93637f": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -217,7 +217,7 @@
   },
   "10615bf57b103609": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -229,7 +229,7 @@
   },
   "107157659aa52a53": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -241,7 +241,7 @@
   },
   "10ec7574161d746d": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -253,7 +253,7 @@
   },
   "12cc99af87683eca": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -265,7 +265,7 @@
   },
   "13b9073e65646964": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -277,7 +277,7 @@
   },
   "13f3a09ea74b8a0f": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -289,7 +289,7 @@
   },
   "172661e0f889e4bf": {
     "ambiguous": true,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -301,7 +301,7 @@
   },
   "17278778f3ec1f9c": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -313,7 +313,7 @@
   },
   "17dcc02078ceab24": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -325,7 +325,7 @@
   },
   "1a33a8137f27430e": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -337,7 +337,7 @@
   },
   "1ba3a0bfb3be0294": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -349,7 +349,7 @@
   },
   "1c93950535ac01d5": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -361,7 +361,7 @@
   },
   "1d0d36513b432301": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -373,7 +373,7 @@
   },
   "1d8e19ddd2bcb741": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -385,7 +385,7 @@
   },
   "204df847518b333c": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -397,7 +397,7 @@
   },
   "220288ef14d8e00d": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -409,7 +409,7 @@
   },
   "240d7730081b9ba3": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -421,7 +421,7 @@
   },
   "24b322f986eac012": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -433,7 +433,7 @@
   },
   "26a9bacc9f5b81b2": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -445,7 +445,7 @@
   },
   "284ccbfff6e5ceaa": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -457,7 +457,7 @@
   },
   "2a815cc224f58d42": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -469,7 +469,7 @@
   },
   "2acd572540cadc93": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -481,7 +481,7 @@
   },
   "2b09b709adead8ba": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -493,7 +493,7 @@
   },
   "2cb64a0ba21b9268": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -505,7 +505,7 @@
   },
   "2cf804e142471278": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -517,7 +517,7 @@
   },
   "310099835078216e": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -529,7 +529,7 @@
   },
   "3114084d55859295": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -541,7 +541,7 @@
   },
   "3115f04b40fc4c2f": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -553,7 +553,7 @@
   },
   "33b92c14929db56a": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -565,7 +565,7 @@
   },
   "340f55dba2aeb6f3": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -577,7 +577,7 @@
   },
   "341dc1def2924dcb": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -589,7 +589,7 @@
   },
   "3519d0d858262214": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -601,7 +601,7 @@
   },
   "37eb07fad9beaa71": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -613,7 +613,7 @@
   },
   "3a1e0cb982d817bf": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -625,7 +625,7 @@
   },
   "3b72e5900ed16229": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -637,7 +637,7 @@
   },
   "3b7cdf21864bb9fb": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -649,7 +649,7 @@
   },
   "3ba00df3df7cc3fa": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -661,7 +661,7 @@
   },
   "3c9ae2b4907a327e": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -673,7 +673,7 @@
   },
   "3d298912b90be623": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -685,7 +685,7 @@
   },
   "3e060a7638864950": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -697,7 +697,7 @@
   },
   "3ebd9b5933bb073c": {
     "ambiguous": true,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -709,7 +709,7 @@
   },
   "3f18dc0b350fcfa7": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -721,7 +721,7 @@
   },
   "3fec8a834f1cb76a": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -733,7 +733,7 @@
   },
   "41b12b9bba4d9236": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -745,7 +745,7 @@
   },
   "43643ed7433631b9": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -757,7 +757,7 @@
   },
   "43ea2aba2b2d4e79": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -769,7 +769,7 @@
   },
   "441ce1745854b456": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -781,7 +781,7 @@
   },
   "4434b4ac7d1d21ed": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -793,7 +793,7 @@
   },
   "44a7717cc7180dec": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -805,7 +805,7 @@
   },
   "4633737427659afc": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -817,7 +817,7 @@
   },
   "483f7a3ed6ea0821": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -829,7 +829,7 @@
   },
   "488fcd0fa766465c": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -841,7 +841,7 @@
   },
   "4a3ac1a6b2228e46": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -853,7 +853,7 @@
   },
   "4b2c9c244c6d64cb": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -865,7 +865,7 @@
   },
   "4bc416276e06a1f1": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -877,7 +877,7 @@
   },
   "4ed514432cf621b5": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -889,7 +889,7 @@
   },
   "4ee1819f7acd0626": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -901,7 +901,7 @@
   },
   "4f36064c25b26a9a": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -913,7 +913,7 @@
   },
   "4f732ef810d87f00": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -925,7 +925,7 @@
   },
   "4fc33acd7175bf93": {
     "ambiguous": false,
-    "category": "actionable",
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+      "PERSONAL"
     ]
   },
   "a3668842b185971f": {
     "ambiguous": true,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1934,7 +1935,7 @@
   },
   "a4f0920cb2b1ba4e": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1946,7 +1947,7 @@
   },
   "a51f16a07ebb422f": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1958,7 +1959,7 @@
   },
   "a53385bca11efa8e": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1970,7 +1971,7 @@
   },
   "a67517233f89e53e": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1982,7 +1983,7 @@
   },
   "a80f571a6f88af17": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -1994,7 +1995,7 @@
   },
   "a9aecd1e8acae99c": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2006,7 +2007,7 @@
   },
   "aa86795d4a010e79": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2018,7 +2019,7 @@
   },
   "adbfea2474fd792c": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2030,7 +2031,7 @@
   },
   "af3ade86f9ac0556": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2042,7 +2043,7 @@
   },
   "af70540f06d2feb7": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2054,7 +2055,7 @@
   },
   "b41c8e8c1a56f869": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2066,7 +2067,7 @@
   },
   "b42414b3843f7dda": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2078,7 +2079,7 @@
   },
   "b4f5006c33ef70df": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -2090,7 +2091,7 @@
   },
   "b53e4adb6ab9a226": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2102,7 +2103,7 @@
   },
   "b566b26e13605318": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2114,7 +2115,7 @@
   },
   "b6f168cf4a0eda6a": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2126,7 +2127,7 @@
   },
   "b881a320646fe933": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2138,7 +2139,7 @@
   },
   "bb7193d32a828e09": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2150,7 +2151,7 @@
   },
   "be372d3c1eba1dd1": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2162,7 +2163,7 @@
   },
   "bfba698f3b8da4d0": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2174,7 +2175,7 @@
   },
   "c18f46b7b6ed5a61": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -2186,7 +2187,7 @@
   },
   "c4c1e0a8b6b4c9e8": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2198,7 +2199,7 @@
   },
   "c6dcc2c91fc69a40": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2210,7 +2211,7 @@
   },
   "c6df0508d2e1949a": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2222,7 +2223,7 @@
   },
   "c7fa679b429c44e6": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2234,7 +2235,7 @@
   },
   "c99238b82a3ced93": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2246,7 +2247,7 @@
   },
   "cb3b5bc5956ff163": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2258,7 +2259,7 @@
   },
   "cd28b28167a294a7": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2270,7 +2271,7 @@
   },
   "cea53956189038dd": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2282,7 +2283,7 @@
   },
   "cf8e88781a1e264e": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2294,7 +2295,7 @@
   },
   "cfb2135f459918a0": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2306,7 +2307,7 @@
   },
   "d2f7b9b507ee6da3": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2318,7 +2319,7 @@
   },
   "d3e1ac7008005d39": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2330,7 +2331,7 @@
   },
   "d49fc14887c09355": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2342,7 +2343,7 @@
   },
   "d4c3b4ae124dbfcf": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2354,7 +2355,7 @@
   },
   "d5d99e10a2b3fb8a": {
     "ambiguous": true,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2366,7 +2367,7 @@
   },
   "d7d81ec27b54036a": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2378,7 +2379,7 @@
   },
   "d9c437157ad659bb": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2390,7 +2391,7 @@
   },
   "db0866a8d152d0c8": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2402,7 +2403,7 @@
   },
   "dbb62b9aa27b1882": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2414,7 +2415,7 @@
   },
   "dca06c852486fce4": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2426,7 +2427,7 @@
   },
   "e0ffc6304c6d4ae1": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2438,7 +2439,7 @@
   },
   "e1a9d906a7bd450f": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2450,7 +2451,7 @@
   },
   "e29dbca60e95cbc2": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2462,7 +2463,7 @@
   },
   "e38b89da009d89cd": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2474,7 +2475,7 @@
   },
   "e4864064468878f1": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2486,7 +2487,7 @@
   },
   "e4b1e85cc2f58d40": {
     "ambiguous": true,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2498,7 +2499,7 @@
   },
   "e64a06e30d11c983": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2510,7 +2511,7 @@
   },
   "ea20ddf4bf4c3f24": {
     "ambiguous": true,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2522,7 +2523,7 @@
   },
   "ecbc8c846ee404bb": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2534,7 +2535,7 @@
   },
   "f235871a2000d238": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2546,7 +2547,7 @@
   },
   "f3e720ca94b6fb88": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2558,7 +2559,7 @@
   },
   "f58906b71d8da4a3": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -2570,7 +2571,7 @@
   },
   "f5e064daf29bb077": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2582,7 +2583,7 @@
   },
   "f640990c9f4712aa": {
     "ambiguous": false,
-    "category": "actionable",
+    "category": "NEEDS_RESPONSE",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": false,
@@ -2594,7 +2595,7 @@
   },
   "f705177b99e02779": {
     "ambiguous": false,
-    "category": "informational",
+    "category": "FYI",
     "has_attachment": true,
     "is_phishing": false,
     "is_spam": true,
@@ -2606,7 +2607,7 @@
   },
   "f88c7f9bbcf3695e": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": true,
     "is_phishing": true,
     "is_spam": true,
@@ -2618,7 +2619,7 @@
   },
   "fc66af47b97da103": {
     "ambiguous": false,
-    "category": "urgent",
+    "category": "URGENT",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2630,7 +2631,7 @@
   },
   "fe78fe68219f6cba": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
@@ -2642,7 +2643,7 @@
   },
   "fec33466af8df3a0": {
     "ambiguous": false,
-    "category": "low priority",
+    "category": "PROMOTIONAL",
     "has_attachment": false,
     "is_phishing": false,
     "is_spam": false,
diff --git a/tests/unit/test_synthetic_mbox.py b/tests/unit/test_synthetic_mbox.py
index f2bbf228c..f265b3a80 100644
--- a/tests/unit/test_synthetic_mbox.py
+++ b/tests/unit/test_synthetic_mbox.py
@@ -77,13 +77,13 @@ def test_message_count_matches_target(mbox_obj: mailbox.mbox, labels: dict) -> N
 
 
 def test_category_coverage_and_counts(labels: dict) -> None:
-    # Categories use the production taxonomy strings: the low bucket is
-    # "low priority" (space), NOT "low_priority".
+    # Categories use the schema-2.0 five-bucket taxonomy strings (#1615),
+    # matching gaia_agent_email.tools.triage_heuristics.ALL_CATEGORIES.
     category_counts = Counter(meta["category"] for meta in labels.values())
-    assert category_counts["urgent"] >= 20
-    assert category_counts["actionable"] >= 45
-    assert category_counts["informational"] >= 55
-    assert category_counts["low priority"] >= 30
+    assert category_counts["URGENT"] >= 20
+    assert category_counts["NEEDS_RESPONSE"] >= 45
+    assert category_counts["FYI"] >= 55
+    assert category_counts["PROMOTIONAL"] >= 30
 
     spam_count = sum(1 for meta in labels.values() if meta["is_spam"])
     phishing_count = sum(1 for meta in labels.values() if meta["is_phishing"])
@@ -173,12 +173,40 @@ def test_ground_truth_required_fields(labels: dict) -> None:
         assert required.issubset(meta.keys())
 
 
+def test_corpus_vocab_matches_scorer_taxonomy(labels: dict) -> None:
+    """Guard against taxonomy drift (#1874): every committed ground-truth label
+    must be a valid schema-2.0 category, and the scorer's attention axis must be
+    drawn from that same taxonomy. The eval scorer compares case-insensitively,
+    so compare on the lower-cased vocabulary.
+    """
+    from gaia_agent_email.tools.triage_heuristics import ALL_CATEGORIES
+
+    from gaia.eval.quality_metrics import NEEDS_ATTENTION_CATEGORIES
+
+    taxonomy = {c.lower() for c in ALL_CATEGORIES}
+    corpus_vocab = {meta["category"].lower() for meta in labels.values()}
+    assert corpus_vocab <= taxonomy, (
+        f"corpus labels {sorted(corpus_vocab)} drifted from schema-2.0 taxonomy "
+        f"{sorted(taxonomy)} — regenerate ground_truth.json"
+    )
+    assert NEEDS_ATTENTION_CATEGORIES <= taxonomy, (
+        f"scorer attention axis {sorted(NEEDS_ATTENTION_CATEGORIES)} is not a "
+        f"subset of the taxonomy {sorted(taxonomy)}"
+    )
+
+
 def test_meta_block_present(gt: dict) -> None:
     assert "_meta" in gt
     meta = gt["_meta"]
     assert meta["fixture"] == "synthetic_inbox.mbox"
     assert meta["fixture_kind"] == "synthetic"
-    assert meta["taxonomy"] == ["urgent", "actionable", "informational", "low priority"]
+    assert meta["taxonomy"] == [
+        "URGENT",
+        "NEEDS_RESPONSE",
+        "FYI",
+        "PROMOTIONAL",
+        "PERSONAL",
+    ]
 
 
 def test_generator_determinism_verify_mode() -> None: