From 765834b3d60584c468708783ece986be7d2cdfce Mon Sep 17 00:00:00 2001
From: danbusse <81775558+danbusse@users.noreply.github.com>
Date: Mon, 22 Jun 2026 22:47:49 -0600
Subject: [PATCH] fix: increase max_tokens to 16000 to prevent JSON truncation

---
 backend/app/services/ai/deck_service.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/backend/app/services/ai/deck_service.py b/backend/app/services/ai/deck_service.py
index a7a3f39..5dd4eee 100644
--- a/backend/app/services/ai/deck_service.py
+++ b/backend/app/services/ai/deck_service.py
@@ -11,6 +11,11 @@ from app.services.ai import prompts
 from app.services.ai.claude_client import call_claude, DeckPayload
 from app.services.ai.constraints import build_constraint_context, build_owned_card_list
 
+# A full 99-card deck with reasoning needs ~16000 tokens
+GENERATE_MAX_TOKENS = 16000
+COMPLETE_MAX_TOKENS = 16000
+CULL_MAX_TOKENS = 16000
+
 
 async def generate_deck(req: GenerateRequest, user_id: int, db: AsyncSession) -> Deck:
     owned_names = await _owned_names(user_id, db) if req.constraints.prefer_owned else []
@@ -20,7 +25,7 @@ async def generate_deck(req: GenerateRequest, user_id: int, db: AsyncSession) ->
         constraint_text=build_constraint_context(req.constraints, owned_names or None),
         owned_list_text=build_owned_card_list(owned_names),
     )
-    payload = await call_claude(system, user_msg)
+    payload = await call_claude(system, user_msg, max_tokens=GENERATE_MAX_TOKENS)
     return await _persist_deck(
         payload=payload, user_id=user_id, mode=DeckMode.GENERATE,
         commander=req.commander, name=req.name or payload.deck_name,
@@ -38,7 +43,7 @@ async def complete_deck(req: CompleteRequest, user_id: int, db: AsyncSession) ->
         constraint_text=build_constraint_context(req.constraints, owned_names or None),
         owned_list_text=build_owned_card_list(owned_names),
     )
-    payload = await call_claude(system, user_msg)
+    payload = await call_claude(system, user_msg, max_tokens=COMPLETE_MAX_TOKENS)
     return await _persist_deck(
         payload=payload, user_id=user_id, mode=DeckMode.COMPLETE,
         commander=req.commander, name=req.name or payload.deck_name,
@@ -61,7 +66,7 @@ async def cull_deck(req: CullRequest, user_id: int, db: AsyncSession) -> Deck:
         owned_list_text=build_owned_card_list(owned_names),
         prefer_owned=req.constraints.prefer_owned,
     )
-    payload = await call_claude(system, user_msg, max_tokens=10000)
+    payload = await call_claude(system, user_msg, max_tokens=CULL_MAX_TOKENS)
     return await _persist_deck(
         payload=payload, user_id=user_id, mode=DeckMode.CULL,
         commander=req.commander, name=req.name or payload.deck_name,