Dashboard › › Session ses_384819f1
ses_384819f18ffe2RlsG3XMqr8EUUBased on the summary, the "assistant message prefill" error occurs when the gradient context ends with a synthetic assistant message (from distilledPrefix). This causes Anthropic's API to reject the request since it doesn't support "assistant message prefill" (a conversation that ends with an assistant turn).
The two-layer fix was:
gradient.ts: In stripToTextOnly, if all parts would be stripped (leaving an empty user message), insert a '...' placeholder to prevent empty user messages from being skippedindex.ts: Added a safety net that drops any trailing assistant messages after the transform to ensure conversations always end with a user message[1/15] ✓ default nuum-dev "What type does CuratorOp.crossProject have, and wh..." [2/15] ✓ default nuum-dev "What technique did the nuum gradient context manage [3/15] ✓ default nuum-dev "What was the 'assistant message prefill' error that [4/15] ✓ default nuum-dev "What was the system-reminder leak bug in the nuum g [5/15] ✗ default nuum-dev "What was the FTS5 search bug fixed in ltm.ts at the [6/15] ✗ default nuum-dev "How many existing knowledge entries were bulk-updat [7/15] ✓ default nuum-dev "Why did the eval test sessions appear in the OpenC [8/15] ✓ default sentry-cli "What PR number and title was being tested at the st [9/15] ✓ default sentry-cli "What SQLite error occurred when first running `proj [10/15] ✗ default sentry-cli "How many Sentry organizations were accessible for t [11/15] ✓ default sentry-cli "How many test failures were there locally and what [12/15] ✓ default sentry-cli "What was the final patch coverage percentage after [13/15] ✓ default sentry-cli "What migration was added to fix the pagination_curs [14/15] ✓ default auth-api "What new CLI command was added in this session, and [15/15] ✓ default auth-api "Why was /users/me/ problematic for getting the auth
=== Results === default 12/15 (80.0%)
Done! ...
<path>/home/byk/Code/opencode-nuum/MEMORY_PLAN.md</path> <type>file</type> <content>1: # Nuum Memory Improvement Plan 2: 3: Based on: LongMemEval oracle evaluation (Feb 2026) + Mastra Observational Memory analysis. 4: 5: ## Benchmark Results (baseline) 6: 7: | System | Model | LongMemEval | Dataset | 8: | ------------------------- | -------------- | ----------- | ------------- | 9: | Mastra OM | gpt-5-mini | 94.87% | longmemeval_s | 10: | Mastra OM | gpt-4o | 84.23% | longmemeval_s | 11: | **Nuum (post-Phase-1+2)** | **Sonnet 4.6** | **TBD** | **oracle** | 12: | Nuum (original) | Sonnet 4.6 | 73.8% | oracle | 13: | Baseline (full context) | Sonnet 4.6 | 72.6% | oracle | 14: 15: ### Nuum oracle breakdown (pre-improvement) 16: 16: ### Nuum oracle breakdown (pre-improvement) 17: ... ...
[main 7e2f61a] Observer prompt refinements + eval fixes: 93.3% nuum / 80.0% default (+13.3pp / +6.7pp) 5 files changed, 60 insertions(+), 133 deletions(-) [assistant]: The session now wraps up the improvements with documented results. Here's the final picture: **What was improved:** 1. **Observer prompt**: Added explicit rule that exact numbers from the conversation must be preserved verbatim, and that bug fixes/code changes early in a session are high priority (never drop them) 2. **Reflector prompt**: Added rule that when segments conflict on a number, keep the earlier segment's value; added rule that early-session details must survive into the reflection 3. ...