NexusMem Gives Coding Agents Access to Failed Attempts, Not Just Shipped Code

A solo developer has built NexusMem, an open-source tool designed to give coding agents richer context by indexing git logs, shell history, and the reasoning behind decisions that never made it into commits. The tool uses a hybrid retrieval approach combining BM25 over SQLite FTS5 and vector search via sqlite-vec, with scores adjusted for signal strength and recency. The developer identified a ranking flaw through real-world testing on the tool's own repository, where the most relevant commit ranked lower than unrelated ones, and corrected the scoring formula based on empirical results. NexusMem requires only Node 22 and git to run, with Ollama as an optional dependency that enables semantic search. Within weeks of sharing the project, two independent contributors submitted fixes unprompted, which the developer described as a sign the project had become legible enough for others to navigate without guidance.