https://ebkac.org/tags/langchain/ Recent content in Langchain on EBKAC.ORG Hugo en-gb Sat, 21 Mar 2026 00:00:00 +0000 https://ebkac.org/blog/2026-03-21-buchhalter-tdd-and-types/ Sat, 21 Mar 2026 00:00:00 +0000 https://ebkac.org/blog/2026-03-21-buchhalter-tdd-and-types/ <p>After <a href="https://ebkac.org/blog/2026-03-20-buchhalter-phase3-infrastructure/">Part 3</a> left four LXC containers running and the <code>src/</code> directories empty, Phase 4 starts writing actual code. The first day of implementation produces two closed issues, one rejected framework, and one bug that had already been caught once.</p> <blockquote> <p><strong>Part 4 of the <a href="https://ebkac.org/blog/2026-03-18-buchhalter-agentic-setup/">Building BuchhalterPython</a> series.</strong> <a href="https://ebkac.org/blog/2026-03-20-buchhalter-phase3-infrastructure/">Part 3</a> covers provisioning four LXC containers with OpenTofu and Ansible.</p> </blockquote> <h2 id="the-bug-that-appeared-twice">The Bug That Appeared Twice</h2> <p>Issue #12 had already documented a type error in the Pydantic model for the Paperless API: <code>tags: list[str]</code> instead of <code>list[int]</code>. Paperless returns tag IDs as integers. The model had used strings. That bug was fixed, documented in <code>llm/domain-knowledge/01-paperless-api-reference.md</code>, and noted in <code>ERROR_PATTERNS.md</code>.</p>