The False Green Baseline: When a Passing Test Suite Hides a Broken Type-Check
How an AI coding agent's type-check gate misattributed pre-existing LSP errors to a correct rename, and why gating on the change delta is the answer.
Architecture
Raising the Floor under the Coder: Generalizing an AI Coding Agent across Ticket Types
An AI coding agent went from one ticket type to six, with four architectural moves that raised the floor to deliver zero-Coder results on four types.
Agent Pipeline Grounding Chat: From Free-Form Q&A to Typed Fields
Two open quality items are closed. Operator design decisions flow through typed handoff fields. The grounding chat has a structural defense against LLM drift.
From LLM Author to LLM Reviewer: An AI Coding Agent Authors a Production Feature With Zero LLM Code Generation
The pipeline completed a multi-layer TypeScript feature with zero LLM code generation: 6/6 ticket tests, 959/959 suite, $0.308 versus $0.681.
Grounding an Autonomous Engineering Pipeline in Operator Design: The Pre-Autonomous Chat Stage
A new pre-autonomous chat stage lets the operator ground design decisions in the registry before the pipeline runs, adding a new top to the trust hierarchy.
From LLM Luck to Structurally Guaranteed: One Ticket Across Four Architectural Eras
Seven pipeline runs, one ticket, four architectural eras. Per-test cost dropped from $0.385 to $0.074 by replacing LLM guesswork with structural derivation.
Engineering Around LLM Non-Determinism: The Architectural Follow-Up to 248 Runs
What shipped in the three weeks after the 248-run hallucination ceiling: removing the LLM from computable decisions and validating everything else.
What the Symbol Registry Stores, and How It Stays Fresh
The data model behind the symbol registry: per-symbol records, file-level hashes, call-graph edges, and the invalidation strategy that keeps it current.
What Calls This Function? Why AI Coding Agents Need a Language Server
Tree-Sitter tells you where a symbol is defined. It cannot tell you where it is called. That gap cost one pipeline run 33,000 tokens to find out.
The Quality Gate That Passed When It Failed
A Haiku optimization made the L2 quality gate silently pass on every run. The fix was removing the LLM call entirely.
Why AI Coding Agents Fail on Evolving Codebases
Not a model capability problem. An agent with the wrong codebase version produces output that is plausible but wrong in ways that are hard to catch.