How accountLedger.ts answers "what did this account cost today" from a request log that runs to hundreds of megabytes, by keeping a byte-offset cursor per file and never re-reading a line it has already consumed.

How NeuroLink's Claude proxy joined two mismatched endpoints and a 930MB request log into one GET /accounts row per account, and the three review defects — a requestId collision, a mistagged account, and a test that could never fail — that shaped the final shape.

Azure OpenAI has no row in NeuroLink's OPENAI_COMPAT_CATALOG. ADR-0002 names the reason directly: four hook overrides — URL building, auth headers, request-body mutation, and response-format handling — that a data row cannot express, so Azure stays a hand-written subclass on purpose.

Six of NeuroLink's seven OpenAI-compatible providers read their model env var at registration time; Mistral's registration passes a bare literal instead, so MISTRAL_MODEL is silently ignored on the default `generate()` path.

A gzip decompression bomb in NeuroLink's ArchiveProcessor used to be caught only after the whole payload was inflated. Moving the bound into the decoder itself, via Node's `maxOutputLength`, cut peak RSS on a 400MB bomb from 411MB to 102MB.

client.callTool() in NeuroLink's realtime LiveKit agent used to run with no RequestOptions, so a stalled MCP server held a speech-to-speech turn open indefinitely. A 30-second toolTimeoutMs, sized against conversation latency rather than server latency, bounds the call and routes the failure through the handler's existing catch block instead of leaving the user in silence.

How NeuroLink's runIsolatedAgent() and registerAgentTool() turn the hand-copied "worker sub-agent" pattern from Curator and Yama into a real extension point, with delegation caps, depth limits, and leashed multi-leg runs.

A process-wide delegation pool caps concurrent sub-agent runs at four, an open-handle check stops the same agent from being restarted mid-investigation, and every refusal ships with its own recovery instruction back into the model.

neurolink proxy replay export turns a body-capture log line into a hash-verified, redacted bundle; compare only replays it against the real upstream once --execute and per-header environment variables are supplied explicitly.

How NeuroLink's CLI proxy hands a live TCP socket from one worker process to another over IPC — a listener that never closes, a generation counter instead of a restart, and a two-phase commit so a socket is never lost in transit.