Field notes & protocols

Engineering & Architecture Blog

Deep dives into protocol reverse-engineering, low-latency SIP trunking, AI agent state synchronization, and enterprise WhatsApp scaling.

Designing MCP Servers Agents Actually Use — WhatsMCP Engineering
AI Agents Sep 11, 2026 · 11 min read

Designing MCP Servers Agents Actually Use

A builder's field guide to Model Context Protocol servers in 2026: shaping tools as an agent UI, escaping the context tax with code execution, defending against tool poisoning, and living with the new stateless spec.

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Bridging WhatsApp and the PBX — a low-latency SIP trunking bridge. WhatsMCP Engineering.
SIP Trunking Sep 11, 2026 · 14 min read

Bridging WhatsApp and PBX: Low-Latency SIP Trunking Internals

A deep technical tour of the real-time transcoding bridge that connects WhatsApp calls to Asterisk and FreeSWITCH: dual-plane signaling, Opus/G.711 transcoding, jitter buffering, PLC, a sub-50 ms media path, and the war stories behind each decision.

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The MLow codec in pure Go — a clean-room encoder and decoder for Meta's low-bitrate voice codec. WhatsMCP Engineering.
Audio Codecs Sep 11, 2026 · 13 min read

Rebuilding MLow: WhatsApp's Voice Codec in Pure Go

How we built a clean-room, pure-Go encoder and decoder for MLow — Meta's low-bitrate codec behind billions of WhatsApp, Messenger and Instagram calls: the hybrid SILK/CELT structure, reverse-engineering it against the live library, and frame-exact validation.

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Connect WhatsApp to Claude with WhatsMCP — one secure MCP endpoint gives Claude 43 tools across your own numbers.
AI Agents Sep 11, 2026 · 5 min read

Connect Your WhatsApp to Claude with WhatsMCP

Connect the WhatsMCP MCP server to Claude in minutes — Claude Code, Claude Desktop and claude.ai — over OAuth or an API key, giving Claude 43 tools to read, reply and organize across your own WhatsApp numbers. With three use cases to try first.

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Real-time WhatsApp webhooks with WhatsMCP — inbound messages pushed to your own HTTPS endpoint, signed and structured.
Integrations Sep 11, 2026 · 5 min read

Set Up WhatsMCP Webhooks for Real-Time WhatsApp

Push every inbound WhatsApp message to your own HTTPS endpoint the instant it arrives — how to register a WhatsMCP webhook, verify the signature, build a receiver that never loses a message, and three things to build on inbound events.

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Per-account egress in WhatsMCP — give every WhatsApp number its own exit IP via WireGuard or SOCKS5.
Infrastructure Sep 11, 2026 · 6 min read

Per-Account Egress: SOCKS5 & WireGuard for WhatsApp

Why every WhatsApp number should have its own exit IP, and how to set per-account egress in WhatsMCP — Direct, WireGuard or SOCKS5 — with screenshots and operating tips for keeping a fleet of numbers healthy.

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Schematic diagram of a ring of phone nodes connected to a central MCP hub, in the Terminal Noir style.
AI Agents Oct 2, 2024 · 6 min read

Scaling AI Agent Fleets with Model Context Protocol

An architectural walkthrough on exposing WhatsApp thread history and tools natively to Claude and custom agent runtimes securely.

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Schematic diagram of traffic from a column of nodes converging through a shared egress gateway, in the Terminal Noir style.
Infrastructure Sep 19, 2024 · 12 min read

Anti-Block Safeguards: Rate Limiting & Egress IP Rotation

An inside look at our proxy layer, fingerprint emulation, and distributed egress management designed to mimic official client traffic profiles.

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Schematic diagram of Opus and G.711 waveforms converging into a transcoder node, in the Terminal Noir style.
Configuration Sep 5, 2024 · 5 min read

PJSIP Configuration & Codec Transcoding Secrets

Optimizing pjsip.conf parameters for flawless G.711u to Opus conversion under high-throughput concurrent call loads.

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