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Field notes.

Issue 51 · July 2026Prompt engineering, quietly

Writing about the craft of prompting, the shape of agents, and the small engineering decisions that make models useful in real work.

№ 01 · Featuredprompt engineering8 min read

MCP Working Groups in 2026

Discover how MCP working groups decentralize protocol development, reduce glue code, and improve interoperability. Learn the model and see examples inside.

RephraseJune 10, 2026Read the essay →
Recently  ·  July 2026
  1. № 02

    MCP Gateway Behavior: 3 Critical Boundaries

    Discover MCP gateway behavior for authorization propagation, session affinity, and inspection boundaries. Learn patterns, pitfalls, and fixes. Read the full guide.

    prompt engineering
    RephraseJune 10, 2026  ·  8 min read
  2. № 03

    MCP Configuration Portability Ends Setup Hell

    Learn how MCP configuration portability can eliminate repetitive setup across clients, reduce drift, and simplify secure agent workflows. Read the full guide.

    prompt engineering
    RephraseJune 10, 2026  ·  8 min read
  3. № 04

    Cost Attribution for Autonomous Agents

    Discover why per-tenant cost tracking fails at the protocol layer for autonomous agents, and learn practical attribution patterns you can use today.

    prompt engineering
    RephraseJune 9, 2026  ·  8 min read
  4. № 05

    x402 and Stripe MPP in 2026

    Learn how x402 and Stripe MPP are shaping agent payments in 2026, what they solve, and where the security gaps still live. Read the full guide.

    prompt engineering
    RephraseJune 9, 2026  ·  8 min read
  5. № 06

    Agent Attack Types: 10 Critical Threats

    Learn how goal hijacking and memory poisoning break AI agents, with 10 critical attack types, examples, and defenses. Read the full guide.

    prompt engineering
    RephraseJune 9, 2026  ·  8 min read
  6. № 07

    Async Coding Workflows with Worktrees

    Learn how background agents and Git worktrees make async coding faster, safer, and easier to scale across parallel tasks. Read the full guide.

    prompt engineering
    RephraseJune 9, 2026  ·  8 min read
  7. № 08

    LangGraph at Scale: What Klarna Shows

    Learn how to design LangGraph production systems from Klarna-style workloads, with routing, state, and guardrails that hold up in production. Try free.

    prompt engineering
    RephraseJune 9, 2026  ·  8 min read
  8. № 09

    Devin's Sweet Spot for PR Scopes

    Learn how to scope PR tasks for Devin's 67% merge benchmark, using benchmark-backed prompts, tighter specs, and better test seams. Read the full guide.

    prompt engineering
    RephraseJune 8, 2026  ·  8 min read
  9. № 10

    Why 8-12x AI Efficiency Is Real

    Learn how Nubank-style Devin migrations achieve 8-12x efficiency, what the bottlenecks are, and how to measure real gains. Read the full guide.

    prompt engineering
    RephraseJune 8, 2026  ·  7 min read
  10. № 11

    WebAssembly for Agent Sandboxing

    Learn how WebAssembly sandboxing improves agent security boundaries beyond containers, with practical prompts, risks, and deployment patterns. Read the full guide.

    prompt engineering
    RephraseJune 8, 2026  ·  7 min read
  11. № 12

    Federated Agent Identity and Trust

    Master federated agent identity for autonomous systems and learn how identity, delegation, and reputation reshape trust. See examples inside.

    prompt engineering
    RephraseJune 8, 2026  ·  9 min read
Page 2 of 51
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