Agentic Coding Systems.
Prompt, context, harness, graph, swap. Score every prompt you ship, stop the six-hour context fade, build the loop and guardrails that make one agent trustworthy on real code, run a fleet of them in parallel with cost and verification attached, then keep all of it when the model underneath changes.
5 titles · 15 free guides
How to Get Claude Code to Finish the Job on the Cheaper Model
Get haiku finishing jobs you were paying sonnet to attempt, and quote what one finished job costs with the failures counted in. My first five runs finished nothing on either model; eleven words of job text later both went six for six.
from: Your Agent Is More Than the Model
How to Build a Kill Switch for Claude Code and Codex
Let Claude Code or Codex run unattended on real work, because one empty file from any terminal stops it at the next tool call. A founder typed STOP eleven times in capitals and lost 1,200+ executive records; this stop doesn't ask the model.
from: Your Agent Is More Than the Model
How to Know If Sonnet Is Worth 3x Haiku on Your Code
Pick the Claude model you pay for on a real job from your own repo, and have an answer the same afternoon a new model ships. Both models passed my test job and one cost three times as much, and the same model re-run moved 15% with nothing changed.
from: Your Agent Is More Than the Model
How to Resume a Long Claude Code Job Without Starting Over
Hand Claude Code or Codex a long job and let it crash, because a fresh session picks up at the next unfinished step on a 122-byte brief. One Codex run spent 7.13 million tokens asking its workers the same question 47 times, because nothing wrote the answer down.
from: Your Agent Is More Than the Model
How Long Does It Take to Switch From Claude Code to Codex?
Try Codex, a cheaper model or a local one whenever you like, because you already know what the move costs you in hours, layer by layer. My whole setup came to 3 hours to move, and the expensive row was the run state I had never saved.
from: Your Agent Is More Than the Model
AI Agent Guardrails: Gate Every Tool Call
AI agent guardrails belong on one line of code: the tool call. Build a deterministic gate that classifies, approves, and fails safe before any action runs.
from: Agentic Coding: Build the Harness
Build an AI Coding Agent From Scratch in Python
Build an AI coding agent from scratch in Python: the ~150-line agent loop that reads files, writes code, runs tests, and stops on its own. No framework.
from: Agentic Coding: Build the Harness
What Is an Agent Harness? The 7 Layers
What is an agent harness? The 7 layers wrapped around the model: loop, context, guardrails, tools, verification, recovery, orchestration. With a teardown table.
from: Agentic Coding: Build the Harness
Why AI Agents Report False Success
Why AI agents report false success: the bias that makes them grade their own work, the $1.78M bug it shipped, and the independent check that catches it.
from: Agentic Coding: Build the Harness
Give Your Claude Code Subagents Memory Without a Database
Full graph indexing costs about a thousand times what plain vector indexing costs, and frequently loses. Here is the three-layer file store that replaces it, with a pointer that walks any claim back to the sentence it came from.
from: Claude Code In Parallel
How to Stop a Claude Code Subagent From Faking a Test Pass
A verifier subagent will report a clean pass on tests it never executed unless you make the verdict a file it had to run something to produce. Mine did exactly that on 8 test cases, 0 of which ran, and the code being fine is the part that should worry you.
from: Claude Code In Parallel
How Do Claude Code Subagents Communicate? They Don't
There is no channel between subagents. If two of them have to agree on anything, the agreement lives in a file with exactly one owner per field, or it does not exist. Here is the file, and the race that eats it.
from: Claude Code In Parallel
Why You Shouldn't Use a Model to Merge Claude Code Subagent Results
A model asked to combine parallel agent findings is slow, gives different answers on different days, and can return a file path no searcher ever found. Four lines of shell do it deterministically and print a duplicate count that tells you how well you scoped the run.
from: Claude Code In Parallel
Claude Code Subagents in Parallel: Are They Actually Faster?
I timed the same job with one Claude Code agent and with three subagents in parallel, same repo, same afternoon. The graph lost twice. Here is how to measure your own floor and get a verdict on your own work.
from: Claude Code In Parallel
Read them in this order. Each one assumes the one before it.
Prompt Engineering
A golden set, a calibrated judge, and a CI gate that blocks a bad prompt change before a user sees it
Context Engineering
11 tools that kill context rot, a handoff packet a dead session passes on, and a token bill with a measured before and after
Agentic Coding: Build the Harness
The loop, the guardrails, and the verification layer that make an agent reliable outside a demo
Claude Code In Parallel
Twelve working graph systems on your own repo, a real cost number per run, and one packaged as a client deliverable
Your Agent Is More Than the Model
A model you swap in one line, a token budget that holds, and an eval set that tests the next model the day it ships
These titles sit on paths that tells you which three to buy first.