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A Complete Guide To AGENTS.md

Guide · Matt Pocock · Intermediate

You want to write project instructions that help coding agents understand commands, conventions, architecture, and working boundaries.

agents.md, context engineering, ai coding, agentic workflows

Building Coding Agents with Tool Execution

Short course · DeepLearning.AI · Intermediate

You want to understand how coding agents use tools, inspect code, run commands, and iterate on software tasks.

coding agents, tool execution, developer tools, agents, ai coding

Claude Code: A Highly Agentic Coding Assistant

Short course · DeepLearning.AI · Beginner to intermediate

You want a structured Claude Code course before using it on a serious codebase.

claude code, coding agents, developer tools, ai coding, anthropic

SWE-bench

Software-engineering agent benchmark · SWE-bench team · Intermediate to advanced

Measuring whether coding agents can resolve real GitHub issues by producing repository patches that pass executable tests.

evals, llm evaluation, ai quality, benchmarks and learning resources

Claude Sonnet 5.5 explained

Model migration explainer · Anthropic · Intermediate to advanced

Anthropic released Claude Sonnet 5.5 on September 28, 2026. Use this guide to understand the efficiency claims, breaking API changes, and a safe migration test from Sonnet 5.

claude sonnet 5.5, claude code, coding agents, model migration, adaptive thinking

Ember-1 explained

Reasoning-efficient coding model explainer · Fireworks AI · Intermediate to advanced

Fireworks released Ember-1 on September 23, 2026 as a Kimi K3-based model trained to use fewer reasoning tokens. Use this explainer to evaluate the quality, cost, latency, and context-growth claims on your own agent workload.

ember-1, kimi k3, reasoning models, reasoning tokens, cost optimization

Grok 4.7 explained

Frontier coding model launch explainer · SpaceXAI · Intermediate to advanced

SpaceXAI released Grok 4.7 on September 21, 2026 for coding, agentic tasks, and knowledge work. Use this guide to compare its task reliability and total cost with your current model.

grok 4.7, coding agents, long-running agents, model selection, evals

Union Alpha revealed as Pareto 26.9

Multi-model routing launch explainer · Unbiased · Intermediate to advanced

Union Alpha was revealed as Unbiased's Pareto 26.9 on September 17, 2026: a hosted system that routes work across several models and returns one checked answer.

pareto 26.9, union alpha, model routing, ensembles, coding agents

The Anatomy of Harness Engineering

Coding agent evaluation guide · Google Developers Blog · Intermediate to advanced

You want Google's September 9, 2026 guide to evaluating coding agents with small behavioral checks, outcome-based assertions, and batch runs that catch regressions without treating a single benchmark score as the whole story.

coding agents, evals, behavioral evaluations, regression testing, harness engineering

Claude Fable 5.1 and Claude Mythos 5.1

Model launch and safety guide · Anthropic · Advanced

You want Anthropic's September 1, 2026 model announcement covering Fable 5.1 for general availability and Mythos 5.1 for trusted-access research use.

anthropic, claude, frontier models, coding agents, ai safety

Qwen Code September 10 weekly update

Coding agent workflow release notes · Qwen · Intermediate to advanced

You want Qwen Code's September 10, 2026 update on workflow run history, agent and token observability, context-usage inspection, combining Plan with YOLO mode, and named parallel channel tasks in isolated workspaces.

qwen code, coding agents, workflow observability, context management, planning

Modernizing complex legacy code with AI agents

Agent migration case study · Mistral AI · Intermediate to advanced

You want Mistral's September 9, 2026 field report on migrating 40,000 lines of Fortran 77 to C++, including a parity harness built before migration, agent-generated documentation, planner-coder-tester-reviewer workflows, and the human checkpoints needed for maintainable results.

mistral, coding agents, legacy modernization, parity testing, agent workflows

Muse Spark 1.3

Model launch and selection guide · Meta AI · Intermediate

You are comparing frontier models for long-horizon coding or knowledge work and need Meta's September 2, 2026 release notes on Muse Spark 1.3's tool use, instruction following, user steering, multitasking, model self-awareness, and availability through Muse Code and Meta Model API.

meta, muse spark 1.3, frontier models, coding agents, long-horizon agents

How GitHub makes AI coding more cost efficient

Coding agent evaluation guide · GitHub · Intermediate to advanced

You want GitHub's September 2, 2026 evidence for measuring coding-agent efficiency across the whole task, including selective output compression, preserving useful context, benchmark regressions, and controlled production experiments.

github copilot, coding agents, context engineering, evals, cost optimization

Research acceleration: The view inside OpenAI

Research report · OpenAI · Intermediate

You want OpenAI's September 6, 2026 evidence and measurement framework for how coding agents are changing research workflows, including task delegation, parallel agent use, capability tracking, and the limits of interpreting productivity signals.

openai, codex, research agents, automated research, agent adoption

Project HydraFusion

Model orchestration research preview · GitHub · Intermediate to advanced

You want GitHub's September 4, 2026 technical explanation of runtime model orchestration for coding tasks, including plan decomposition, draft-critique-revise patterns, model cascading, evaluation design, and quality-versus-cost tradeoffs.

github copilot, model orchestration, model selection, coding agents, evals

Spec-Driven Development with Coding Agents

Short course · DeepLearning.AI · Beginner

You want a concise, hands-on course for replacing vague vibe-coding prompts with project constitutions, feature specs, plan-implement-verify loops, legacy-code workflows, and a portable custom agent skill.

coding agents, spec-driven development, agent skills, planning, verification

Designing the hf CLI for agents

Agent tooling and evaluation guide · Hugging Face · Intermediate

You want a measured guide to agent-friendly CLI design, including structured output, retry-safe commands, independent grading, and benchmarks showing where higher-level tools reduce calls and token use.

hugging face, coding agents, hf cli, evals, codex

Give Your Coding Agents a Memory You Own

Open-source guide and repo · Hugging Face · Intermediate

You want a September 3, 2026 walkthrough of funes, an open-source local memory layer that indexes agent traces, preserves provenance, and lets Claude Code, Codex, pi, and Hermes recall decisions across sessions and machines.

hugging face, coding agents, agent memory, codex, claude code

Qwen Code September 3 weekly update

Coding agent release notes · Qwen · Beginner to advanced

You want Qwen's September 3, 2026 practical guide to its latest coding-agent workflows, including learning-oriented output styles, scheduled tasks, a browser terminal, safer workspace writes, skills, MCP stability, and current vision-model support.

qwen code, coding agents, output styles, scheduled tasks, web shell

Simon Willison on GPT-6 Astra

Model analysis · Simon Willison · Intermediate to advanced

You want a concise independent read of GPT-6 Astra's launch claims, benchmark caveats, long-context results, pricing, and early comparison with Claude Fable 5.1 and GPT-5.6 Sol.

gpt-6 astra, model selection, benchmarks, coding agents, long context

Claude Fable 5.1 model overview

Model docs · Anthropic · Intermediate to advanced

You need Anthropic's September 1, 2026 source of truth for Claude Fable 5.1 and invite-only Mythos 5.1, including model IDs, pricing, availability, long-horizon agent strengths, and breaking changes from Fable 5.

anthropic, claude fable 5.1, claude mythos 5.1, frontier models, model selection

Prompting Claude Fable 5.1

Prompting guide · Anthropic · Intermediate to advanced

You are testing or migrating to Claude Fable 5.1 and want model-specific guidance for effort, progress updates, tool-call batching, long tasks, compaction, subagents, file edits, and verification.

anthropic, claude fable 5.1, prompting, coding agents, tool use

OpenAI Sandbox Agents

Guide · OpenAI · Intermediate to advanced

You need the official beta guide to giving Python or TypeScript Agents SDK workflows isolated files, commands, packages, ports, snapshots, and resumable state while keeping the agent harness and sensitive control-plane work outside the execution container.

openai, agents sdk, sandbox, coding agents, containers

OpenAI model guide

Model docs · OpenAI · Beginner to advanced

You need to choose between current GPT-5.6 variants, smaller GPT-5.4 variants, reasoning levels, tool support, and cost-sensitive API paths, including the current default starting points of GPT-5.6 Sol, Terra, and Luna.

openai, gpt, gpt-5, reasoning models, model selection

OpenAI deprecations

Migration guide · OpenAI · Intermediate

You need OpenAI's current retirement schedule and recommended replacements before pinning model IDs in evals, coding agents, or user-facing features.

openai, deprecations, migrations, model selection, release notes

Codex for Builders

Official training · OpenAI · Intermediate

You want OpenAI's practical Codex overview for real development workflows, including the CLI, IDE, GitHub, GPT-5-Codex, MCP, and code-review patterns.

openai, codex, coding agents, cli, ide

Codex Bootcamp

Official bootcamp · OpenAI · Intermediate to advanced

You want a current OpenAI learning series on agentic coding, shared team workflows, approvals, sandboxing, memory, subagents, and production automation.

openai, codex, coding agents, team workflows, automation

OpenAI MCP and connectors

Guide · OpenAI · Intermediate

You need the official OpenAI path for wiring MCP servers and connectors into agent workflows instead of inventing your own tool contract.

openai, mcp, connectors, agents, tool use

OpenAI Skills

Guide · OpenAI · Intermediate

You want the official OpenAI guide for packaging reusable skills with SKILL.md manifests instead of copying long instructions into every agent session.

openai, skills, agent skills, workflows, coding agents

OpenAI Subagents

Guide · OpenAI · Intermediate to advanced

You want the official OpenAI guidance for splitting larger coding or review work across narrow custom agents without polluting the main task context.

openai, codex, subagents, parallel workflows, coding agents

OpenAI Codex Prompting Guide

Guide · OpenAI · Intermediate to advanced

You want the newest OpenAI guidance for prompting Codex-style coding workflows, especially when using newer Codex models with preambles and execution phases.

codex, prompting, coding agents, responses api, agentic software engineering

Codex config reference

Reference · OpenAI · Intermediate

You need the current OpenAI reference for Codex configuration files before standardizing repo settings, approvals, models, or execution behavior.

codex, config, requirements.toml, config.toml, coding agents

OpenAI Codex SDK

SDK guide · OpenAI · Intermediate to advanced

You want the official TypeScript path for embedding Codex threads inside your own tools, CI jobs, or workflow apps instead of driving everything through the CLI.

openai, codex, sdk, typescript, coding agents

Use Codex in Slack

Integration guide · OpenAI · Intermediate

You want the official workflow for kicking off scoped Codex cloud tasks from Slack channels and threads after the current Slack integration rollout.

openai, codex, slack, cloud chats, coding agents

GPT-5.6: Frontier intelligence that scales with your ambition

Launch overview · OpenAI · Intermediate

You want OpenAI's July 9, 2026 GPT-5.6 launch page, including the July 30, 2026 pricing update for Luna and Terra, before relying on stale summaries of the Sol, Terra, and Luna family.

openai, gpt-5.6, frontier models, model selection, pricing