Claude Code
Everything you need to master Claude Code, Web & Desktop
Tools, MCPs, Skills, Extensions & Advanced Techniques
Claude Code cross-session messaging lets your sessions message each other. How ListAgents and SendMessage work, inbound controls, and the limits.
Claude Code cross-session messaging lets your sessions message each other. How ListAgents and SendMessage work, inbound controls, and the limits.
Your AI can now read all 180 Claude Fast posts over MCP. Included with every kit: one key, one command, the whole corpus.
Your AI can now read all 180 Claude Fast posts over MCP. Included with every kit: one key, one command, the whole corpus.
Connect Claude Code, Claude.ai, or Cursor to the Claude Fast blog MCP. Included with every kit: one key, one command, 180 posts.
Connect Claude Code, Claude.ai, or Cursor to the Claude Fast blog MCP. Included with every kit: one key, one command, 180 posts.
Eighteen agent definitions went from 8,798 lines to 664 and got better. What died: persona theater, THINK HARD, emoji. What survived, and why.
Eighteen agent definitions went from 8,798 lines to 664 and got better. What died: persona theater, THINK HARD, emoji. What survived, and why.
An agent that finished and one silently blocked look identical. The two delivery models, why self-reports are not evidence, and what to check.
An agent that finished and one silently blocked look identical. The two delivery models, why self-reports are not evidence, and what to check.
Claude got it wrong. Model problem or effort problem? The diagnostic that tells you which dial to turn, plus the effort field on every subagent.
Claude got it wrong. Model problem or effort problem? The diagnostic that tells you which dial to turn, plus the effort field on every subagent.
Anthropic cut 80% of Claude Code's system prompt. We ran the same surgery on a production framework: 8,798 agent lines to 664. Here is the diff.
Anthropic cut 80% of Claude Code's system prompt. We ran the same surgery on a production framework: 8,798 agent lines to 664. Here is the diff.
Every CLAUDE.md guide tells you what to add. After Claude 5, subtraction wins. The delete list, the one test per line, and what must never be cut.
Every CLAUDE.md guide tells you what to add. After Claude 5, subtraction wins. The delete list, the one test per line, and what must never be cut.
Exit code 2 blocks an agent and feeds it a correction. Building a real TeammateIdle gate exposed three loop-safety rules the docs do not carry.
Exit code 2 blocks an agent and feeds it a correction. Building a real TeammateIdle gate exposed three loop-safety rules the docs do not carry.
Fable 5 rewards a briefed outcome and punishes step-by-step prompting. Six practices for Claude Code, plus where Opus 5 still wins.
Fable 5 rewards a briefed outcome and punishes step-by-step prompting. Six practices for Claude Code, plus where Opus 5 still wins.
When Claude Code multi-agent orchestration saves money and when it adds a 60% markup for nothing. The coordination cost math, measured.
When Claude Code multi-agent orchestration saves money and when it adds a 60% markup for nothing. The coordination cost math, measured.
Claude Opus 5 vs Fable 5: Opus 5 wins nearly every eval at half the price. Where Fable 5 still leads, the retention gap, and which to pick.
Claude Opus 5 vs Fable 5: Opus 5 wins nearly every eval at half the price. Where Fable 5 still leads, the retention gap, and which to pick.
Claude Opus 5 benchmarks, pricing, and specs: $5/$25 unchanged from Opus 4.8, near-Fable 5 results, thinking on by default, and a new max effort.
Claude Opus 5 benchmarks, pricing, and specs: $5/$25 unchanged from Opus 4.8, near-Fable 5 results, thinking on by default, and a new max effort.
A hidden Claude Code subagent watches another agent and reports drift. Observer agents: the enable flag, the digest, and the ObserverReport tool.
A hidden Claude Code subagent watches another agent and reports drift. Observer agents: the enable flag, the digest, and the ObserverReport tool.
The Anthropic vs OpenAI race put frontier models in every ChatGPT and Claude tier. For moderate to heavy users, $100 on each lab beats $200 on one.
The Anthropic vs OpenAI race put frontier models in every ChatGPT and Claude tier. For moderate to heavy users, $100 on each lab beats $200 on one.
Claude Code runs four loop types: turn-based, goal-based, time-based, and proactive. What each means and how to set a real stop condition.
Claude Code runs four loop types: turn-based, goal-based, time-based, and proactive. What each means and how to set a real stop condition.
AdKit, Meta's official MCP, Pipeboard, Ryze, Composio compared: draft safety, pricing, OAuth, capabilities, and which to pick for what.
AdKit, Meta's official MCP, Pipeboard, Ryze, Composio compared: draft safety, pricing, OAuth, capabilities, and which to pick for what.
A second AI model that doesn't share Claude's blind spots catches more bugs than Claude reviewing itself. Here's how model stacking works.
A second AI model that doesn't share Claude's blind spots catches more bugs than Claude reviewing itself. Here's how model stacking works.
What Claude Code /compact keeps and loses, straight from Anthropic's docs. The full survival table plus how to make rules and skills persist.
What Claude Code /compact keeps and loses, straight from Anthropic's docs. The full survival table plus how to make rules and skills persist.
GLM 5.2 vs Opus 4.8 vs Sonnet 5: the only clean benchmark comparisons, why cross-vendor numbers mislead, pricing, open weights, and which to use.
GLM 5.2 vs Opus 4.8 vs Sonnet 5: the only clean benchmark comparisons, why cross-vendor numbers mislead, pricing, open weights, and which to use.
GLM 5.2 is Z.ai's open-weights MIT model: 753B MoE, 1M context, $1.40/$4.40 API. Benchmarks, self-host reality, and how it stacks up vs Claude.
GLM 5.2 is Z.ai's open-weights MIT model: 753B MoE, 1M context, $1.40/$4.40 API. Benchmarks, self-host reality, and how it stacks up vs Claude.
Sonnet 5 vs Opus 4.8 compared: Opus leads coding and reasoning by 0.5 to 6.6 points; Sonnet 5 ties knowledge work at ~40% less cost.
Sonnet 5 vs Opus 4.8 compared: Opus leads coding and reasoning by 0.5 to 6.6 points; Sonnet 5 ties knowledge work at ~40% less cost.
Claude Sonnet 5 scores 63.2% agentic coding at $2/$10 per million tokens (intro), closing the gap with Opus 4.8. Specs, benchmarks, pricing.
Claude Sonnet 5 scores 63.2% agentic coding at $2/$10 per million tokens (intro), closing the gap with Opus 4.8. Specs, benchmarks, pricing.
GPT-5.6 (Sol, Terra, Luna) is now generally available. Pricing, per-plan access, the launch-day reception, and how Sol compares to Claude.
GPT-5.6 (Sol, Terra, Luna) is now generally available. Pricing, per-plan access, the launch-day reception, and how Sol compares to Claude.