Field notes on shipping with AI tools

Practical write-ups from building and shipping with AI tools every day. No hype, no invented numbers, working examples.

• Claude Fable 5.2 in Claude Code: Alias, Effort, Fast Mode

  November 10, 2026

  Claude Code 2.1.321 adds Fable 5.2 and points the fable alias at it. What changes for saved Fable 5.1 picks, effort, fast mode pricing, and gateways.

• Claude Code Auto Mode: The Server Returned No Safety Verdict

  November 9, 2026

  Why Claude Code auto mode denies actions with "gave no verdict", what the ten-response stop means, and fixes for gateways, long chats and hooks.

• Claude Code MCP Tasks: Long Tool Calls in the Background

  November 8, 2026

  Since Claude Code 2.1.304 a long MCP tool call can run as a server-side task. When a call qualifies, how to make Claude wait instead, and what survives an exit.

• Claude Code Hooks: Bash Matchers and the Monitor Tool

  November 6, 2026

  Since Claude Code 2.1.314 a Bash-matcher hook also sees Monitor commands, but allow and updatedInput are ignored there. What it means for your policy hooks.

• Claude Code "Login expired" in Scheduled Runs: Fix It

  November 5, 2026

  Why an unattended Claude Code job fails with "Login expired", which credentials never hit it, and how to check expiry before it bites. Checked 2026-11-05.

• Install Claude Code on a Linux Server: apt, dnf, Pinning

  November 4, 2026

  Install Claude Code on a server with apt, dnf or apk, choose the stable or latest channel, stop surprise updates and pin versions. Checked 2026-11-04.

• Claude Code Fast Mode on Opus 4.8: Removal Date and Fix

  November 3, 2026

  Fast mode for Opus 4.8 is removed on November 30, 2026 and the API will reject requests. How to check what you run, switch to Opus 5.5, and what it costs.

• Claude Code: Block Reads Outside the Working Directory

  November 1, 2026

  How Claude Code permissions.blockReadsOutsideWorkingDirectories works: tools it fences, what Bash still does, which directories count, and the new writes key.

• Claude Code Hooks onFailure: Make a Broken Hook Block

  October 31, 2026

  A Claude Code policy hook that crashes, times out or prints bad JSON lets the action through. How onFailure block makes it fail closed, and what it skips.

• Claude Code Idle Compaction: What It Does and How to Stop It

  October 29, 2026

  Claude Code now compacts a long conversation you step away from, about 54 minutes in. When it fires, what skips it, what it saves, and how to turn it off.

• Claude Opus 5.5 in Claude Code: Defaults, Effort, and Cost

  September 23, 2026

  Claude Code 2.1.280 points the opus alias and the default model at Opus 5.5. Measured per-turn cost, the new medium effort default, and how to pin Opus 5.

• Claude Agent SDK SessionStore: Managed Postgres or Valkey

  September 22, 2026

  Managed Postgres or Valkey for a Claude Agent SDK SessionStore on DigitalOcean. Both reference adapters tested: stored bytes, connections, the eviction trap.

• Claude Code AGENTS.md: When It Loads and When It Doesn't

  September 20, 2026

  Claude Code reads AGENTS.md since 2.1.277, unless a CLAUDE.md sits above it or feature flags are off. Eight measured runs, plus the import that always works.

• Claude Code OpenTelemetry: Test the Export Locally First

  September 18, 2026

  What Claude Code sends over OpenTelemetry, measured with a 50-line OTLP receiver and ten headless runs: exit flush, redaction, three silent failure modes.

• Claude Code MCP Timeout in Headless Runs: 3 Knobs Measured

  September 17, 2026

  MCP_TIMEOUT, MCP_TOOL_TIMEOUT and the new CLAUDE_CODE_MCP_STARTUP_WAIT_MS explained and measured against a deliberately slow MCP server under claude -p.

• Claude Agent SDK SessionStore on DigitalOcean Spaces

  September 16, 2026

  Mirror Claude Agent SDK sessions to DigitalOcean Spaces with the reference S3 adapter: tested end to end, with the settings and per-session cost that follow.

• Claude Agent SDK Hosting: Droplet or App Platform?

  September 14, 2026

  Where to host a Claude Agent SDK app on DigitalOcean, a Droplet or App Platform, decided by the SDK's subprocess model, measured memory and disk, and price.

• Claude Code Plugin Eval: Test a Plugin Against a Baseline

  September 12, 2026

  How claude plugin eval works in Claude Code 2.1.269: the case files, six grader types, the no-plugin baseline delta, what a real run costs, and the CI gate.

• Claude Code Effort Levels: Cost, Caps, and maxEffortLevel

  September 11, 2026

  How Claude Code effort levels change token spend, which models support xhigh and max, where /effort saves, and how the new maxEffortLevel setting caps a team.

• Lovable vs Bolt vs v0: Pricing and Limits Compared

  September 10, 2026

  Lovable meters per-task credits, Bolt meters tokens, v0 meters dollars at model rates. Verified 2026 prices, free tiers, hosting, and which fits your app.

• CodeRabbit vs Claude Code Review: Cost and Coverage

  September 9, 2026

  CodeRabbit bills per developer, Anthropic's Code Review bills per review. The break-even math, what each one actually catches, and a cheaper middle path.

• Claude Code /skill-doctor: Find Unused Skills and Their Cost

  September 8, 2026

  What Claude Code /skill-doctor reports, why every installed skill costs context on each turn, the 1% listing budget, and how to prune with skillOverrides.

• Claude Code Without Permission Prompts: Unattended VPS Setup

  September 4, 2026

  How to run Claude Code unattended with --permission-prompts none, auto mode, and the Bash sandbox on a Linux VPS, plus a hardened settings file you can copy.

• Claude Cowork Skills: Port Your Claude Code SKILL.md Files

  September 3, 2026

  Claude Cowork does not read ~/.claude/skills. How to port a Claude Code SKILL.md into Cowork: six allowed frontmatter fields, the 200-character cap, ZIP shape.

• Claude Code Design Skill: Draft UI Artboards in the CLI

  September 2, 2026

  The Claude Code /design skill drafts editable UI artboards as an artifact. What it produces, the plan and version gates, and how to get code from it.

• Claude Code Self-Hosted Runners: Sizing and Cost Guide

  September 1, 2026

  What a Claude Code self-hosted runner needs: host requirements, per-session CPU and memory, the egress allowlist, and how many runners a team must run.

• Claude Code Status Line: Prompt Cache Fields

  August 31, 2026

  The prompt_cache object Claude Code v2.1.251 added to the status line JSON: all twelve fields, what warm and misses really mean, and two tested scripts.

• Claude Code PreModelSwitch Hook: Block or Confirm /model

  August 30, 2026

  How Claude Code's PreModelSwitch and PostModelSwitch hooks work: the input fields, allow/ask/deny decisions, matcher rules, and three tested example scripts.

• Claude Code Restricted Mode: What --restricted Blocks

  August 29, 2026

  What Claude Code's --restricted flag does: the tools it removes, the settings files it ignores, how to hand a tool back with --tools, and when to use it.

• Claude Code Credential Masking: Keep Secrets Out of Bash

  August 28, 2026

  How to keep API keys and tokens out of Claude Code's Bash sandbox: deny vs mask mode, the tlsTerminate requirement, and settings.json examples that work.

• Claude Code Prompt Caching: What Breaks It and the TTL Fix

  August 27, 2026

  How Claude Code prompt caching works, the eight actions that invalidate it, what a miss costs, and the new promptCacheTtl and subagentPromptCacheTtl settings.

• MCP Server Hosting: 4 Options Compared and Priced

  August 26, 2026

  Where to host a remote MCP server: Cloudflare Workers, Vercel, Fly.io, and DigitalOcean priced against what the current stateless spec revision actually needs.

• Claude Code Auto Mode: A Configuration Guide

  August 25, 2026

  Claude Code auto mode explained: the classifier's decision order, what it blocks by default, the autoMode settings block, and fixing Blocked by classifier.

• Cloudflare Kitesurf vs Chromium: What We Measured

  August 24, 2026

  We tested Cloudflare Kitesurf against the default Chromium path on Browser Run: billed browser time, SPA hydration, WebGL, and the actions it rejects.

• Claude Code Plugin Tutorial: Build One and Share It

  August 21, 2026

  A Claude Code plugin tutorial with the exact directory layout, plugin.json fields, a working skill, and the marketplace.json that lets a team install it.

• Claude Agent SDK vs Cline SDK: Which to Embed in 2026

  August 20, 2026

  Claude Agent SDK vs Cline SDK, checked against both projects' docs and npm: licensing, model lock-in, native binary vs pure TypeScript, and who wins.

• Run Claude Code on a Schedule: 3 Hosts Compared

  August 19, 2026

  How to run Claude Code unattended on a schedule: the headless flags that survive cron, and GitHub Actions vs a VPS vs your own machine compared.

• Lovable vs Claude Code: Which Builds Your App in 2026?

  August 18, 2026

  Lovable and Claude Code solve different problems. A verified 2026 comparison: pricing, generated stack, code ownership, and when to use each one.

• How to Charge for an MCP Server: Two Billing Rails

  August 17, 2026

  How to charge for an MCP server: prepaid credits through Stripe, or per-call x402. What the MCP spec says about payments, and the money bugs that bite.

• Web Page to Markdown API: 6 Options Compared (2026)

  August 16, 2026

  We priced six ways to turn a URL into markdown or JSON for an LLM, then ran structured extraction against 12 real pages to see which fields actually fill.

• OG Image API Comparison: Price and What Renders

  August 15, 2026

  We priced six ways to generate Open Graph images and pixel-tested a live endpoint: which CSS lays out, whether linked fonts apply, and whether emoji render.

• HTML to PDF API Comparison: Price and Print CSS

  August 14, 2026

  We priced seven HTML to PDF options per document, ran live requests against ours, and tested which print CSS features headless Chromium actually honors.

• Screenshot API or Self-Hosted Droplet: Real Costs in 2026

  August 13, 2026

  Real 2026 cost math: our screenshot render API versus running headless Chrome on a DigitalOcean droplet, at three volumes from 100 to 50,000 renders a day.

• Screenshot APIs Without a Subscription, Compared (2026)

  August 13, 2026

  Three ways to get a screenshot API without a monthly plan: prepaid credits, usage units, and building on Cloudflare, with pricing verified in 2026.

• Claude Code Hooks: A Practical Guide

  August 12, 2026

  A practical guide to Claude Code hooks. The events worth knowing, exit code semantics, matcher syntax, and working examples you can copy into settings.json.

• An AI Client Onboarding Workflow for Freelancers

  August 10, 2026

  A practical AI workflow for freelancer client onboarding. Six steps from intake form to kickoff, with copy-paste prompts and clear human checkpoints.

• Claude Code Skills Tutorial: Write Your First SKILL.md

  August 10, 2026

  A hands-on Claude Code skills tutorial. Where skill files live, which frontmatter fields matter, and a complete working SKILL.md you can copy today.

• Claude Code Subagents: A Practical Guide

  August 10, 2026

  A practical guide to Claude Code subagents. Where agent files live, every frontmatter field that matters, delegation, and a working example agent.

• CLAUDE.md Best Practices: What to Put In, What to Leave Out

  August 10, 2026

  CLAUDE.md best practices from daily use. File locations and precedence, the under-200-line rule, import syntax, and what belongs in a skill instead.