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Tools2026-08-28 · source-backed
The Workflow tool's script-writing reference moved into a bundled workflow-authoring skill that loads only when a workflow is being authored (Claude Code changelog). That's about 4.7k tokens reclaimed from every request in every session with the tool enabled. Reusable if you ship custom tools: a fat tool description is a per-turn tax, and a skill is the lazy alternative.
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Anthropic released Claude Fable 5.1 on September 1. Claude Code v2.1.257 made it the default Fable model at 17:53 UTC that day, with a 1M-token context window, $10 per million input tokens, $50 per million output, and $0.25 per million on cache reads (claude-code CHANGELOG). B...
If you've written Claude Code skills with context: fork in the frontmatter, go check them right now. As of the July 22 release, /code-review runs as a background subagent, and any skill declaring context: fork runs in the background by default (release notes). The opt-out is b...
The changelog shows --safe-mode (and CLAUDE_CODE_SAFE_MODE) boots with all CLAUDE.md, plugins, skills, hooks, and MCP servers disabled for clean troubleshooting, while /cd moves a session to a new directory without nuking the prompt cache mid-session. disableBundledSkills hide...
v2.1.218 took dangerous-rm, background-&, and suspicious-Windows-path checks out of permission dialogs, and stopped prompting in plan mode for Bash the static analyzer can't prove read-only. /deep-research also now starts only when you invoke it. Fewer interrupts, but a model...
Two things in one release, and only one of them is in the security section. CLAUDE_CODE_SUBAGENT_MODEL used to override the model for every subagent. In 2.1.251 it sets the default instead. An agent definition's model: frontmatter now wins, and so does an explicit per-spawn mo...
August 6: Sapiom raised $35M for a router that sends each model call to the cheapest capable model. August 7: Databricks published its internal cost playbook. August 8: Toolport hit Product Hunt with a free MCP gateway cutting tool-definition overhead 96%. Three parties, zero...
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