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upstream: official claude code updates 2026-05-19 #145

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7 changes: 7 additions & 0 deletions docs/cost.md
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Expand Up @@ -28,6 +28,13 @@ monitor is now a stable feature (v2.1.98+) and is the preferred method for long-

that $200 covers everything. hundreds of sessions, thousands of subagent spawns. run `/lore` to see your own numbers.




### background sessions (v2.1.144+)

background sessions started via `claude --bg` now support `/resume`, allowing you to check on agent progress without interrupting. background subagent completion notifications now show elapsed time (e.g. "Agent completed · 3h 2m 5s"). background sessions still count against your monthly budget; use them for long-running agents where you don't need real-time interaction.

### what your plan costs

| plan | monthly | how billing works |
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7 changes: 7 additions & 0 deletions docs/hooks.md
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Expand Up @@ -53,6 +53,13 @@ PreToolUse hooks (safety-guard, no-squash) fire on every Bash call -- 10K+ times






### note on background sessions and hooks (v2.1.144+)

hooks fire normally in background sessions. PreToolUse hooks will continue to block dangerous commands even when agents run in the background. SessionEnd hooks fire when the background session completes.

### hook performance notes (v2.1.140+)
PreToolUse hooks on Bash commands need to complete in <50ms to avoid user-facing latency. the hooks listed above are optimized for speed -- they use jq for JSON parsing and regex for pattern matching rather than spawning subprocesses. profile your custom hooks with `time` if you add new ones.

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4 changes: 4 additions & 0 deletions docs/tips/README.md
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Expand Up @@ -23,3 +23,7 @@ short, standalone claude code tips. each one is a specific technique you can use
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| [monitor](./monitor.md) | watch background processes, react to output in real time (v2.1.98+, stable as of v2.1.140) |

---

| [background sessions](./background-sessions.md) | run agents in the background, resume later, track elapsed time (v2.1.144+) |
7 changes: 7 additions & 0 deletions docs/tips/fast-mode.md
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Expand Up @@ -8,6 +8,13 @@ fast mode keeps you on opus. it does not switch to a cheaper or smaller model. w

this is the most common misconception i see. people assume fast mode = dumber model. it's not. it's the same opus with a tighter thinking budget.




### note on model defaults (v2.1.144+)

`/model` now changes the model for the current session only. to set a default model for all new sessions, press `d` in the model picker. this means you can switch models mid-session without affecting future sessions.

## why i don't use it

never use fast mode. i mean it. the only scenario where fast mode makes sense is if you're at a hackathon with 30 minutes left before demo, or you're someone who literally doesn't care about burning through usage. fast mode can easily run up over a hundred dollars of usage in half an hour.
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