Performance Good First Issues

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Performance

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Difficoltà media annotata: 4.1/5 su 965 issue.
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[BUG] Warm prompt cache fully re-written (cache_read collapses to system+tools floor) seconds after ToolSearch / Skill / tool_result on v2.1.258 — 4 events with request IDs; plus pre-2.1.257 screenshot size-cap data Aperta

area:core area:cost bug has repro platform:macos

anthropics/claude-code#91514 · 3 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Emit --append-system-prompt as its own system block so a changed append does not invalidate the preset Aperta

area:core area:cost enhancement

anthropics/claude-code#91518 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Startup FileIndex blocks the event loop for ~41s when cwd is a large non-git directory (home dir, ~65k files) Aperta

area:core bug has repro platform:linux

anthropics/claude-code#91633 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Recursive FileChanged watchPaths registration over a large NFS directory blocks the main thread at startup (D state, rpc_wait_bit_killable) Aperta

area:hooks bug has repro platform:linux

anthropics/claude-code#91634 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Context window balloons at fresh-session start (~40-70K baseline tokens) and full-file re-injection on every auto-compact Aperta

area:core area:mcp bug platform:macos

anthropics/claude-code#91689 · 3 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] A persisting `cd` in a Bash tool call re-resolves project context and rewrites the system prompt, invalidating the entire prompt cache (5 captures, ~580k tokens each) Aperta

area:bash area:core area:cost bug has repro platform:macos

anthropics/claude-code#91706 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Turn-boundary prompt-cache misses on Fable 5.1 / Claude 5: 7% → 29% between 2.1.224 and 2.1.252, mechanism captured, fixed in 2.1.259 — with two residuals and one default worth changing Aperta

area:core area:cost area:hooks area:plugins bug has repro platform:macos

anthropics/claude-code#91707 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[FEATURE] Add token usage warnings for potentially inefficient solution paths (aka: falling down rabbit-holes) Aperta

area:core area:cost enhancement

anthropics/claude-code#91726 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Major Bug] 30% session exhausted in 2 seconds. Issue happening after the latest claude update(on fable 5.1 launch) Also Compaction invalidates cache on session resume, breaking cache efficiency Aperta

area:core area:cost bug platform:windows

anthropics/claude-code#91858 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Scheduled-task runs leak a resident claude process per fire (2.1.255, Linux): 106 procs / 26 GB in 25 h — regression of #54626 Aperta

area:core area:mcp bug has repro perf:memory platform:linux regression

anthropics/claude-code#91879 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Prompt cache never hits across chained -p --resume calls, even at minimum config Aperta

area:core area:cost bug has repro platform:macos

anthropics/claude-code#91971 · 5 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Mid-conversation tool/MCP list changes silently invalidate prompt cache, causing repeated full-price rewrites within minutes Aperta

area:core area:cost bug

anthropics/claude-code#92033 · 4 commenti · 2 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Desktop (macOS): background full checkout of pooled worktrees is unthrottled — 3 concurrent on an 82k-file repo take 11-13 min each (24 s median), git status times out, pool grows to 72 GB Aperta

area:desktop bug has repro performance platform:macos

anthropics/claude-code#92078 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Desktop app: local-agent-mode task sandboxes (~300MB each) never get cleaned up, disk fills up daily Aperta

area:cowork area:desktop area:sandbox bug has repro platform:macos

anthropics/claude-code#92158 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Sessions freeze intermittently without error output Aperta

area:tui bug platform:macos

anthropics/claude-code#92222 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Background task kill/completion notification wakes the session and re-reads full context -- costs a full turn with no user input Aperta

area:core area:cost enhancement platform:windows

anthropics/claude-code#92283 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Desktop: stalls over 5s are discarded as "[likely sleep: duration_heuristic]" and dropped from the app's own counters — 91/1129 samples, zero sleep events in Windows' power log Aperta

area:desktop bug has repro platform:windows

anthropics/claude-code#92325 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] 2.1.261 macOS arm64: session hangs, main thread 100% CPU in JIT loop while waiting on a background subagent (sample attached) Aperta

area:agents area:core bug duplicate perf:cpu platform:macos

anthropics/claude-code#92393 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Excessive unused memory allocation causing OOM when vm.overcommit_memory=2 Aperta

bug perf:memory platform:linux

anthropics/claude-code#92422 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Feature Request] Optimize token usage for simple code changes with well-documented context Aperta

area:cost enhancement platform:vscode platform:windows

anthropics/claude-code#92486 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Fable 5.1 excessive token consumption on low-effort tasks Aperta

area:cost area:model bug platform:macos

anthropics/claude-code#92499 · 0 commenti · 1 reazione · 0 assegnatari · Indicizzata il 14/9/2026
Per-session scratchpad UUID in the system prompt is the only cross-session prompt diff, invalidating the cached prefix on every new session Aperta

area:core area:cost bug has repro platform:macos

anthropics/claude-code#92524 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Allowlist-based tool selection to cap context overhead as built-in tools grow (alt. to #66073 / #54716) Aperta

area:cost area:tools enhancement

anthropics/claude-code#92554 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Cowork VM orphaned across sessions (4 GB, macOS) — three kernel panics, logs attached Aperta

area:cowork area:desktop bug has repro perf:memory platform:macos

anthropics/claude-code#92714 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Claude Desktop for Mac freezes every 7-10 minutes (EventEmitter listener leak) Aperta

invalid

anthropics/claude-code#92785 · 1 commento · 2 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Desktop app: multi-agent Workflow run white-screens the app and starves an 8 GB machine; in-flight subagent work is lost Aperta

area:agents area:desktop bug perf:memory platform:macos

anthropics/claude-code#92829 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
WSL2 repeatedly OOM-crashes (systemd killed) during multi-project Claude Code workflow/skill-generation task Aperta

area:agents area:plugins bug perf:memory platform:wsl

anthropics/claude-code#92838 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Native Windows: startup waits ~4.5 s on three embedded-ripgrep calls that each re-launch claude.exe; agent-view sessions take ~10 s to open (USE_BUILTIN_RIPGREP=0 halves it) Aperta

bug has repro performance platform:windows regression

anthropics/claude-code#92847 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Each sandboxed Bash tool call blocks the event loop ~8.4s (fixed cost, independent of command); terminal input freezes for the duration Aperta

area:core bug has repro perf:memory platform:linux

anthropics/claude-code#92896 · 2 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Prompt cache for resumed session history intermittently fails to hit on `resume`, independent of idle time or TTL Aperta

area:agent-sdk area:core area:cost duplicate platform:windows

anthropics/claude-code#92938 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Feature Request] Improve browser and UI interaction performance Aperta

area:tui duplicate platform:macos platform:vscode

anthropics/claude-code#93020 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Desktop app (Windows): Electron main process pins a full CPU core during agent work — whole app freezes; reproduces across 1.32885 and 1.49585 Aperta

area:desktop bug has repro performance platform:windows

anthropics/claude-code#93121 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Desktop (Windows): clicking a session in the sidebar spawns its full CLI + MCP + shell stack, even for archived sessions; browsing 10 sessions ≈ 8 GB / 20+ python processes for 15–30 min Aperta

area:desktop bug has repro perf:memory platform:windows

anthropics/claude-code#93150 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Desktop (Windows): shell PTYs started on session warm are not stopped when the session is paused by idle timeout; preview lifecycle opens a second PTY per session Aperta

area:desktop bug has repro platform:windows

anthropics/claude-code#93151 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Windows: peer-session liveness probe (powershell + Get-CimInstance Win32_Process, 1 s timeout) leaves unkillable orphan processes -> commit exhaustion -> crash 0xC0000409 Aperta

area:core bug has repro platform:windows

anthropics/claude-code#93274 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Browser pane detached to separate window is slow/visually corrupted — regression in 1.49585.0 Aperta

area:desktop bug has repro platform:linux regression

anthropics/claude-code#93298 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Windows: ~5s event-loop stall on first Enter after idle — working-set trim causes 41k major page faults (duplicate message submission) Aperta

area:tui bug has repro platform:windows

anthropics/claude-code#93372 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] macOS Desktop: worktreeDepSeed's 680k-file clonefile starves a synchronous main-thread rename(2) — deterministic ~30 s whole-app freeze per new worktree session, discarded as "likely sleep" Aperta

area:desktop bug has repro platform:macos regression

anthropics/claude-code#93382 · 1 commento · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Disproportionate cache read token consumption in plan mode with clean sessions Aperta

area:cost bug

anthropics/claude-code#93424 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Excessive latency or context length issues with single command processing Aperta

area:tui duplicate platform:windows

anthropics/claude-code#93432 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] --resume never hits the prompt cache past the static prefix on Fable 5.1 (opus hits): session-start context message is replayed as a plain string instead of the content blocks it was sent with Aperta

area:core area:cost bug has repro performance platform:macos

anthropics/claude-code#93490 · 4 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[FEATURE] Cache CLAUDE.md and rules across sessions: they are re-written to the prompt cache at every session start Aperta

area:core area:cost enhancement

anthropics/claude-code#93499 · 1 commento · 1 reazione · 0 assegnatari · Indicizzata il 14/9/2026
[Bug] Performance degradation in Claude Code over past three days Aperta

area:model bug platform:linux

anthropics/claude-code#93513 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[FEATURE] Persistent project-scoped prompt cache, independent of thread/session lifetime Aperta

area:cost enhancement

anthropics/claude-code#93572 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Channel messages are merged into the previous user message and re-rendered on the next request, losing the prompt cache on non-Anthropic backends Aperta

area:cost area:plugins bug platform:wsl

anthropics/claude-code#93622 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Design window renderer grows unbounded during generation and is killed at 2-4GB (macOS, Apple Silicon) Aperta

area:desktop bug has repro perf:memory platform:macos

anthropics/claude-code#93679 · 12 commenti · 1 reazione · 0 assegnatari · Indicizzata il 14/9/2026
[FEATURE] Background compaction: keep the session running while the summary is produced Aperta

area:core enhancement performance

anthropics/claude-code#93732 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
[BUG] Windows Desktop: main session process CPU spikes to 600–900%+ for ~2s during response streaming, coinciding with event-loop stalls up to 17s Aperta

area:desktop bug has repro performance platform:windows

anthropics/claude-code#93811 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Claude Code Desktop: WindowServer at ~47% CPU while a response streams (deep CoreAnimation layer tree re-walked at 120 Hz) Aperta

area:desktop bug has repro performance platform:macos

anthropics/claude-code#94003 · 0 commenti · 0 reazioni · 0 assegnatari · Indicizzata il 14/9/2026
Desktop app spawns a full-disk `find` that triggers repeated "access data from other apps" (TCC) prompts Aperta

area:desktop bug has repro platform:macos

anthropics/claude-code#94064 · 0 commenti · 1 reazione · 0 assegnatari · Indicizzata il 14/9/2026

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