fix: pass prompt via stdin to avoid E2BIG error#12
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kevinfealey wants to merge 1 commit intoatalovesyou:mainfrom
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fix: pass prompt via stdin to avoid E2BIG error#12kevinfealey wants to merge 1 commit intoatalovesyou:mainfrom
kevinfealey wants to merge 1 commit intoatalovesyou:mainfrom
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Large prompts (e.g., with conversation history) can exceed the OS argument size limit (ARG_MAX), causing spawn() to fail with E2BIG. This change passes the prompt via stdin instead of as a CLI argument, which has no size limitation.
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smartchainark
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Feb 10, 2026
Large prompts (conversation history + system prompt) can exceed the OS argument size limit, causing spawn() to fail with E2BIG. Passing via stdin has no size limitation. Credit: PR atalovesyou#12 by @kevinfealey Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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bwiedmann
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Feb 15, 2026
… E2BIG error # Conflicts: # src/subprocess/manager.ts
wende
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Feb 18, 2026
Triaged all 14 open PRs from atalovesyou/claude-max-api-proxy, implemented the valuable fixes, and added end-to-end test coverage. Changes: - Fix normalizeModelName crash on undefined model (atalovesyou#7 regression) - Pass prompt via stdin instead of CLI arg to avoid E2BIG (atalovesyou#12) - Increase subprocess timeout from 5 to 15 minutes (atalovesyou#20) - Add Claude 4.5/4.6 model IDs and claude-max/ prefix (atalovesyou#10, atalovesyou#20) - Include usage data in final streaming SSE chunk (atalovesyou#16) - Wrap subprocess logging with DEBUG_SUBPROCESS env check (atalovesyou#5, atalovesyou#16) - Strip CLAUDECODE env var from subprocesses (own fix) - Add e2e test suite (7 tests covering health, models, completions)
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wende
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Feb 18, 2026
Triaged all 14 open PRs from atalovesyou/claude-max-api-proxy, implemented the valuable fixes, and added end-to-end test coverage. Changes: - Fix normalizeModelName crash on undefined model (atalovesyou#7 regression) - Pass prompt via stdin instead of CLI arg to avoid E2BIG (atalovesyou#12) - Increase subprocess timeout from 5 to 15 minutes (atalovesyou#20) - Add Claude 4.5/4.6 model IDs and claude-max/ prefix (atalovesyou#10, atalovesyou#20) - Include usage data in final streaming SSE chunk (atalovesyou#16) - Wrap subprocess logging with DEBUG_SUBPROCESS env check (atalovesyou#5, atalovesyou#16) - Strip CLAUDECODE env var from subprocesses (own fix) - Add e2e test suite (7 tests covering health, models, completions) Co-Authored-By: kevinfealey <10552286+kevinfealey@users.noreply.github.com> Co-Authored-By: Max <257223904+Max-shipper@users.noreply.github.com> Co-Authored-By: James Hansen <1359077+jamshehan@users.noreply.github.com> Co-Authored-By: bitking <213560776+smartchainark@users.noreply.github.com> Co-Authored-By: Alex Rudloff's AI Agents <258647843+alexrudloffBot@users.noreply.github.com>
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Feb 20, 2026
Fixes applied (from upstream PRs atalovesyou#7, atalovesyou#11, atalovesyou#12, atalovesyou#13, atalovesyou#17, atalovesyou#20): - fix: normalizeModelName crash on undefined model (issue atalovesyou#21) - fix: [object Object] serialization for array content parts - fix: E2BIG error by passing prompt via stdin instead of CLI arg - fix: ensureString on result.result to prevent non-string output - feat: CLAUDE_DANGEROUSLY_SKIP_PERMISSIONS env var for headless mode - feat: OPENCLAW_PROXY=1 env injection for hook isolation - feat: model aliases for claude-*-4-5, claude-*-4-6 generations - feat: claude-proxy/ provider prefix support - feat: developer role support in message conversion - perf: increase subprocess timeout from 5min to 15min Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
chrisle
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Feb 27, 2026
Users can now send large prompts without E2BIG errors, use array-based content format for multimodal support, properly handle system prompts, and receive token usage data in streaming responses. Model names with any provider prefix are now correctly normalized. Changes: - Fix array content serialization preventing [object Object] bugs - Pass prompts via stdin to prevent E2BIG errors with large requests - Add proper system prompt support via --append-system-prompt flag - Include usage data in final streaming chunks - Support any provider prefix in model names (claude-max/, etc.) - Add CLAUDE_DANGEROUSLY_SKIP_PERMISSIONS env var for service mode - Update to Claude 4.5/4.6 model support Incorporates improvements from PRs atalovesyou#12, atalovesyou#13, atalovesyou#16, atalovesyou#24, atalovesyou#27 at https://github.com/atalovesyou/claude-max-api-proxy
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Problem
Large prompts (e.g., with conversation history, system prompts, or multi-modal content) can exceed the OS argument size limit (ARG_MAX, typically 128KB-2MB on Linux), causing
spawn()to fail with:Solution
Pass the prompt via stdin instead of as a CLI argument. stdin has no size limitation, making the proxy work reliably regardless of prompt size.
Changes
buildArgs()