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* docs(spec): design for #47 SSE heartbeat on streaming path Draft spec for an opt-in idle-watchdog SSE heartbeat covering both pre-first-byte and mid-stream silent windows. Default disabled, controlled by CLAUDE_HEARTBEAT_INTERVAL. Targets ~40 LOC. Decisions captured: D1 whole-stream reset-on-byte; D2 SSE comment frame; D3 default disabled; D4 relocate ensureHeaders() to post-spawn; D5 X-Accel-Buffering: no on both SSE header sites; D6 single log line per affected request. Scope-locked: does not touch CLAUDE_TIMEOUT semantics, the separate server.mjs:480-489 dangling-client bug, issues #41/#42, or the non-streaming path. Includes privacy preflight and cloud-testing plan per maintainer feedback. Refs: #47 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * docs(plan): implementation plan for #47 SSE heartbeat 6 phases: pre-work (file 480-bug), implementation (5 tasks on feat/47-sse-heartbeat), opus fresh-context review, cloud verification on Mac rig, privacy preflight, PR+release. Each implementation task carries concrete code, syntax check, and a scoped commit message. LOC budget enforced in Task 1.6 gate (~45 server.mjs lines max). Reviewer checklist scopes scope-lock, ALIGNMENT, privacy, and heartbeat-cannot-abort discipline. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(server): add startHeartbeat helper + HEARTBEAT_INTERVAL env var Per design doc (refs #47). Helper is a per-request idle watchdog that emits `: keepalive\n\n` SSE comment frames; returns a {reset, stop} handle. No wiring yet — helper is unused, safe to commit in isolation. cli.js citation: N/A — SSE response shaping is an OCP-owned translation layer, not a cli.js operation. See AGENTS.md and ALIGNMENT.md Rule 2. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(server): eagerly send SSE headers post-spawn (D4, refs #47) Moves the ensureHeaders() call from "on first stdout byte" to "immediately after successful spawn." This is a prerequisite for the heartbeat covering the pre-first-byte silent window (the 'processing large contexts' failure mode in #47). Behavioral consequence: the narrow "spawn succeeded but subprocess died before any byte" branch at server.mjs:610-611 becomes effectively dead in the common case. The post-headers SSE-stop path (612-619) handles it instead. The branch remains defensively for the client-closed-before- ensureHeaders race. Isolated commit per design doc §D4 so reviewer can focus on this one behavior change. cli.js citation: N/A — SSE header emission is OCP response-shaping. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(server): wire heartbeat into streaming path (refs #47) - sendSSE() accepts optional hb handle and calls hb.reset() before write - callClaudeStreaming starts heartbeat after ensureHeaders() and passes hb to the three streaming sendSSE call sites - All three exit paths (proc close, proc error, res close) call hb.stop() to guarantee timer cleanup; no-op handle when disabled means zero runtime cost when CLAUDE_HEARTBEAT_INTERVAL=0 Heartbeat never aborts — only writes comment frames and re-arms. Aligns with v3.3 timeout discipline (single CLAUDE_TIMEOUT, no secondary client-killing timers). cli.js citation: N/A — SSE response shaping is OCP translation layer. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * feat(server): add X-Accel-Buffering: no to SSE response headers (refs #47) nginx (and many LBs / Cloudflare) default to proxy_buffering=on, which would buffer heartbeat comment frames indefinitely and defeat the feature silently. This header hints no-buffering; other stacks ignore it. Applied at both SSE header sites (real streaming + cache-hit). cli.js citation: N/A — response header shaping is OCP translation layer. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * chore(release): v3.12.0 — streaming heartbeat (refs #47) Bundles the release-kit companion files per Iron Rule 5.2 / 11 example: version bump across package.json + ocp-plugin + openclaw.plugin.json, CHANGELOG v3.12.0 section, README env var row + "Streaming heartbeat" explainer. Tag push to v3.12.0 triggers .github/workflows/release.yml to create the GitHub Release automatically. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * fix(server): ensureHeaders returns true when already sent (refs #47) Phase 3 smoke test revealed every content chunk was being dropped after the D4 eager ensureHeaders() call: the stdout.on('data') guard `if (!ensureHeaders()) return;` early-returned on every chunk because ensureHeaders returned false for the already-sent case (conflated with the dead-connection case). Split the two conditions explicitly: return false only when res is ended/destroyed; return true when headers are (already or now) sent. This also fixes a latent multi-chunk bug on main that was masked because claude CLI typically outputs in one stdout chunk. Verified: node -c server.mjs; subsequent re-run of Phase 3 smoke test now sees streaming content chunks + heartbeat frames. cli.js citation: N/A — SSE response shaping is OCP translation layer. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>