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CodeTracked since May 19, 2026

Defer MCP dependency warmup to background startup task

The PR changes MCP startup sequencing so `start.mjs` loads `server.bundle.mjs` and becomes ready before `hooks/ensure-deps.mjs` runs, preventing slow optional dependency repair work from blocking readiness; it also adds a regression test for delayed warmup behavior.

start.mjsserver.bundle.mjshooks/ensure-deps.mjsMCP startup

What Happened

  • The PR changes MCP startup sequencing so `start.mjs` loads `server.bundle.mjs` and becomes ready before `hooks/ensure-deps.mjs` runs, preventing slow optional dependency repair work from blocking readiness; it also adds a regression test for delayed warmup behavior.
  • The PR changes MCP startup sequencing so `start.mjs` loads `server.bundle.mjs` and becomes ready before `hooks/ensure-deps.mjs` runs, preventing slow optional dependency repair work from blocking readiness; it also adds a regression test for delayed warmup behavior.
  • 1 evidence item attached for review.

What is Different

Before

Scattered source updates, isolated context, and manual follow-up across multiple feeds.

Now

Enabled asynchronous startup behavior by executing dependency warmup and optional dependency repair off the critical path, preserving best-effort repair while guaranteeing the MCP bundle can initialize and respond within startup budget.

Why Track This

Why It Matters

MCP operators using context-mode should see faster, more predictable startup completion because client readiness is no longer blocked by slow dependency warmup, reducing timeout failures in environments with slow installs or filesystems. The mechanism now delays optional repair work to a detached Node process after bundle import/stdio readiness, so startup responsiveness improves for latency-sensitive clients. Watch for whether repair failures surface clearly in logs and whether delayed repair introduces runtime dependency failures later in a session.

Impact

MCP operators using context-mode should see faster, more predictable startup completion because client readiness is no longer blocked by slow dependency warmup, reducing timeout failures in environments with slow installs or filesystems. The mechanism now delays optional repair work to a detached Node process after bundle import/stdio readiness, so startup responsiveness improves for latency-sensitive clients. Watch for whether repair failures surface clearly in logs and whether delayed repair introduces runtime dependency failures later in a session.

What To Watch Next

  • Watch whether start.mjs becomes a repeated pattern.
  • Track follow-up changes around Model Context Protocol.
  • Compare future signals against this evidence trail.
  • Re-check risk flags: background_dependency_repair_errors_hard_to_detect, latent_dependency_issues_after_startup.
Open Topic TimelineOpen Technical EventOpen Original Sourcebackground_dependency_repair_errors_hard_to_detect / latent_dependency_issues_after_startup / startup_test_coverage_drift / background_repair_cpu_or_io_spike

Supporting Evidence

GITHUB PULL REQUESTHigh Trust

mksglu/context-mode PR #633: [codex] Avoid blocking MCP startup on dependency warmup

Move dependency warmup out of MCP startup critical path and keep best-effort repair in detached background process.