CC 2.1.128/129 Adoption — Group E: OTEL / MCP / SDK

Issues closed 9 → 6 effective sections

What changes

1. OTEL subprocess env isolation breaking

# Shell
export OTEL_EXPORTER_OTLP_ENDPOINT=http://otel:4318
claude

# Inside session, Bash tool runs:
python -m my_app
  ↑ inherits OTEL_*, spans land in
    CLI's collector under
    service.name=claude-code (wrong)

# Shell — same setup
export OTEL_EXPORTER_OTLP_ENDPOINT=http://otel:4318
claude

# Inside session, Bash tool runs:
python -m my_app
  ↑ OTEL_* stripped, no spans emitted
    unless explicitly set per-invocation:

OTEL_EXPORTER_OTLP_ENDPOINT=http://otel:4318 \
OTEL_SERVICE_NAME=my-app \
  python -m my_app

Affected children: Bash, hooks, MCP servers (stdio + Streamable HTTP), LSP. For MCP, set OTEL env in .mcp.json's env block instead of relying on shell inheritance.

2. MCP reconnect tool summarization breaking

mcp__github__create_issue re-registered
mcp__github__create_pull_request re-registered
mcp__github__list_repositories re-registered
... (37 lines per reconnect)

mcp__github__* (37 tools re-registered)

# Audit-log diff: use initial connect
# event as source of truth; reconnect
# summaries are deltas only.

3. SDK host "Always allow" persistence new_perm

# SDK host Bash permission prompt → user picks "Always allow"
# CC 2.1.128 writes to .claude/settings.local.json (per-user, gitignored)
{
  "permissions": {
    "allow": ["Bash(npm run lint)"]
  }
}
# .claude/settings.json stays unchanged. Audit your SDK consumers'
# .gitignore — committing settings.local.json leaks per-dev grants.

4. --channels with console auth new_perm

# Console (API key) auth orgs with managed settings:
# /etc/claude-code/managed-settings.json
{
  "channelsEnabled": true
}
# Without this, --channels no-ops with "channels disabled by managed policy"

5. Gateway /v1/models discovery breaking

# 2.1.126–2.1.128: automatic
# 2.1.129+: opt-in
export CLAUDE_CODE_ENABLE_GATEWAY_MODEL_DISCOVERY=1
claude  # custom gateway models now visible in /model picker

6. claude_code.pull_request.count includes MCP new_event

# Before 2.1.129: counted only Bash-tool PRs (gh pr create, glab mr create)
# After 2.1.129: also counts MCP-filed PRs (mcp__github__create_pull_request, …)
# Dashboards see step-function increase at cutover. Annotate, don't alert.

Files changed doc-only

M131 group plan

• ✅ A · Foundation — 4 doc additions (PR #1672 merged)
• ✅ B · MCP hygiene — 5 features + manifest restructure (PR #1674 merged)
• ✅ D · Config / permission — introduced parent CC 2.1.128/129 headers (PR #1686 merged)
• ⏳ C · OAuth/scope/perm — runs in parallel with E
• E · OTEL / MCP / SDK (this PR) — 9 issues / 6 effective sections — all hang under D's parent headers

Verification

• npm run build — plugins/ regenerated, no count drift
• npm run test:skills
• npm run test:agents
• npm run test:manifests
• npm run test:security
• npm run typecheck