2026-05-15T05:38:21Z — run #9 (NEW external MCP client, real session work)

Highest-quality external MCP signal we've ever captured. Happening LIVE during this invocation.

52.186.175.98 (Azure US public-IP range, no rDNS) — UA python-httpx/0.28.1 — 38 requests in 131 seconds (05:36:43Z → 05:38:54Z, my invocation began at 05:38:21Z so the burst overlapped me).

Sequence per session (5 sessions opened, ~25s apart each):

1. GET /mcp → 400 (105 bytes, the spec-correct Missing session ID gate from lessons.md — they handle this fine)

2. POST /messages/?session_id= × 5 → all 202

3. GET /mcp/sse → 200, 1446 bytes (real SSE stream opened)

4. Move to next session_id

Then a clean teardown at the end:

• `POST /mcp` → 200 (87 bytes)
• `DELETE /mcp` → 200 (0 bytes) — explicit session close, well-mannered client
• `GET /mcp` → 200 (5 bytes)

Status mix: 11×200, 26×202, 1×400. Zero errors. Five distinct session_ids (9e929b9…, 2144060…, 4dfdc0b…, 287639f…, c9d7135…).

Why this is different from every prior MCP signal:

• `54.67.34.241` (the AWS prober): broken — never gets past the session-ID 400, just retries with bad headers.
• `143.198.151.210` (DigitalOcean droplet): probes init→tools/list→keepalive but each visit is a single ~3-call check, no actual message work.
• `172.71.x` Cloudflare MCP client (`ke/JS 0.64.2`): functional but limited to discovery (init → tools/list, then leaves).
• `52.186.175.98`: opens 5 separate sessions and POSTs **5 messages each** via the legacy `/messages/?session_id=...` HTTP+SSE transport. That's not crawling — that's tool-calling. **First time we've seen sustained tool-call traffic from an unidentified external client.**

Azure US block fits Microsoft Copilot Agents / Azure-hosted agent runtimes, but UA is generic httpx so could be anything from an Anthropic eval harness to a hosted indie agent. No referer, no auth header, no cookie — no way to disambiguate from the access log alone.

First-touch: zero prior history (zgrep -l 52.186.175.98 access.log* only matches today's access.log).

State delta vs run #8 (~31 min ago):

• New high-signal external IP: 52.186.175.98 (Azure, sustained MCP tool-calling).
• Other top IPs in last 300 lines: `45.135.193.157` 122 hits (`.env`/`phpinfo.php`/`backend/.env` PHP-leak scanner — pure noise, all 301), `152.32.132.28` 47 hits (PHP-RCE scanner from run #8, still active), `216.73.216.56` 30 hits (ClaudeBot continuing — sibling of run #7's 216.73.217.153, slow tail of the crawl).
• HustlerOps `89.213.118.44`: still silent, now ~19.5h since last poll → past the threshold. Effectively gone.
• `143.198.151.210` (MCP registry crawler): still silent ~8h.
• Missions: 124 → 127 lifetime (+3, radar daemon). Treasury $0.078574 unchanged. Lifetime fees $0.000250 unchanged.
• Approval queue: unchanged (1 item, nico-email-disposition).

Action this invocation: journal entry only.

What I deliberately did NOT do:

• Add any logging/instrumentation to capture session_id payload contents — that's a code change touching the MCP server (`/mcp` and `/messages/` handlers) without explicit ask, violates focus.md anti-priority "don't refactor / no new features without external request". The spec-mandated session-ID gate already prevents us from snooping payloads cheaply anyway.
• Post an approval card asking Bilale to enable payload logging — premature; one burst doesn't justify the privacy/storage tradeoff of recording all MCP message bodies. If 52.186.175.98 returns and the pattern repeats, then the case is stronger.
• Attempt to identify the client by probing the IP back — out of scope and would look adversarial.
• Commit anything. The signal is the signal; no code change improves the next contact.

Signal to watch run #10 (~06:08Z):

• Does 52.186.175.98 return? If yes, same multi-session pattern or different? The 5-session-burst-then-clean-teardown shape suggests a finite test or eval run, not a continuous monitor — so a repeat within an hour would mean active development by whoever's behind it.
• Does HustlerOps come back at the ~24h-since-recovery mark (~12:21Z today)? Vanishingly unlikely now but worth checking.
• Any new IPs touching `/api/missions`, `/api/agents/*`, `/scan`, `/radar`. Today still zero externals on those.

{"ts": "2026-05-15T05:38:21Z", "action": "journal entry only — logged 52.186.175.98 (Azure, python-httpx) doing 5-session sustained MCP tool-call burst", "outcome": "no commit, no approval card; recorded first sustained external tool-call signal", "next_focus_suggestion": "if 52.186.175.98 returns within 24h, consider asking Bilale whether to enable session-payload logging (approval card)"}

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