Can Claude / ChatGPT / Cursor use Contact Book directly?

Yes, via the MCP server. It's a stdio JSON-RPC server that wires into Claude Desktop, Cursor, or any MCP-aware client in five lines of config. The list of tools matches your data model 1:1 - whatever a CRUD type exposes in the UI is exposed identically to the agent.

Do agent calls share the same auth + access controls?

Yes. The MCP server authenticates with the same JWT or PAT a human session uses. Sharing rules, org membership, rate limits, suspicion bans - all of it applies. There's no "agent backdoor" that bypasses the access matrix.

Is there an audit trail for agent actions?

Yes. Every mutation goes through the same audit-log path as a UI click. The transport (UI / API / CLI / MCP) is recorded as channel metadata so you can filter "what did the agent do this hour" from your account history.

Can I rate-limit an agent separately from a human?

Per-token rate limits apply, so you can issue an agent its own PAT and cap it independently. The shared user-level bucket also caps total throughput, so a runaway loop can't drain your whole account. The CLI's auto-update channel marker means you can also see in audit which version is calling.

Does the MCP / API surface cost extra?

No. Same plan, same surface. We don't paywall the agent - it's the same product, the same schema, the same access gates. If a plan can do X in the UI, it can do X via MCP.

Contact Book

Compare

Contact Book: the agent-friendly alternative to Cloze

Same product, same surface for humans and AI agents. MCP server + CLI + drop-in clients in 15 languages.

Agentic alternative

Personal CRM

Solo work

Julia YukovichCo-Founder + CEO

·March 7, 2026·

1 min read

Contact Book ships an MCP server you can wire into Claude Desktop or any MCP client in five lines. The same auth + access gates apply, the same audit log records every action, the same rate limits apply. Cloze doesn't currently expose this surface - that's the gap.

At a glance

Cloze ingests your email + calendar + social and uses AI to surface contacts you should reach out to. Contact Book is the opposite - it expects you to log meaningful interactions deliberately, and trades AI surfacing for a calmer, more private system. If you want a relationship intelligence engine that watches your inbox, Cloze is the obvious pick. If you want a personal CRM that does not read your email, that's exactly what we are.

Agent surface

What 'agent-friendly' actually means in practice

Contact Book ships an MCP server, a CLI, and drop-in clients in 15 languages. They're auto-generated from the same schema your UI uses; the auth, the access gates, the rate limits, the audit log all apply identically whether you're clicking buttons or calling the API. Cloze doesn't currently expose this surface, which is the gap a serious agent integration trips over - the agent ends up scraping the UI through a browser, which is fragile, slow, and silently bypasses everything below.

Contact Book vs Cloze: agent-readiness comparison

	Ours Contact Book	Theirs Cloze
Reads your email
Reads your calendar
Manual logging
AI relationship scoring
Conversation log
Stay-in-touch cadence
Hosted in Germany / EU
Free tier
Price	From €1/mo (free tier too)	$19.99-$29.99/mo

When to pick which

Pick Contact Book when

You don't want a tool that reads your email - even if it would surface useful prompts.

Manual entry suits you - typing in what mattered is the moment that helps you remember.

Hosted in Germany matters; you don't want US-headquartered infrastructure for your inbox-adjacent data.

Pick Cloze when

You'd genuinely use the AI suggestions and want a tool that watches your channels.

Sales-style relationship scoring helps you prioritise.

Inbox + calendar + social ingest is the killer feature for you.

Agentic-integration questions

What an agent-builder asks before wiring a tool into Claude / ChatGPT / Cursor.

Start with Contact Book

Free plan, no credit card. We host in Germany. Export + delete are self-serve.

Written by

Julia Yukovich

Co-Founder + CEO

Julia is one of the Co-Founders. She handles design, product direction, and most of the support replies that arrive in the morning.

julia.yukovich at aicuflow dot comLinkedIn