Building Your Own Claude Code Gateway: What It Actually Takes

You understand why Claude Code needs a control plane — per-agent credentials, policy enforcement, audit logging, operational controls. Now the question: build it yourself or use an existing solution?

Building your own is a legitimate option for some teams. Here’s the honest breakdown.

What You’d Need to Build

A functional Claude Code gateway has seven major components.

1. API Proxy Layer (4-6 weeks) A reverse proxy between Claude Code and the Anthropic API. Intercepts calls, injects session metadata, enforces rate limits, records token usage, applies content filters. Basic proxy: 2-3 weeks. Reliable proxy with connection pooling, retry logic, and graceful degradation: another 2-3 weeks.

2. Credential Vending Service (3-4 weeks) Generates temporary, scoped credentials per agent session. For AWS: STS AssumeRole with session tags. For Git: short-lived tokens. The AWS integration is straightforward; Git credential vending is trickier (GitHub Apps vs Bitbucket have different token mechanics).

3. Policy Engine (4-6 weeks) Evaluates whether an operation is allowed for a given session. You can use an existing framework (Casbin, Open Policy Agent, Cedar) or build your own. The policy language design is the hard part — too simple and you can’t express real policies, too complex and nobody can write them.

4. Audit Log System (5-7 weeks) Records every operation with full context in structured, immutable storage. Basic logging to CloudWatch: 2-3 weeks. Query interface, retention policies, export capabilities, and immutability guarantees: another 3-4 weeks.

5. Session Management (3-4 weeks) Tracks active sessions, their state, resource usage, and provides control mechanisms (pause, resume, kill). The basic lifecycle is simple. Hard parts: real-time cost tracking, graceful session termination, handling sessions that lose connectivity.

6. Slack Integration (4-6 weeks) Sends approval requests and notifications. Receives callbacks. Routes to the right channels. Basic notifications: 2-3 weeks. Interactive approval workflows, timeout handling, escalation logic: another 2-3 weeks.

7. Dashboard (4-6 weeks) Web interface showing active sessions, recent operations, cost metrics, policy violations. Needs real-time updates (WebSocket) and historical queries.

Total Effort

Component	Build	Monthly Maintenance
API Proxy	4-6 weeks	2-4 hrs
Credential Vending	3-4 weeks	4-6 hrs
Policy Engine	4-6 weeks	4-8 hrs
Audit Logs	5-7 weeks	2-4 hrs
Session Management	3-4 weeks	2-4 hrs
Slack Integration	4-6 weeks	1-2 hrs
Dashboard	4-6 weeks	4-8 hrs
Total	27-39 weeks	19-36 hrs/mo

That’s 6-9 months of a senior engineer’s time, plus 20-35 hours per month ongoing maintenance. These are conservative estimates for an engineer who already knows the AWS SDK, has built proxy services before, and understands the Claude Code architecture.

What You Can Skip Initially

Not everything is needed from day one:

• Weeks 1-4: Proxy + Audit. Get visibility. See what agents are doing, track costs.
• Weeks 5-10: Policy Engine + Session Management. Add controls.
• Weeks 11-16: Credential Vending + Slack. Add security and communication.
• Weeks 17-24: Dashboard. Add visibility for the whole team.

This gets you basic visibility in a month and functional governance in four months.

When DIY Makes Sense

Building your own is right when:

• Unusual integration requirements. Your CI/CD, cloud provider, or internal tools aren’t standard.
• Deep customization needed. Your policy model or approval workflow is unique and can’t be configured in existing products.
• Engineering capacity available. A senior engineer with 6-9 months and no other priorities who will also maintain it ongoing.
• Full code ownership required. For regulatory or security reasons, you need to own and audit every line.

When to Use Sentrely

Using an existing solution is right when:

• You need governance now, not in six months. The business value is in the agents, not the infrastructure.
• Standard integrations. AWS, GitHub/Bitbucket, Slack, standard Claude Code.
• Engineering time is better spent on product. Every hour building a proxy is an hour not building what customers pay for.
• Compliance deadline looming. SOC 2 audit in three months? You don’t have time to build and prove a custom solution.

Sentrely provides all seven components out of the box. The trade-off is the standard build-vs-buy equation: building gives you control and customization, buying gives you speed and reduced maintenance burden.

The cost of building isn’t just the initial 6-9 months — it’s the ongoing 20-35 hours per month of maintenance, the opportunity cost of the engineer’s time, and the risk that the engineer who built it leaves and nobody else understands it.

The Decision Framework

Ask three questions:

1. How urgently do you need governance? “We needed it yesterday” makes DIY impractical.
2. How custom are your requirements? Standard stack → existing solution. Unique requirements → might need to build.
3. What’s the engineering opportunity cost? Is 6-9 months of a senior engineer on a gateway worth more than whatever else they’d build?

For most teams: use an existing solution, ship agents now, build custom components later if you actually need them.

The worst option is running Claude Code in production with no governance at all. That’s not a build-vs-buy decision. That’s a risk acceptance most organizations can’t justify.