Answer target
How do I give Claude Code an API key safely?
Updated June 25, 2026
Short answer
Do not paste the provider key into Claude Code. Create a Claude Code agent identity, assign it to the project, grant only the required API key, and let Claude Code resolve that key at runtime through the approved credential path.
What to do now
If Claude Code needs a live key, give it a scoped way to retrieve that key during the task. Keep the raw provider value out of chat, issue comments, PR descriptions, and project files.
- Create a Claude Code agent identity.
- Assign it to the project it is working on.
- Grant only the API key required for the task.
- Have it resolve the key at runtime and clear temporary values.
Better pattern
Use a short-lived setup prompt or secure local profile to provision the agent, then use runtime resolution for provider secrets. The setup instruction and the provider credential are separate things.
Avoid
Avoid pasting production keys into Claude Code, giving Claude a human's full credential set, or leaving broad .env files in repos where the agent can read more than it needs.
Example
Claude Code fixing a GitHub integration can resolve only the GitHub token granted to that project. It does not need your Stripe, Supabase, PostHog, or Cloudflare keys.
Try this with one key
- 1.Store one API key.
- 2.Create one agent identity.
- 3.Grant only that key.
- 4.Resolve it at runtime.
- 5.See the audit entry.
No card required.
Treat Claude Code as a runtime, not a paste box
Claude Code can inspect files and run commands, so credential handling should look more like runtime access than message sharing. The agent gets a name, project boundary, direct grants, and audit history.
Separate setup prompts from provider keys
A short-lived setup prompt can authorize the agent to use ScopeHold. That is not the same as pasting a Stripe, OpenAI, GitHub, or Supabase key into chat. Provider keys should stay in managed custody.
Grant only the current project
Claude Code working on one repository should not inherit unrelated credentials from other products, clients, or experiments. Use the project as the first boundary and direct grants as the final boundary.
Practical workflow
- 1Create a Claude Code agentUse a durable name such as claude-billing-repo so audit history is clear.
- 2Provision the agent securelyUse the product's short-lived setup flow or a secure local profile rather than a provider key in chat.
- 3Grant the required API keyChoose the single provider secret needed for the task and grant it directly to the Claude Code agent.
- 4Resolve, verify, and clean upHave Claude resolve the credential, complete the task, verify the result, and clear temporary values.
Claude with pasted key vs Claude with scoped grant
Frequently asked questions
Should I paste an API key into Claude Code?
No. Use a scoped agent identity and runtime secret resolution so the provider key does not become part of the conversation or repo.
Can Claude Code test real integrations without seeing every key?
Yes. Grant the Claude Code agent only the key required for the project and task, then audit each resolve.
Is this different from a .env file?
Yes. A .env file places the value in the project or local environment; scoped resolution retrieves only the granted value when the agent needs it.
Where ScopeHold fits
ScopeHold is designed for exactly this handoff: Claude Code can get the one credential it needs for real work while ScopeHold keeps the raw provider key out of chat and records access.