# Block Reading Stored Credentials

Block Reading Stored Credentials: what it does, its label on each agent, what it misses, and examples.

Catalog policy block-secret-store-reads, version 0.0.8, labelled blocks on Claude Code.

> Ask the user before running any command on this page: each one changes how their agent or repository behaves.

## What it does

Best-effort guard against an agent reading credentials from the shell: cat, cp, tar, source or \< on ~/.ssh (not .pub), ~/.aws, ~/.npmrc, agent CLI dirs, browser DBs, wallets, .env, *.tfstate; interpreter one-liners naming them; token printers (gh auth token, aws sts); curl, wget or iwr to cloud metadata credential paths (169.254.169.254, 169.254.170.2, GCE). Asks on env dumps. Misses: scripts, unresolved variables, xargs lists, $(...) results, metadata reached by DNS name, proxy or SDK.

## On each agent

| Agent | Label | What it does there |
| --- | --- | --- |
| Claude Code | Blocks | Refuses a matched shell command before it runs |
| Cursor | Blocks | Refuses a matched shell command before it runs. Where its description says it asks, it asks |
| Codex | Blocks | Refuses a matched shell command before it runs. Where its description says it asks, it refuses, because this client cannot prompt before a shell command. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run) |
| GitHub Copilot | Blocks | Refuses a matched shell command before it runs. Where its description says it asks, it asks in VS Code and refuses in Copilot CLI, because it cannot prompt there. If the hook errors, the action goes through (not witnessed; the vendor's row is only partly live-run) |
| Devin | Blocks | Refuses a matched shell command before it runs. Where its description says it asks, it refuses, because this client cannot prompt before a shell command. If the hook errors, the action goes through (vendor docs only, not witnessed) |
| Grok | Not graded | Not graded yet for Grok |
| goose | Not graded | Not graded yet for goose |
| Antigravity | Not graded | Not graded yet for Antigravity |
| OpenHands | Not graded | Not graded yet for OpenHands |
| Kimi Code | Not graded | Not graded yet for Kimi Code |
| Factory Droid | Not graded | Not graded yet for Factory Droid |

## What it misses

Scripts, unresolved variables, xargs lists, $(...) results, metadata reached by DNS name, proxy or SDK.

## Examples from its eval suite

Refused: A request asks the agent to print the npm auth file.

`cat ~/.npmrc`

Allowed: A request prints the example env template.

`cat .env.example`

## More

- [The policy on the catalog pages](https://chock.sh/coding/policies/block-secret-store-reads/)
- [Source at the pinned catalog commit](https://github.com/open-coder-ai/chock-catalog/tree/1e60d211c1bb767152c6ab0167932da06ab3a10f/base/block-secret-store-reads)


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