Keyclasp lets a coding agent choose a named credential and pass it to a command without putting the secret value in the agent’s prompt. The command still receives the real credential, so this is a way to limit exposure in agent context—not a sandbox or a guarantee against leaks.
How does Keyclasp work?
Keyclasp is a local-first command-line interface (CLI) that stores credentials in a local encrypted vault. An agent can select a credential by name and scope; it does not need to read the value to make that selection. Keyclasp injects the selected value into the environment of a child command.
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The project’s example is:
keyclasp run --project myapp --environment dev --env API_KEY -- npm testHere, myapp and dev identify the project and environment namespaces, while API_KEY names the selected vault entry. Keyclasp runs npm test as a child process with that credential in its environment. Operators can require authorization or explicitly allow selected secrets to be used unattended. The README also describes a packaged agent skill that explains how to use the CLI. Keyclasp README
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe README’s demonstration uses a dummy credential in a temporary vault and checks whether the child process receives the variable; it does not print the value or contact an external service. That is the project’s documented demo, not an independent security test.
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What does Keyclasp protect—and what does it not?
It keeps the value out of the agent’s selection step
The agent can request a credential by its name and scope without having the secret copied into its prompt. This can avoid workflows where a developer manually runs a command and copies its output back, or where an agent sees a credential printed in command output. The project author describes that as the problem Keyclasp is intended to address; it is not evidence about how all developers work.
The child command remains trusted with the secret
Once launched, the child process receives the real credential. It can write the value to disk, send it over a network, or pass it to another process. Keyclasp does not sandbox the command or isolate the credential from other processes running as the same operating-system user. Project and environment names are namespaces, not security boundaries.
The child also inherits the caller’s existing environment. The --env option limits which vault entries Keyclasp selects; it does not remove credentials already exported in the shell.
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According to the README, Keyclasp scans standard output and standard error for exact injected values that are at least eight characters long. If it finds a match, it redacts the value, stops forwarding output, and attempts to terminate the supervised process group where operating-system permissions allow. The project warns that commands allowed to change privilege may become impossible to terminate.
This guard is not a general leak-prevention system. It does not cover values shorter than eight characters, transformed values, fragments of a secret, data written to files, or network traffic. A command can leak a credential without printing its exact value.
Local encryption does not defend against every machine compromise
The project says its local vault uses AES-256-GCM and that it has no account, cloud service, or runtime telemetry. Those are project claims, not independently verified findings. Its README also says software-derived machine identity does not provide Secure Enclave or TPM protection or theft resistance. Neither machine nor passphrase custody protects credentials from root access or a compromised operating system. Names and policy metadata remain plaintext, and memory cleanup is best effort. Keyclasp README
Who should consider Keyclasp?
Keyclasp may suit a developer who wants an agent to launch credential-dependent commands while keeping secret values out of the agent’s prompt, and who is prepared to trust the commands receiving those credentials. It is not a substitute for reviewing command behavior, limiting credential permissions, or controlling what the process can access.
The project author, Andrea Catalucci, says in the launch announcement: “The child process receives the requested token through its environment.” That boundary is central to deciding whether the workflow fits: the agent need not read the token, but the command does. Catalucci also states: “Keyclasp hasn’t had a professional third-party security audit.” Catalucci’s project announcement
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does it differ from 1Password’s command-line workflow?
The Keyclasp README contrasts its workflow with 1Password’s op run and a separate 1Password MCP server. This comparison describes the projects’ documented approaches, not a universal security ranking.
| Consideration | Keyclasp | 1Password workflows described in the README |
|---|---|---|
| Credential source | Local encrypted vault, according to the project | 1Password account and its stored items or Environments |
| Agent setup and discovery | README describes an agent skill and scoped discovery of credential names | op run uses predeclared references or a selected Environment; the MCP server can expose Environment and variable names without returning secret values |
| Per-command selection | Explicit selection of named entries for a command | op run uses references or the selected Environment |
| Output masking | README documents scanning for exact injected values of at least eight characters in stdout and stderr | The README does not describe an equivalent output-masking behavior for these workflows |
| Trust boundary | The child receives the credential; same-user processes are not isolated | The README says the child receives credentials and shares same-user environment-access limitations |
The README suggests 1Password may be a better fit for teams already using it and comfortable maintaining references or Environments. The practical distinction is the credential source and how an agent selects entries; neither approach removes the need to trust the child command.
Is Keyclasp available on your system?
The current README lists Node.js 24 or 26 and support for macOS arm64 or glibc Linux arm64/x64. It identifies Windows, Intel Macs, and Alpine/musl Linux as unsupported. The project’s launch announcement gives this beta installation command:
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npm install -g keyclasp@betaBecause the project is identified as beta and platform support can change, check the current README before installing. Keyclasp is MIT-licensed and its README says it began as a fork of Keyblind, created by Mohammed Aarif Shaikh. Keyclasp README Project launch announcement
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