offprompt vs Infisical

Q: Does Infisical's MCP server keep secret values out of the agent's context?

By default its MCP server returns secret values from get-secret and list-secrets, so reading one through the agent puts the value into its context. Since version 0.0.24 you can set INFISICAL_MASK_SECRET_VALUES=true to replace them with , and restrict which tools are exposed. offprompt takes the question out of configuration: its results never carry a value, only the key’s name and a fingerprint. For the side-by-side of the MCP servers, see the three-way comparison linked below.

Q: Does offprompt stop the agent reading the file it writes?

No. offprompt writes the key to .env.local, which is on disk, and it does not watch what the agent reads. Every result tells the agent not to open the file and lists the keys it holds. To enforce it, close the agent’s file tools to the file with a deny rule in Claude Code or .cursorignore in Cursor. How to keep secrets out of your AI agent’s context goes through each way in.

Infisical is an open-source secrets platform. You keep a project's secrets in it, self-hosted or in Infisical Cloud, and read them with its CLI, SDKs, API or MCP server, with versioning, validation rules and machine identities around them. offprompt is for the step before a secret has a home: a coding agent hits a task that needs a key the project does not have, and instead of asking for it in the chat, it asks offprompt, which opens a page in your browser for you to type the key.

They answer different problems, and they work together.

At a glance

Question	offprompt	Infisical
What it is	An MCP server the agent calls to ask you for a value it lacks, which it writes into the project	An open-source secrets platform you self-host or run in the cloud, with a dashboard, a CLI and an MCP server
How a value gets in	You type or paste it on a page served from `127.0.0.1`. The agent never handles it	You add it in the dashboard, the CLI or the API. A new value does not come from the task at hand
Where values live	In the project's `.env`, `.env.local` or another file the agent names	In Infisical Cloud or a self-hosted Infisical, read under a machine identity
How code reads a value	From the file, as `process.env.NAME`	`infisical run -- <cmd>` injects secrets as environment variables, or `infisical export` writes a `.env`
Keeps a value out of the agent's context	Yes. Results carry the key names, the file and a four-emoji fingerprint, never values	Its MCP server returns values from `get-secret` and `list-secrets` by default; `INFISICAL_MASK_SECRET_VALUES=true` masks them
Checks a key's format	Yes, against a registry of 65 providers and 111 kinds of key, such as a prefix and a length	Yes, against rules your project sets, such as a length, a regex or a prefix, checked on every write
Self-hostable	Runs on your machine; there is nothing to host	Yes, via Docker, Docker Compose or Kubernetes; or use Infisical Cloud
An agent using a key it never sees	The value never reaches the agent in the first place	Agent Vault (preview): a proxy that adds the real credential to an agent's requests, so the agent never holds it
Account needed	None	An Infisical account or your own instance, with a machine identity
License and price	MIT, free	Core is MIT, with an `ee/` enterprise-licensed part. A free plan and paid plans

What each tool's own docs say, as of 9 November 2026. “Not documented” means its docs do not say.

What Infisical is best at

Infisical is a home for the secrets a team already has, and it is open source: the core is under the MIT license, with an ee/ directory under a separate enterprise license, and you can self-host it with Docker or Kubernetes or use Infisical Cloud. You organise secrets by project and environment, read them with infisical run -- <command> or write a .env with infisical export, and get versioning, secret scanning and validation rules on top.

It reaches well past a key-value store: dynamic secrets, rotation, PKI, SSH, KMS and, for agents, an Agent Vault (preview) that proxies an agent's requests and attaches the real credential as they leave, so the agent never holds it. If you want a secrets platform you can run yourself, that is what Infisical is for.

When to pick Infisical

Reach for Infisical, not offprompt, when:

a team shares secrets and you want one place to hold, version and audit them;
you want to self-host the secrets platform rather than depend on a SaaS;
you need machine identities, dynamic secrets, rotation or PKI;
you want an agent to call an API through a credential it never reads (Agent Vault).

offprompt does none of these. It stores nothing, and once the value is in the file, it is done.

Where offprompt fits

offprompt covers the key that is not in any store yet, when a coding agent would otherwise ask for it in the chat. The agent calls collect_secret with the key's name, why it needs it and the file it goes in; offprompt opens its page on 127.0.0.1, you type the key, and it writes the file and answers the agent with the key's name and a four-emoji fingerprint. The value is never in a prompt, a tool argument or a tool result, and from a cloud sandbox the agent passes you a link through a Cloudflare quick tunnel, with the value encrypted in your browser to a key only the sandbox holds.

One honest caveat, the same offprompt gives everywhere: it writes the key to .env.local, and it does not stop an agent that can read files from opening it. Every result tells the agent not to and lists the keys the file holds; to be sure, close the agent's file tools to it with a deny rule in Claude Code or .cursorignore in Cursor.

Using them together

Capture a new key with offprompt so its value never touches the chat, then add it to Infisical to share, version and rotate it. Or start from Infisical and bring what you already keep to the agent's project:

On your laptop

infisical export --format=dotenv > /tmp/secrets.env
# drop /tmp/secrets.env on offprompt's page; it takes only the keys the agent asked for

offprompt's page reads that file and keeps only the keys the agent requested, so a sandbox holds no Infisical machine identity. See Values you already keep. For how offprompt lines up against Infisical's MCP server in particular, next to 1Password's, read offprompt vs 1Password Environments MCP vs Infisical MCP.

Sources

What Infisical's own docs say, as of 9 November 2026.

Something here out of date? Open an issue on GitHub.

FAQ

Is offprompt an alternative to Infisical?

No. Infisical is a place to keep a team’s secrets, self-hosted or in its cloud, with a dashboard, versioning, a CLI and more. offprompt keeps no store. It is for the moment a task needs a key the project does not have yet: the agent asks for it by name, you type it on a page in your browser, offprompt writes it to the file, and the agent learns only that the key exists. Once a key exists, Infisical is a good place to keep it.

Does Infisical's MCP server keep secret values out of the agent's context?

By default its MCP server returns secret values from get-secret and list-secrets, so reading one through the agent puts the value into its context. Since version 0.0.24 you can set INFISICAL_MASK_SECRET_VALUES=true to replace them with <masked>, and restrict which tools are exposed. offprompt takes the question out of configuration: its results never carry a value, only the key’s name and a fingerprint. For the side-by-side of the MCP servers, see the three-way comparison linked below.

Can I use offprompt and Infisical together?

Yes. Capture a new key with offprompt so its value never enters the chat, then add it to Infisical to share, version and rotate across the team. The other way, infisical export --format=dotenv writes a file on your laptop that you drop on offprompt’s page, which keeps only the keys the agent asked for, so a sandbox never needs an Infisical machine identity.

How is offprompt's key checking different from Infisical's validation rules?

They check at different times, against different things. Infisical checks a value as it is written against rules your project sets, such as a minimum length, a regex or a required prefix. offprompt checks a value as you type it against a built-in registry of 65 providers and 111 kinds of key, so a key pasted from the wrong provider, or with the wrong prefix or length, is caught before it is written, with no rules for you to configure.

Does offprompt stop the agent reading the file it writes?

No. offprompt writes the key to .env.local, which is on disk, and it does not watch what the agent reads. Every result tells the agent not to open the file and lists the keys it holds. To enforce it, close the agent’s file tools to the file with a deny rule in Claude Code or .cursorignore in Cursor. How to keep secrets out of your AI agent’s context goes through each way in.

Try it

In a project's folder, run the command below, then ask the agent for something that needs a key. The agent calls offprompt when it reaches the step that needs one.

$npx offprompt init

Other comparisons

offprompt vs HashiCorp VaultVault is identity-based secrets infrastructure that issues short-lived credentials to services. offprompt is the small step before that: getting a key a coding agent needs into the project without the chat.
offprompt vs DopplerDoppler is a hosted secrets manager that syncs one source of truth to every environment and injects it with doppler run. offprompt captures a new key an agent needs without the value reaching the chat.
offprompt vs 1Password1Password keeps your team’s secrets in a vault and injects them into commands with op run, never writing them to disk. offprompt captures a new key an agent needs without the value reaching the chat.

Or the three-way look at the MCP servers: offprompt vs 1Password Environments MCP vs Infisical MCP.