Trusty Squire

Trusty Squire is an MCP server that lets Claude Code, Codex, Cursor, OpenCode, Goose, and other coding agents create accounts on real websites and retrieve the API keys automatically — then saves each key in an encrypted, write-only vault instead of your chat, your code, or your .env. The raw provider secret never needs to enter the agent's context, so it can't be pasted into a commit or leaked in a log.

It is not a secrets manager for keys you already have, and not a browser-automation framework you script per site. Point your agent at a service — “set up Clerk and wire in the key” — and Trusty Squire opens a real browser, works through signup or sign-in one step at a time, clears the bot-detection and email-verification steps that make operator tools stall, and captures the generated key. When a real person is required for phone verification, a hard CAPTCHA, 3-D Secure, an unsupported payment, or another decision, it stops and says so rather than pretending the signup completed.

Built to be handed the keys. Provider secrets are write-only: the agent's credential tools return references and authenticated results, never stored plaintext. Backend access is a host-scoped, rate-limited, independently revocable grant, so a leaked token is killed without rotating the provider key — and you connect Google or GitHub yourself in a real browser, so the agent never types your password. Full threat model below.

One prompt

Use Trusty Squire to create a Clerk account for this app, save the generated secret key, allow api.clerk.com for server-side requests, and wire it in without putting the raw key in chat, code, or .env.

Your coding agent plans the job. Trusty Squire operates the website, stores the generated key, and can issue your backend a scoped grant. The backend calls the provider through Trusty Squire, which injects the provider key on the server side.

Other useful asks:

• “Create a Render API key for deployment automation and keep it out of this conversation.”

• “Set up OpenRouter without returning its API key to this conversation.”

• “Pay this checkout with my saved work card and ask me to approve it on my phone.”

• “That app grant leaked. Revoke it without rotating the provider key.”

For supported card checkouts, save a card in the Vault from a passkey-capable device or let your first operate_pay approval link collect one just in time. When no card is specified, Trusty Squire uses the only saved card, starts the add-card ceremony if none exists, or asks you to choose when several exist. The new card is encrypted in your browser with a passkey-derived key and bound to that purchase before approval; if you add it but do not approve in time, it remains saved for a faster retry.

Recognized Visa, Mastercard, Amex, Discover, Diners Club, and JCB cards show their network mark in the Vault while keeping the full bank/network label. Open a card row to see its masked number; reveal runs the passkey ceremony in your browser before showing the number, name, expiry, and billing address. The CVV is never shown, even after reveal. The Activity page also records card additions and removals, payments, and app-grant changes without storing a PAN or CVV.

operate_pay requires a non-empty item and reason (calls that omit either receive a validation error). It reads the checkout total, sends you a short-lived approval link, and submits only after you approve the exact purchase. Page currency notation is authoritative: Trusty Squire refuses to create an approval when it cannot resolve that notation, or when the displayed fractional precision conflicts with an agent-supplied fallback currency. Approval, 3-D Secure, Activity, and notification amounts use the currency's minor-unit precision (for example, whole yen for JPY and two decimals for USD). The anonymous approval page shows the merchant, checkout origin, amount and currency, item, and reason directly from the short-lived server record before one passkey ceremony authorizes those canonical payment values. You also see the requesting MCP client (for example, Hermes) and that a saved card will be used before clicking Approve payment to relay the operator-sealed final authorization. A first-time payment is refused if the merchant, checkout origin, amount, or currency changes between approval and submission. If the checkout exposes PayPal Smart Buttons or PayPal-hosted fields, Trusty Squire hands the checkout back before selecting a saved card or creating an approval; it does not sign in to PayPal or use vaulted PayPal credentials. If the issuer requires 3-D Secure, Trusty Squire notifies your linked Telegram chat and waits 180 seconds by default for you to complete the challenge in the open checkout instead of automating it. It reports a visible success or decline and hands an unresolved challenge back on timeout. three_ds_wait_seconds accepts whole seconds from 0 to 600; set it to 0 on operate_pay to skip the notification and waiting and receive the handoff immediately.

Connect Telegram under Vault Settings to receive secret-free alerts for credential, card, payment, and app-grant lifecycle changes. Routine credential retrieval and proxy access stay in Activity instead of sending a push for every request.

Related MCP server: Daemoon

Install

npx @trusty-squire/mcp connect

connect signs you in with Google or GitHub, detects your coding agent, and merges the squire MCP server into its existing configuration. Restart the agent and ask for the finished website outcome. Trusty Squire is free to start.

To choose a target explicitly:

npx @trusty-squire/mcp connect --target=codex

Supported targets: claude-code, cursor, codex, opencode, goose, cline, continue, and hermes.

What happens

1. Your coding agent names the website and the account, setup, or credential it needs.

2. Trusty Squire opens a real browser and works through the service flow one step at a time. It can use a Google or GitHub session that you explicitly connect.

3. When the site reveals an API key or client secret, Trusty Squire captures it into the vault without returning the raw value through its credential tools.

4. The agent can make an authenticated request through Trusty Squire or create a host-scoped, rate-limited app grant.

5. Eligible successful flows can become signed registry skills, so later runs can replay verified steps instead of rediscovering every click.

If a site requires phone verification, a hard CAPTCHA, an unsupported payment, 3-D Secure, or another human decision, the run stops and tells you. It does not guess or pretend the signup completed.

Supported services

Discovery pages are generated only for services with an active skill in the Trusty Squire registry. The first five detailed pages cover Braintrust, Cerebras, Clerk, DeepInfra, and Zilliz Cloud. Each sample has explicit signup evidence in its active registry record and a provider request checked against official API documentation. The service hub also lists every active registry entry; the remaining detail pages stay unpublished until their workflow and unique content pass review.

Browse the active service catalog. Maintainers can detect registry drift before merging with:

pnpm seo:verify-services

The registry controls which service pages exist. An external list is never used to claim support.

Keep provider keys out of agent context

Ask the agent to create a scoped backend grant:

Grant this backend access to Clerk through Trusty Squire with a limit of 100 requests per hour.

Before minting the grant, make api.clerk.com the credential's primary allowed host in the Vault. The egress proxy refuses every other upstream host. This explicit policy step is required when the signup host and provider API host differ.

The agent calls the real MCP tool with the service and requested limit:

grant_app_access({
  service: "clerk",
  rate_limit_per_hour: 100
})

Rate limits are opt-in. Omitting rate_limit_per_hour creates an unlimited grant; host scoping, auditing, and revocation still apply. When a grant reaches an explicit hourly limit, the proxy returns 429 rate_limited with scope: "grant", Retry-After, and window/reset metadata.

The result contains a host-scoped egress base_url and a token, not the Clerk secret key. The token is returned once through the MCP result and remains valid until revoked. That means the scoped grant token can enter agent context; it is not the provider key. Move it directly into backend-only deployment secret storage, never browser code, logs, or source control. If you need zero grant-token exposure to the model, use use_credential for agent-initiated requests instead. Trusty Squire removes the grant authorization at the boundary and injects the vaulted provider credential into the upstream request.

Security and threat model

• Provider credentials are encrypted in the vault and are write-only to agent credential tools. Those tools return references or authenticated results, not stored plaintext.

• The raw provider key is injected only into the outbound provider request. It does not need to land in chat, generated code, the consuming app, or the project's .env file.

• App grants are host-scoped, auditable, rate-limitable, and independently revocable. A leaked grant can be revoked without rotating the provider key.

• You connect Google or GitHub in a real browser. Trusty Squire does not ask the coding agent to type those passwords.

• Saved cards are encrypted in your browser with a passkey-derived key. For a payment, your phone releases the card only to that checkout's ephemeral local operator after one passkey authorization over the exact details already shown on the approval page. The API temporarily relays only operator-sealed card ciphertext and its signed mandate; successful operator confirmation clears those relay bytes. Trusty Squire's API and the coding-agent model never receive plaintext PAN or CVV. See the security model for the signed mandate's binding contract.

• Browser screenshots and diagnostics can contain whatever a website visibly rendered. Treat diagnostic artifacts as sensitive and do not ask an agent to re-observe a page after a secret is shown.

• Trusty Squire does not bypass phone verification, hard CAPTCHAs, 3-D Secure, payment authorization, or decisions that belong to a person. It stops for human input.

See the security model for the card and credential trust boundaries, and architecture for the system and data flows.

MCP tools

• operate_start, operate_observe, and operate_act open a website, inspect the current state, and perform one browser action at a time. If a visible control has no observed ref, click and js_click can target its live text=… or css=… locator; that one-off fallback is not replayable.

• operate_extract captures a generated credential into a sealed slot or the vault.

• operate_remember saves a postcondition-verified local recipe under a closed task verb plus the service's registrable domain. It records stable target attributes and exact provenance for Squire-supplied values, not observed refs or plaintext secrets. operate_use binds new values and replays those steps; on one missed step it returns a local repair point and can continue in the same session. Older name-only recipes remain planning hints.

• list_payment_cards returns saved-card labels and opaque references; operate_pay can use a selected card, the only card on file, or a just-in-time add-card approval, then fills the checkout and waits for the user to resolve 3-D Secure before handing back unresolved challenges.

• list_credentials and use_credential find saved credentials and make authenticated API calls without returning raw values.

• grant_app_access and revoke_app_access create and remove scoped backend access.

• audit_log reports credential activity without exposing credential values.

One README for GitHub and npm

This root file is the canonical README. The npm pack lifecycle copies it into @trusty-squire/mcp byte-for-byte, then removes the generated package-local copy after packing. GitHub and npm therefore publish the same product explanation.

Development

git clone https://github.com/Trusty-Squire/trusty-squire.git
cd trusty-squire
./scripts/bootstrap.sh

After bootstrap, pnpm typecheck and pnpm test should pass. Stop local services with docker compose -f docker-compose.dev.yml down; add -v to reset their data.

Requirements: Node 20.11.0 (.nvmrc), pnpm 8.15+, Docker, and Docker Compose.

Repository map:

trusty-squire/
├── apps/
│   ├── api/        Accounts, OAuth, machine tokens, proxy, inbox, vault, and billing
│   ├── mcp/        MCP server, browser operation tools, and credential tools
│   ├── registry/   Signed website skills and verification service
│   └── web/        Marketing site and vault UI
└── packages/
    ├── vault/        Encrypted credential storage and audit log
    └── skill-schema/ Shared schema for replayable website skills

Product and public-web changes should follow PRODUCT.md and DESIGN.md.

License

MIT © Trusty Squire