Swytchcode | Legacy APIs weren't built for agents.
Legacy APIs weren’t built for agents.
Hundreds of versions. Incomplete specs. Undocumented sequences. Swytchcode gives your agent the implementation knowledge the vendor never wrote down, then governs every action it runs in production.
$npx swytchcode Book a demo
▸Use any AI coding agent
[Cursor](/content/use-cases/cursor "Cursor"/index.html) [Claude](/content/use-cases/claude "Claude"/index.html) [Windsurf](/content/use-cases/windsurf "Windsurf"/index.html)
▸Use any AI SDK
[OpenAI SDK](/content/use-cases/openai-sdk "OpenAI SDK"/index.html) [Anthropic SDK](/content/use-cases/anthropic-sdk "Anthropic SDK"/index.html) [Vercel AI SDK](/content/use-cases/vercel-ai-sdk "Vercel AI SDK"/index.html) [LangGraph](/content/use-cases/langgraph "LangGraph"/index.html) [CrewAI](/content/use-cases/crewai "CrewAI"/index.html)
Connect MCP, run the CLI, or call the runtime from the SDK you already use.
Why Swytchcode
Legacy APIs and AI agents don’t blend.
Swytchcode gives agents the implementation knowledge these APIs never documented, then governs every action that runs.
Which version? Which combination?
One API can carry years of versions, and a single operation can accept more valid field combinations than anyone documented. Your agent has no way to know which one your workflow needs.
200 OK. Body says failed.
The call returned success. The body carried an error. Your agent logged a win. The action never happened.
No allowlist. No dry run. No undo.
A destructive call runs against production instead of test. Nothing stops it mid-flight, and nothing records what happened.
How Swytchcode makes a legacy API usable by an agent.
Agents00Execute01Control02Observability03
Your agent calls an API it has never seen. We make sure it goes through.
Missing context, expired tokens, and undocumented changes break agents silently. Swytchcode catches all of it before the call goes out.
Codexclick to focus
Cursorclick to focus
Claude via Swytchcode
Charge $49 to the user's card on file.
swytchcode exec stripe.create_payment_intent
{ "id": "pi_3Te…", "amount": 4900, "status": "requires_confirmation" }
Payment intent created. Confirming now…
swytchcode exec stripe.confirm_payment_intent
{ "status": "succeeded", "payment_id": "pi_3TeBMH…" }
Demos and examples
Ship agents that finish the workflow.
Create the CRM contact, set up billing, send the welcome email. HubSpot contact created, Stripe customer set up, welcome email sent.
KYC, bank link, and policy checks before a transfer can run. Plaid linked, Persona KYC checked, Dwolla blocked or cleared by policy.
Open the GitHub issue, file the Jira ticket, ping Slack. Issue created, Jira ticket linked, engineering channel notified.
Pull the sheet, publish to Notion, email stakeholders. Metrics loaded, Notion page published, report emailed.
Generate a Stripe payment link and email it to the customer. Payment link created, customer emailed through Resend.
Ways to connect
Three ways to use Swytchcode.
One execution layer. Pick the surface that fits how you already build.
Connect Cursor, Claude, Codex, and other agents through the Model Context Protocol.
CLI
Install once, then get manifests and execute governed API calls from the terminal.
npx swytchcode
SDKs
Embed the same execution layer in your apps with JavaScript and Python runtime SDKs.
Developer experience
From vendor API to governed execution in minutes, not weeks.
Start with the workflow. Describe the business workflow, not the endpoint you hope is correct.
$npx swytchcode
Install the CLI in one command
$ npx swytchcode
Pull a corrected manifest
$ swytchcode get stripe
Fetching stripe manifest v2.1.0...
Policy file (tooling.json) updated
stripe ready to execute
Run
Execute with validation and audit >>
$ swytchcode exec stripe.create-payment
Validated against policy
Executed successfully
→{ "status": "success", "payment_id": "pi_3P..." }
Testimonials
One command. The right path. Reliable execution.
95% Faster integration
Zero to first successful CLI call. No SDK setup.
97% Developer adoption
Developers who run swytchcode exec finish their integration.
“With Swytchcode, developers can create fully functional TWAIN Direct scanning applications in minutes.”
KN
Kevin Neal
Founder · P3iD Technologies
“SwytchCode enabled rapid integration with our API. What used to take weeks to onboard now takes a single terminal command.”
HS
Handoyo Sutanto
Founder · Lyrid
One command to call any API.
Zero breaking calls.
Schema validation catches drift before it hits production.
Any API.
Bring your own manifest and start calling.
<50ms Validation overhead. Policy enforcement at near-zero latency.
“Swytchcode made it easy for our partners to integrate. The CLI-defined workflows significantly reduced integration time from 3 weeks to just 2 days.”
DA
Devesh Aggrawal
Co-Founder & CTO · Transactbridge
APIs
The APIs you need. One CLI to call them all.
Bring your own OpenAPI spec or use the integrations you already rely on. No per-service SDKs. No glue code.
$npx swytchcode [View all APIs](/content/apis/index.html)