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The Canvas API lets you manage E.V.I. visual skill graphs programmatically. Design skills as node graphs, compile them into manifests, test in a sandbox, and publish to the marketplace or your organization.

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List Canvases

const canvases = await theo.canvases();

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Get Canvas

const canvas = await theo.canvas("canvas-uuid");

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Create Canvas

const canvas = await theo.createCanvas({
  name: "Support Agent",
  description: "Customer service skill with knowledge base",
  graph_json: {
    nodes: [
      { id: "in", type: "input", position: { x: 300, y: 0 }, data: { type: "input", label: "Input", config: { triggerType: "manual" } } },
      { id: "p1", type: "prompt", position: { x: 280, y: 120 }, data: { type: "prompt", label: "Prompt", config: { content: "You are a helpful support agent." } } },
      { id: "m1", type: "model", position: { x: 300, y: 260 }, data: { type: "model", label: "Model", config: { modelId: "theo-1-flash" } } },
      { id: "out", type: "output", position: { x: 300, y: 400 }, data: { type: "output", label: "Output", config: { format: "text" } } },
    ],
    edges: [
      { id: "e1", source: "in", target: "p1" },
      { id: "e2", source: "p1", target: "m1" },
      { id: "e3", source: "m1", target: "out" },
    ],
  },
});

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Update Canvas

await theo.updateCanvas(canvas.id, {
  name: "Updated Support Agent",
  graph_json: updatedGraph,
});

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Delete Canvas

await theo.deleteCanvas(canvas.id);

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Compile

Validates the graph topology and compiles into a SkillManifest + WorkflowSteps. 
const result = await theo.compileCanvas(canvas.id);
if (result.compiled) {
  console.log("Manifest:", result.manifest);
  console.log("Steps:", result.steps);
} else {
  console.error("Errors:", result.errors);
}

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Test (Sandbox)

Send a test message through the compiled canvas. Tool calls are simulated. 
const test = await theo.testCanvas(canvas.id, "Check stock for SKU-1234");
console.log(test.response);
console.log(`Cost: ${test.cost_cents} cents`);
Multi-turn testing with history: 
const test = await theo.testCanvas(canvas.id, "What about SKU-5678?", [
  { role: "user", content: "Check stock for SKU-1234" },
  { role: "assistant", content: "SKU-1234 has 47 units in stock." },
]);

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Publish

Compile, review, and publish as a skill. Choose visibility: 
// Private — only you
await theo.publishCanvas(canvas.id, {
  slug: "my-agent",
  version: "1.0.0",
  author: { name: "Your Name" },
  visibility: "private",
});

// Organization — visible to your org members
await theo.publishCanvas(canvas.id, {
  slug: "team-agent",
  version: "1.0.0",
  author: { name: "Your Name" },
  visibility: "org",
  target_org_id: "org-uuid",
});

// Public marketplace
await theo.publishCanvas(canvas.id, {
  slug: "public-agent",
  version: "1.0.0",
  author: { name: "Your Name" },
  visibility: "public",
  readme: "# Public Agent\nA skill for everyone.",
});