Edge Function Generator Skill

Edge Function Generator

Context Files

Read from Docs/context/ for project-specific patterns:

supabase-map.md - Edge Functions list and structure
db-schema-short.md - Database tables for queries

Centralized Dependencies

All Edge Functions import from _shared/deps.ts - never use direct URLs:

import { serve, createClient, corsHeaders, crypto } from "../_shared/deps.ts";

The deps.ts module centralizes all versions (deno std@0.190.0, supabase-js@2.49.1) and includes the XHR polyfill as a side-effect import. See references/versions.md for rationale and Docs/ops/edge-deps-standardization.md for upgrade instructions.

Edge Function Structure

supabase/functions/
├── _shared/              # Shared modules (import with ../_shared/)
│   ├── deps.ts           # Centralized dependencies - import from here!
│   ├── ai-config.ts
│   ├── ai-prompt.ts
│   ├── ai-providers.ts
│   └── ai-quota.ts
├── function-name/
│   └── index.ts

Minimal Template

import { corsHeaders, createClient, serve } from "../_shared/deps.ts";

serve(async (req) => {
  if (req.method === "OPTIONS") {
    return new Response(null, { headers: corsHeaders });
  }

  try {
    const supabaseUrl = Deno.env.get("SUPABASE_URL")!;
    const supabaseKey = Deno.env.get("SUPABASE_SERVICE_ROLE_KEY")!;
    const supabase = createClient(supabaseUrl, supabaseKey);

    // Your logic here

    return new Response(
      JSON.stringify({ success: true }),
      { headers: { ...corsHeaders, "Content-Type": "application/json" } }
    );
  } catch (error) {
    return new Response(
      JSON.stringify({ error: error.message }),
      { headers: { ...corsHeaders, "Content-Type": "application/json" }, status: 500 }
    );
  }
});

With JWT Authentication

// Get user from JWT
const authHeader = req.headers.get("Authorization");
if (!authHeader) {
  return new Response(JSON.stringify({ error: "Unauthorized" }), {
    status: 401,
    headers: { ...corsHeaders, "Content-Type": "application/json" },
  });
}

const supabase = createClient(supabaseUrl, supabaseAnonKey, {
  global: { headers: { Authorization: authHeader } },
});

const { data: { user }, error: authError } = await supabase.auth.getUser();
if (authError || !user) {
  return new Response(JSON.stringify({ error: "Invalid token" }), {
    status: 401,
    headers: { ...corsHeaders, "Content-Type": "application/json" },
  });
}

With AI Integration

// deps.ts already imports XHR polyfill as side-effect
import { corsHeaders, createClient, serve } from "../_shared/deps.ts";
import { getFeatureConfig } from "../_shared/ai-config.ts";
import { getPrompt } from "../_shared/ai-prompt.ts";
import { callProvider } from "../_shared/ai-providers.ts";
import { enforceQuotaOrThrow } from "../_shared/ai-quota.ts";

// Check quota before AI call
await enforceQuotaOrThrow(featureKey, estimatedTokens, userId);

// Get config and prompt from DB
const config = await getFeatureConfig(featureKey, "prod");
const prompt = await getPrompt(featureKey, variables, "prod");

// Call AI provider
const response = await callProvider({
  vendor: config.vendor,
  model: config.model,
  systemPrompt: prompt.systemPrompt,
  userPrompt: prompt.userPrompt,
  params: config.params,
});

Version Audit Workflow

When auditing for stray direct imports:

# Should return ONLY deps.ts - no other files should have direct URLs
grep -r "deno.land/std@" supabase/functions/ | grep -v deps.ts
grep -r "esm.sh/@supabase" supabase/functions/ | grep -v deps.ts

If any function has direct imports, update it to use ../\_shared/deps.ts instead. See references/versions.md for version rationale.

Deployment

# Deploy single function
supabase functions deploy function-name

# Deploy via MCP
mcp__supabase__deploy_edge_function

Testing

# Local testing
supabase functions serve function-name

# cURL test
curl -X POST https://PROJECT.supabase.co/functions/v1/function-name \
  -H "Authorization: Bearer ANON_KEY" \
  -H "Content-Type: application/json" \
  -d '{"key": "value"}'

Agent Skills: Edge Function Generator

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Skill Files