api-onboarding

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Summary

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SKILL.md

Reducing Time-to-First-API-Call

When to Use

Use this skill when you need reduce time-to-first-API-call (TTFAC) by optimizing every step of the developer onboarding journey. This skill covers authentication simplification, sandbox environments, interactive documentation, and identifying and eliminating common failure points. Trigger phrases: "API...

The time between a developer discovering your API and successfully making their first call is the most critical window in your entire developer journey. Every minute of friction here costs you potential users.

Overview

Time-to-First-API-Call (TTFAC) is the single most predictive metric for developer adoption. Developers who succeed quickly become active users. Developers who struggle leave—often silently.

This skill covers:

Measuring and optimizing TTFAC
Removing authentication friction
Creating effective sandbox environments
Building interactive documentation
Identifying and fixing common failure points

Before You Start

Review the developer-audience-context skill to understand:

What's the typical technical sophistication of your developers?
What tools and environments do they commonly use?
What alternative products have they tried? What was their experience?
What's their urgency level? (Evaluating vs. building immediately)

Your onboarding should meet developers where they are.

Understanding TTFAC

What TTFAC Measures

Time-to-First-API-Call measures the elapsed time from a developer's first interaction to their first successful API response. This includes:

Discovery time: Finding the "Get Started" content
Signup time: Creating an account
Credential time: Obtaining API keys
Setup time: Installing SDK, configuring environment
: Running first request

Rating	TTFAC	Developer Experience
Excellent	< 5 min	"This is amazing"
Good	5-15 min	"Pretty straightforward"
Acceptable	15-30 min	"Got there eventually"
Poor	30-60 min	"This is frustrating"
Failing	> 60 min	"I'll try something else"

// Track these events with timestamps
analytics.track('docs_quickstart_viewed');
analytics.track('signup_started');
analytics.track('signup_completed');
analytics.track('api_key_created');
analytics.track('sdk_installed');     // Via package manager data
analytics.track('first_api_call');    // Via API logs
analytics.track('first_successful_call');

❌ "Your API access request has been submitted.
    You'll receive access within 2-3 business days."

❌ Settings → Team → API → Credentials → Keys → Show Key

❌ OAuth flow requiring:
   - Client ID
   - Client secret
   - Redirect URI configuration
   - Token exchange
   - Token refresh handling

❌ Sign up → Verify email → Verify phone →
   Add payment → Verify payment → Then API key

✅ "Here's your test API key: sk_test_abc123...
    Use this in sandbox mode—no charges, no setup."

✅ Quickstart: API key header
   Production: OAuth when they need it

✅ # Your API key is pre-filled in these examples
   curl -H "Authorization: Bearer sk_test_YOUR_KEY" ...

✅ Test mode: Instant access
   Production mode: Add payment, verify identity (later)

Production: api.example.com
Sandbox:    sandbox-api.example.com

Production key: sk_live_abc123...
Sandbox key:    sk_test_xyz789...

curl -X POST https://api.example.com/v1/messages \
  -H "Authorization: Bearer $API_KEY" \
  -d '{"sandbox": true, ...}'

// Sandbox comes with test users
const testUsers = await client.users.list();
// Returns: [
//   { id: "usr_test_alice", name: "Alice (Test)" },
//   { id: "usr_test_bob", name: "Bob (Test)" }
// ]

// Special values trigger specific behaviors
client.payments.create({
  amount: 1000,
  card: "4242424242424242"  // Always succeeds
});

client.payments.create({
  amount: 1000,
  card: "4000000000000002"  // Always declines
});

## Test Card Numbers

| Number           | Behavior              |
|-----------------|----------------------|
| 4242424242424242 | Successful charge    |
| 4000000000000002 | Declined             |
| 4000000000009995 | Insufficient funds   |
| 4000000000000069 | Expired card         |

<div class="api-explorer">
  <h3>Try it: Send a Message</h3>

  <div class="request-editor">
    <label>To Phone Number</label>
    <input type="text" value="+15551234567" />

    <label>Message Body</label>
    <textarea>Hello from the API Explorer!</textarea>

    <button onclick="sendRequest()">Send Request</button>
  </div>

  <div class="response-viewer">
    <h4>Response</h4>
    <pre><code id="response"></code></pre>
  </div>
</div>

## Interactive Tutorial: Send Your First Message

### Step 1: Check your balance
<api-explorer endpoint="GET /account/balance" />

### Step 2: Send a message
<api-explorer endpoint="POST /messages"
  body='{"to": "+15551234567", "body": "Hello!"}' />

### Step 3: Check message status
<api-explorer endpoint="GET /messages/{id}"
  params='{"id": "{{previous.id}}"}' />

// Instrument error events
api.on('request_error', (error, request) => {
  analytics.track('api_error', {
    error_type: error.type,
    error_code: error.code,
    endpoint: request.endpoint,
    time_since_signup: timeSinceSignup(),
    is_first_call: isFirstCall()
  });
});

Problem: Wrong key, malformed header, missing auth
Fix:
- Clearer error messages: "API key should start with 'sk_test_'"
- Pre-filled code examples with actual key
- Auth header format shown with example

Problem: Wrong content type, malformed JSON, missing fields
Fix:
- Accept flexible content types on simple endpoints
- Return specific field-level errors
- Show exactly what was expected vs. received

Problem: SDK not installed, wrong SDK version, missing dependencies
Fix:
- Version-specific installation instructions
- Compatibility matrix clearly visible
- Quick environment check script

Problem: Aggressive rate limits during exploration
Fix:
- Generous sandbox limits (or none)
- Clear rate limit errors with retry-after
- Don't count failed requests against limits

Problem: Firewall, proxy, SSL issues
Fix:
- Connectivity test endpoint
- Clear networking troubleshooting guide
- Alternative ports/protocols if possible

{
  "error": {
    "type": "authentication_error",
    "message": "Invalid API key provided",
    "code": "invalid_api_key",
    "recovery": {
      "steps": [
        "Check that your API key starts with 'sk_test_' or 'sk_live_'",
        "Ensure there are no extra spaces or newlines",
        "Generate a new key at https://dashboard.example.com/keys"
      ],
      "docs": "https://docs.example.com/authentication",
      "support": "https://support.example.com/auth-issues"
    }
  }
}

Friction	Impact	Priority
Must verify email before API key	High	Fix immediately
API key buried in settings	High	Fix immediately
No copy button on code examples	Medium	Fix this quarter
Quickstart assumes specific OS	Medium	Fix this quarter
Example uses outdated SDK version	Low	Fix when updating docs

api-onboarding

Summary

Reducing Time-to-First-API-Call

When to Use

Overview

Before You Start

Understanding TTFAC

What TTFAC Measures

TTFAC Benchmarks

Measuring TTFAC

Authentication Simplification

The Ideal Auth Flow

Auth Anti-Patterns to Avoid

Auth Simplification Strategies

Sandbox Environments

Sandbox Requirements

Sandbox Implementation Patterns

Sandbox Data

Interactive Documentation

"Try It" Functionality

Interactive Docs Tools

Interactive Examples

Common Failure Points

Failure Point Analysis

Most Common First-Call Failures

Error Recovery Flows

The First-Call Experience Audit

Audit Checklist

Friction Point Scoring

Onboarding Optimization Framework

Step 1: Measure Current State

Step 2: Reduce Steps

Step 3: Accelerate Remaining Steps

Step 4: Recover Failures

Step 5: Measure and Iterate

Tools

Onboarding Analytics

Interactive Docs

Testing

Related Skills

Limitations

Related skills