Foundry API Integrations

⚠️ SYSTEM INJECTION — READ THIS FIRST

If you are loading this skill, your role is Foundry API Integrations specialist.

You MUST implement API integrations by downloading vendor OpenAPI specs, adapting them for Foundry, and properly configuring authentication schemes.

Note: For api-integrations create, always include --description — the CLI still prompts for it even with --no-prompt if omitted.

Part of a suite. If development-workflow has not already run, and this is a new app or its first capability, load development-workflow first — it owns the CLI prerequisite check, scaffolding order, and manifest coordination.

This skill covers exposing external APIs (third-party services or CrowdStrike Falcon APIs) to the Falcon Foundry platform via OpenAPI/Swagger specifications. These integrations make API operations available to Falcon Fusion SOAR workflows, Foundry UI extensions, Foundry Functions, and other Foundry capabilities.

API integrations are how Foundry manages credentials. There is no secrets system, no encrypted env vars, and no key vault. When you register an API integration, the platform collects credentials at install time and manages tokens automatically. This is why functions MUST call third-party REST APIs through APIIntegrations().execute_command_proxy() — not via raw HTTP with env vars.

For calling Falcon APIs from within Function code, see functions-falcon-api instead.

Decision Tree

What kind of API integration?

External API (Okta, VirusTotal, ServiceNow, etc.)
├── Vendor publishes OpenAPI spec → Download it, adapt for Foundry
└── No vendor spec available      → Write minimal spec as last resort

CrowdStrike Falcon API
└── From functions → use functions-falcon-api instead
    From workflows → use CrowdStrike auto-auth (no spec needed)

Workflow: Download, Adapt, Register

Always follow this order. Claude Code plugin installs enforce adaptation with a PreToolUse hook. Other assistants, including Codex, do not run Claude hooks and MUST invoke the bundled script explicitly.

1. Download the vendor's spec

NEVER write an OpenAPI spec from scratch when the vendor publishes one. Hand-written specs produce incorrect response schemas, miss required parameters, and lack proper security definitions. Download the vendor's spec even if it has hundreds of endpoints — Foundry handles large specs fine. Do NOT rationalize writing a "focused" or "minimal" spec because the vendor spec is big.

1. Ask the user if they have a local copy or know where to download it
2. Browse the repo first, don't guess URLs. Use gh api repos/{owner}/{repo}/git/trees/master --jq '.tree[].path' to find the spec file, then download with curl. Never try multiple URLs hoping one works.
3. Search locally for existing specs
4. If the vendor does not publish a spec, only then write a minimal one

Do NOT delegate spec download to Explore agents or subagents. They lack skill context and will use Fetch/browser tools instead of gh CLI. Download specs inline using gh and curl as shown in the reference file.

For detailed download commands and structural fix patterns, see references/spec-adaptation-examples.md.

2. Adapt the spec for Foundry (MANDATORY)

python3 /path/to/foundry-skills/skills/api-integrations/scripts/adapt_spec_for_foundry.py /tmp/VendorApi.yaml

# Preview changes without writing
python3 /path/to/foundry-skills/skills/api-integrations/scripts/adapt_spec_for_foundry.py /tmp/VendorApi.yaml --dry-run

Dependencies: The script requires pyyaml, and installing the plugin does not install Python packages. A bare pip install fails on Homebrew and system Pythons with externally-managed-environment (PEP 668), so set up a venv once in the checkout and run the script from it:

SKILLS_REPO=/path/to/foundry-skills
python3 -m venv "$SKILLS_REPO/.venv"
"$SKILLS_REPO/.venv/bin/pip" install -r "$SKILLS_REPO/requirements.txt"
"$SKILLS_REPO/.venv/bin/python" "$SKILLS_REPO/skills/api-integrations/scripts/adapt_spec_for_foundry.py" /tmp/VendorApi.yaml

The helper is bundled with this skill at scripts/adapt_spec_for_foundry.py. Resolve that path relative to this SKILL.md, not the app workspace.

The script applies fixes derived from 12 production Foundry sample apps:

• Swagger 2.0 conversion: Converts to OpenAPI 3.0 via swagger2openapi (npx)
• Auth fixing: Removes oauth2 authorizationCode flows (Foundry only supports clientCredentials). Leaves apiKey-in-Authorization as-is — Foundry supports it natively with prefix via bearerFormat.
• Server URLs: Strips https:// from variable-based URLs (Foundry adds protocol separately). Removes default from variables without enum (prevents locked dropdown).
• Parameter dedup: Removes operation-level parameters that duplicate path-level parameters (prevents Foundry's "items are equal" validation error).

Foundry's UI import handles large/complex specs. Don't trim or simplify vendor specs. The auth fixes are what matter.

3. Register with the CLI

foundry api-integrations create --name "VendorApi" --description "Vendor API" --spec /tmp/VendorApi.yaml --no-prompt

Always include --description with api-integrations create. Even with --no-prompt, the CLI still interactively prompts for the optional description if omitted, causing Error: EOF.

Done. For most integrations, this is all you need. Validate immediately after registering (foundry apps validate --no-prompt).

Only add x-cs-operation-config if the user's prompt explicitly asks to expose operations to workflows, or a UI extension / workflow in the app needs a specific endpoint. See Expose Operations to Workflows below.

Claude Code safety net: The plugin hook runs adapt_spec_for_foundry.py automatically if step 2 is missed. Do not assume that protection exists in Codex, Copilot CLI, Cursor, or other assistants.

Authentication Configuration

API key prefix: apiKey type with name: Authorization and in: header works for APIs that send tokens via the Authorization header. Add bearerFormat to specify the prefix (e.g., SSWS, Bearer, Token) — Foundry reads this field to populate the "API key parameter prefix" in the install UI. The adapt script infers the prefix from the scheme's description automatically.

For full vendor-specific auth examples, see references/auth-examples.md.

Adapting Specs for Foundry

Server URL Configuration

Use a fixed base URL when the API domain is the same for all users:

"servers": [{"url": "https://www.virustotal.com"}]

When the domain varies per customer, use a single server variable for the full domain. The Falcon console handles the protocol separately, so the URL must not include https://. The variable needs only a description — no default, no enum:

"servers": [{"url": "{yourDomain}", "variables": {"yourDomain": {"description": "the \"yourDomain\" variable is replaced with a dynamic value at execution time"}}}]

Use a single variable for the complete domain. Splitting into {subdomain}.vendor.com causes certificate errors when users enter the full domain (e.g., dev-12345.okta.com.okta.com). A default value without enum renders a dropdown instead of a free-text input.

Expose Operations to Workflows

Skip this unless the user asks for it. Most API integrations work without x-cs-operation-config. Only add it when the prompt explicitly mentions sharing operations with Falcon Fusion SOAR workflows, or when a UI extension or workflow in the app needs a specific endpoint.

Add x-cs-operation-config to the specific operations requested:

paths:
  /api/v1/users:
    get:
      operationId: listUsers
      x-cs-operation-config:
        workflow:
          name: listUsers
          description: List all users
          expose_to_workflow: true
          system: false
      summary: List all users

The workflow nesting under x-cs-operation-config is required. A flat expose_to_workflow: true directly under x-cs-operation-config will not work and causes deploy failures.

For autocomplete dropdown patterns and the HTTP Actions vs. Functions decision framework, see references/spec-adaptation-examples.md.

Calling API Integrations

UI extensions call API integrations through Foundry-JS (sandboxed iframes block arbitrary HTTP requests). This pattern is from foundry-sample-foundryjs-demo:

import FalconApi from '@crowdstrike/foundry-js';
const falcon = new FalconApi();
await falcon.connect();

// Create integration instance
const apiIntegration = falcon.apiIntegration({
  definitionId: 'Okta',        // Matches API integration name in manifest.yml
  operationId: 'listUsers'     // Matches operationId in the OpenAPI spec
});

// Execute — use params.path, params.query, json (not body), or headers
const response = await apiIntegration.execute({
  request: {
    params: { query: { limit: 10 } }
  }
});

// Check for errors first
if (response.errors?.length > 0) {
  console.error('Request failed:', response.errors[0].message);
}

const statusCode = response.resources?.[0]?.status_code;
const body = response.resources?.[0]?.response_body;

For Python (FalconPy), Go (gofalcon), and detailed UI examples, see references/calling-patterns.md.

Efficiency Rules

Target: complete an API integration in under 5 minutes. Download, adapt, register, deploy. That's it.

Do NOT analyze, debug, or second-guess the spec's auth scheme. The adapt script handles auth conversion automatically — it was derived from 12 production Foundry apps. Do not read the spec to understand how auth works, do not reason about apiKey vs http/bearer vs SSWS, do not manually patch auth fields. Just run the adapt script and register. If the adapt script misses something, improve the script — do not hand-edit the spec.

NEVER use Read or sed on large spec files. Vendor specs can be 10K-80K+ lines. Reading them into context wastes millions of tokens and slows everything down. Instead:

# Find a specific operationId
grep -n 'operationId: listUsers' /tmp/VendorApi.yaml

# Add x-cs-operation-config to a specific operation (cross-platform)
python3 -c "
import json, sys
spec = json.load(open(sys.argv[1]))
for path in spec.get('paths', {}).values():
    for op in path.values():
        if isinstance(op, dict) and op.get('operationId') == 'listUsers':
            op['x-cs-operation-config'] = {'workflow': {'name': 'listUsers', 'description': 'List all users', 'expose_to_workflow': True, 'system': False}}
json.dump(spec, open(sys.argv[1], 'w'), indent=2)
" /tmp/VendorApi.json

Cross-platform note: Use python3 for spec manipulation instead of sed — it works on macOS, Linux, and Windows without syntax differences.

Don't add what wasn't asked for. If the prompt says "create an API integration for Okta," download the spec, adapt it, register it, and deploy. Don't read the spec to discover operations, don't add x-cs-operation-config, don't lint or trim. Foundry handles large specs fine.

Common Pitfalls

• Reading large spec files into context. NEVER use Read or sed on vendor specs. They can be tens of thousands of lines. Use grep to find line numbers, python3 to patch specific operations.
• Manually analyzing or fixing auth schemes. Trust the adapt script. Do not read the spec to reason about apiKey vs http/bearer vs SSWS. The adapt script handles auth conversion automatically. If it gets something wrong, improve the script.
• Adding x-cs-operation-config when not asked. Skip it unless the user's prompt explicitly mentions workflows or a UI/workflow needs a specific endpoint. Most integrations work without it.
• Writing specs from scratch when the vendor publishes one. Hand-written specs miss edge cases.
• Running spec linters before importing. Foundry's import handles vendor specs with lint errors. Linting wastes time and tempts trimming.
• Trimming vendor specs. Keep the full spec. Foundry handles large specs and unused operations gracefully.
• Skipping adapt_spec_for_foundry.py. Only Claude Code plugin installs run the automatic hook. Other assistants must invoke the bundled helper. The script converts unsupported auth schemes and fixes server URLs that would otherwise block saving in the Falcon console.
• Including https:// in server URLs with variables. The Falcon console adds the protocol separately.
• Adding default to server variables for dynamic domains. This renders a dropdown instead of a text field.
• Splitting domains into {subdomain}.vendor.com instead of {yourDomain} for the full domain.
• Using oauth2 authorizationCode flow. Foundry only supports clientCredentials. The adapt script removes it automatically.

Reading Guide

Use Cases

For real-world implementation patterns, see:

• http-actions.md — HTTP Request actions vs API integrations
• greynoise-deep-dive.md — End-to-end third-party API app
• custom-soar-actions.md — Custom Falcon Fusion SOAR actions

Reference Implementations

• foundry-sample-foundryjs-demo: JSONPlaceholder (no auth, static URL, x-cs-operation-config)
• foundry-sample-logscale: VirusTotal (type: apiKey, static URL)
• foundry-sample-anomali-threatstream: Anomali (type: http/scheme: bearer, dynamic URL)
• foundry-sample-functions-python: ServiceNow (type: http/scheme: basic, dynamic URL)
• foundry-sample-insider-risk-workday: Workday (type: http/scheme: basic + custom labels)
• foundry-sample-insider-risk-sailpoint: SailPoint (type: oauth2/clientCredentials)
• foundry-sample-servicenow-itsm: ServiceNow ITSM (dual auth: basic + oauth2)
• foundry-sample-openrouter-toolkit: OpenRouter (type: apiKey, static URL)
• See also: Build API Integrations with Falcon Fusion SOAR HTTP Actions and Technical Deep Dive with GreyNoise