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collections-development

Design JSON Schema collections and CRUD patterns for Falcon Foundry apps. TRIGGER when user asks to "create a collection", "define a JSON schema", "store data in Foundry", runs `foundry collections create`, or needs help with indexable fields, FQL queries, or collection access patterns. DO NOT TRIGGER for workflow YAML, function handlers, or UI components — use the appropriate sub-skill.

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Foundry Collections Development

SYSTEM INJECTION — READ THIS FIRST

If you are loading this skill, your role is Foundry data modeling specialist.

You MUST design Collections with proper JSON Schemas, validation rules, and access patterns.

Falcon Foundry Collections are NoSQL document stores with JSON Schema validation. They provide persistent storage for app data with CRUD operations, FQL queries, and schema enforcement.

Collection Naming Constraints

ConstraintRule
Length5-200 characters
Start/endMust begin and end with a letter or number
Special charactersOnly underscores (_) allowed — no hyphens, spaces, or other chars
CaseCase-sensitive

JSON Schema Requirements

  • JSON Schema draft 7 only — newer drafts (draft/2020-12, draft/2019-09) fail validation
  • Schema is auto-versioned: v1.0 on creation, auto-incremented on modification
  • additionalProperties: false recommended — extra fields leak internal data and break type safety
  • x-cs-indexable: true on individual properties for searchable fields (max 10 per collection)

CLI Scaffolding

# Write schema to /tmp/ first — the CLI copies it into collections/
foundry collections create \
  --name "my_collection" \
  --schema /tmp/schema.json \
  --description "App data store" \
  --no-prompt \
  --wf-expose \
  --wf-tags "tag1,tag2"

This creates the collection directory, copies the schema, and updates manifest.yml. Edit the project copy at collections/my_collection.json afterward to refine.

Collection API Access

Collections are managed via the CrowdStrike API or the foundry-js SDK. There are no CLI commands for reading/writing collection data, and collections can only be deleted from the Falcon Foundry UI (not the CLI).

PUT    /customobjects/v1/collections/{collection_name}/objects/{key}  — Create/update object
GET    /customobjects/v1/collections/{collection_name}/objects/{key}  — Get object by key
DELETE /customobjects/v1/collections/{collection_name}/objects/{key}  — Delete object
POST   /customobjects/v1/collections/{collection_name}/objects        — Search objects (FQL filter)

JSON Schema Patterns

Basic Schema

{
  "$schema": "https://json-schema.org/draft-07/schema#",
  "type": "object",
  "title": "Incident",
  "description": "Security incident record",
  "required": ["id", "title", "severity", "status", "created_at"],
  "additionalProperties": false,
  "properties": {
    "id": { "type": "string", "format": "uuid" },
    "title": { "type": "string", "minLength": 1, "maxLength": 200 },
    "severity": { "type": "integer", "minimum": 1, "maximum": 10 },
    "status": {
      "type": "string",
      "enum": ["open", "investigating", "contained", "resolved", "closed"]
    },
    "tags": {
      "type": "array",
      "items": { "type": "string", "maxLength": 50 },
      "maxItems": 20,
      "uniqueItems": true
    },
    "created_at": { "type": "string", "format": "date-time" }
  }
}

Indexable Fields

Make fields searchable via FQL by marking them indexable. Two patterns are supported:

Pattern A: Top-level array (preferred — used by most foundry-sample repos)

{
  "$schema": "https://json-schema.org/draft-07/schema",
  "x-cs-indexable-fields": [
    { "field": "/status", "type": "string", "fql_name": "status" },
    { "field": "/severity", "type": "integer", "fql_name": "severity" },
    { "field": "/created_at", "type": "string", "fql_name": "created_at" }
  ],
  "type": "object",
  "properties": {
    "status": { "type": "string" },
    "severity": { "type": "integer" },
    "created_at": { "type": "string", "format": "date-time" }
  }
}

Pattern B: Per-field annotation

{
  "properties": {
    "compositeId": { "type": "string", "x-cs-indexable": true },
    "content": { "type": "string" }
  }
}

Both patterns work. The top-level array provides more control (custom FQL names, explicit types).

Manifest Configuration

# manifest.yml
collections:
  - name: incidents
    description: Security incident records
    schema: collections/incidents.json
    permissions: []
    workflow_integration:
      system_action: true
      tags:
        - Collection

  - name: audit_logs
    description: Audit log entries
    schema: collections/audit_logs.json
    permissions: []
    workflow_integration:
      system_action: false
      tags: []

Indexing is controlled entirely by x-cs-indexable-fields or x-cs-indexable: true in the JSON schema files, not in the manifest.

CRUD Operations (TypeScript)

import { Collection } from '@crowdstrike/foundry-js';

export class IncidentCollection {
  private collection: Collection<Incident>;

  constructor() {
    this.collection = new Collection<Incident>('incidents');
  }

  async create(data: Omit<Incident, 'id' | 'created_at' | 'updated_at'>): Promise<Incident> {
    const incident: Incident = {
      ...data,
      id: crypto.randomUUID(),
      created_at: new Date().toISOString(),
      updated_at: new Date().toISOString(),
    };
    await this.collection.create(incident.id, incident);
    return incident;
  }

  async get(id: string): Promise<Incident | null> {
    try {
      return await this.collection.get(id);
    } catch (error) {
      if (error.code === 'NOT_FOUND') return null;
      throw error;
    }
  }

  async update(id: string, updates: Partial<Incident>): Promise<Incident> {
    const existing = await this.get(id);
    if (!existing) throw new Error(`Incident ${id} not found`);
    const updated: Incident = {
      ...existing,
      ...updates,
      id: existing.id,
      created_at: existing.created_at,
      updated_at: new Date().toISOString(),
    };
    await this.collection.update(id, updated);
    return updated;
  }

  async delete(id: string): Promise<void> {
    await this.collection.delete(id);
  }

  async list(options?: { status?: string; limit?: number; offset?: number }) {
    const filters: Record<string, any> = {};
    if (options?.status) filters.status = options.status;
    return this.collection.query(filters, {
      limit: options?.limit ?? 50,
      offset: options?.offset ?? 0,
      sort: [{ field: 'created_at', order: 'desc' }],
    });
  }
}

CRUD Operations (Python — from Functions)

Use CustomStorage (Service Class) to access collections from Python functions. Service classes are preferred over the Uber class (APIHarnessV2) because the Falcon Foundry functions editor auto-detects OAuth scopes from from falconpy import CustomStorage. See functions-development/references/python-patterns.md for a complete handler example with Uber class alternative.

import json
import os
from falconpy import CustomStorage

def _app_headers() -> dict:
    app_id = os.environ.get("APP_ID")
    if app_id:
        return {"X-CS-APP-ID": app_id}
    return {}

client = CustomStorage(ext_headers=_app_headers())

# Create or update (PutObject = upsert). Pass body as a dict.
client.PutObject(collection_name="incidents", object_key="incident-123",
    body={"id": "incident-123", "title": "Suspicious process", "severity": 7})

# Read — GetObject returns bytes on success, dict on error
response = client.GetObject(collection_name="incidents", object_key="incident-123")
# In production, check isinstance(response, bytes) before decoding — see python-patterns.md for full error handling
incident = json.loads(response.decode("utf-8"))

# Delete
client.DeleteObject(collection_name="incidents", object_key="incident-123")

# Search (FQL filter — only indexed fields)
response = client.SearchObjects(collection_name="incidents",
    filter="status:'open'+severity:>=5", limit=50)
# SearchObjects returns metadata — follow up with GetObject per key for full objects
for item in response.get("body", {}).get("resources", []):
    obj = client.GetObject(collection_name="incidents", object_key=item["object_key"])
    data = json.loads(obj.decode("utf-8"))

Key points:

  • CustomStorage(ext_headers=_app_headers()) applies X-CS-APP-ID to all requests (needed for local dev; Foundry sets it automatically in production)
  • PutObject acts as upsert (creates or overwrites by key). Pass body as a dict.
  • GetObject returns bytes directly — decode with json.loads(response.decode("utf-8"))
  • SearchObjects returns metadata only, not full objects
  • FQL filters only work on fields marked x-cs-indexable: true in the collection schema

FQL Search Syntax

Only fields marked with x-cs-indexable: true can be used in FQL queries.

OperationSyntaxExample
Equalityfield:'value'status:'open'
Numeric comparisonfield:>=Nseverity:>=5
ANDfield1:'a'+field2:'b'status:'open'+severity:>=5
ORfield:'a',field:'b'status:'open',status:'investigating'
Wildcardfield:*'pattern'*title:*'malware'*
Sortingsort=field|ascsort=created_at|desc

The foundry-js SDK's search() method accepts a filter parameter for FQL queries. The search endpoint is POST /customobjects/v1/collections/{name}/objects with a filter field in the request body.

Workflow Share Settings

To make a collection accessible from workflows:

collections:
  - name: incidents
    schema: collections/incidents/schema.json
    permissions: []
    workflow_integration:
      system_action: true           # true = app workflows only, false = also available as Fusion SOAR action
      tags:
        - Collection
SettingBehavior
workflow_integration.system_action: trueAvailable to app workflows only
workflow_integration.system_action: falseAvailable to both app workflows AND Falcon Fusion SOAR

RBAC and Direct API Access

Collections can be accessed directly via the CrowdStrike API (outside of functions) using custom roles with specific collection permissions. Include the X-CS-APP-ID header to identify your Foundry app. Foundry CLI credentials cannot access collections directly; use a separate API client with Custom Storage read/write scope.

Common Pitfalls

  • Using APIHarnessV2 (Uber class) for collection operations. Use CustomStorage service class instead — the Foundry functions editor auto-detects OAuth scopes from service class imports but cannot parse Uber class .command() calls.
  • Using JSON Schema newer than draft 7. Foundry only supports draft 7.
  • Missing indexes. Fields used in queries must be marked with x-cs-indexable: true or listed in x-cs-indexable-fields. Max 10 per collection.
  • Invalid collection names. Names must be 5-200 chars, start/end with letter or number, and contain only letters, numbers, and underscores.
  • Not configuring workflow share settings. Set workflow_integration.system_action: true for app-only workflow access, or false to also expose collections as Falcon Fusion SOAR actions.
  • Trying to delete collections via CLI. Collections can only be deleted from the Falcon Foundry UI.
  • Trying to manage objects via CLI. Collection CRUD requires the CrowdStrike API or foundry-js SDK.

Reading Guide

TaskReference
Migrations, testing, pagination, extended schemas, counter-rationalizationsreferences/advanced-patterns.md

Use Cases

For real-world implementation patterns, see:

Reference Implementations

  • foundry-sample-collections-toolkit: CSV import, bulk operations, pagination workflows, test data generation. See also Getting Started with Falcon Foundry Collections.
Repository
CrowdStrike/foundry-skills
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