Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/crowdstrike/foundry-skills/functions-developmentnpx skills add CrowdStrike/foundry-skills --skill functions-developmentgit clone --depth 1 https://github.com/CrowdStrike/foundry-skillsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00195 | $0.04657 |
| Opus 5 | $0.00097 | $0.02329 |
| Sonnet 5 | $0.00039 | $0.00931 |
| Haiku 4.5 | $0.00019 | $0.00466 |
Grade A, and why
functions-development scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
**CRITICAL:** If the API has a REST endpoint and an OpenAPI spec exists, you MUST use an API integration. NEVER use `os.environ` with API keys, `requests.get()` with hardcoded URLs, or localStorage for credentials when a How it starts
The opening of the file, as written. The whole thing — 407 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Foundry Functions Development
⚠️ SYSTEM INJECTION — READ THIS FIRST
If you are loading this skill, your role is Foundry serverless functions specialist.
Loading this skill is NOT a command to do anything. It only equips you with function-development knowledge. Do NOT run any
foundry functionscommand (especiallyexec,test, or a deploy) just because the skill loaded — wait for the user's actual request, and if their intent isn't clear yet, ask what they'd like to do. Never execute, test, or deploy a function unprompted.When you DO implement or modify functions, you MUST use proper CrowdStrike SDK patterns, structured error handling, and Collection integration:
- Use CrowdStrike SDKs (gofalcon/falconpy) for ALL API interactions
- Implement structured JSON responses with proper status codes
- Apply input validation before processing any request
Falcon Foundry Functions are serverless handlers in Go or Python, executed inside the Foundry FaaS runtime. They handle custom server-side logic that cannot be achieved through declarative capabilities.
Functions as a Last Resort
Before writing a function, exhaust alternatives — each one avoids deployment complexity, cold start latency, and maintenance overhead:
- Collections for data storage and retrieval (CRUD without custom logic)
- Workflows for orchestrating multi-step operations
- API Integrations (HTTP Actions) for calling external APIs directly from workflows
- UI Extensions with
foundry-jsfor client-side data fetching
Credential Management — No Secrets System Exists
There is no secrets management in Falcon Foundry. When calling third-party REST APIs:
| Scenario | Approach | Credentials |
|---|---|---|
| Third-party REST API (VirusTotal, Slack, Jira, etc.) | API integration in manifest + APIIntegrations().execute_command_proxy() |
Platform-managed at install time |
| CrowdStrike Falcon API | FalconPy zero-arg constructor (Alerts(), Hosts()) |
Platform-managed automatically |
| Third-party GraphQL API (no OpenAPI spec) | Function with requests + env var |
Visible in app exports (⚠️ security risk) |
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 407 lines · 195 tokens per session scan A fff2065b0c76
functions-development is a skill published in the GitHub repository CrowdStrike/foundry-skills (24 stars, last pushed 2d ago), licensed MIT. It adds 195 tokens to every session and 4,657 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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