csp-and-trusted-urls
Configure Content Security Policy via Trusted URLs and CSP Trusted Sites so Lightning, LWR, and LWC can call third-party scripts, APIs, and frame sources. NOT for clickjack configuration.
Best use case
csp-and-trusted-urls is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Configure Content Security Policy via Trusted URLs and CSP Trusted Sites so Lightning, LWR, and LWC can call third-party scripts, APIs, and frame sources. NOT for clickjack configuration.
Teams using csp-and-trusted-urls should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/csp-and-trusted-urls/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How csp-and-trusted-urls Compares
| Feature / Agent | csp-and-trusted-urls | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Configure Content Security Policy via Trusted URLs and CSP Trusted Sites so Lightning, LWR, and LWC can call third-party scripts, APIs, and frame sources. NOT for clickjack configuration.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# CSP and Trusted URLs
Salesforce enforces strict CSP for Lightning and LWR. External scripts, connect-src targets, and frame-src must be allow-listed via Trusted URLs (Setup → Security → Trusted URLs). This skill maps each context (Lightning Experience, Experience Cloud LWR, Lightning Communities) to the right directive.
## Recommended Workflow
1. Identify the failing directive: connect-src, script-src, img-src, frame-src, font-src.
2. Setup → Trusted URLs → New. Enter the URL, context (Lightning Experience / Experience Cloud LWR / Communities), and check the relevant directive boxes.
3. Reload the page; verify the console CSP violation is gone.
4. Document the external dependency in your architecture diagram + security review.
5. Remove entries quarterly when features are retired.
## Key Considerations
- Trusted URL is per context — a URL trusted in LEX is not automatically trusted in LWR.
- script-src with inline handlers (onclick=) is not allowed; refactor to LWC event listeners.
- Remote Site Settings govern Apex callouts; Trusted URL governs browser-side fetch.
- Salesforce generates a hash for each CSP-allowed script; use the SFDC-provided cdn when possible to reduce allow-list size.
## Worked Examples (see `references/examples.md`)
- *Add Stripe.js to an LWC checkout* — B2C LWR site.
- *Call internal analytics API from Lightning* — LEX dashboard.
## Common Gotchas (see `references/gotchas.md`)
- **Wildcard subdomains** — https://*.corp.com trusts unintended hosts.
- **LWR vs. LEX confusion** — Same URL added for wrong context silently fails.
- **CDN churn** — Script URL changes version and the allow-list breaks.
## Top LLM Anti-Patterns (full list in `references/llm-anti-patterns.md`)
- Using wildcards 'https://*'
- Disabling CSP ('Relaxed CSP') to ship faster
- Allow-listing a script URL without also allow-listing its connect-src dependencies
## Official Sources Used
- Apex Developer Guide — Sharing — https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_bulk_sharing_understanding.htm
- Salesforce Security Guide — https://help.salesforce.com/s/articleView?id=sf.security.htm
- Shield Platform Encryption — https://help.salesforce.com/s/articleView?id=sf.security_pe_overview.htm
- Session Security Levels — https://help.salesforce.com/s/articleView?id=sf.security_hap_session.htm
- CSP and Trusted URLs — https://help.salesforce.com/s/articleView?id=sf.security_csp_overview.htm
- API Only User Profile — https://help.salesforce.com/s/articleView?id=sf.users_profiles_api_only.htm
- Privacy Center and DSR — https://help.salesforce.com/s/articleView?id=sf.privacy_center_overview.htmRelated Skills
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