Why primary sources first
Claude refusal and limitation discourse is noisy. Users share screenshots, influencers publish jailbreak claims, and product behavior changes across surfaces. Primary sources do not answer every question, but they anchor the parts that can be verified: policy text, API fields, model IDs, context limits, official warnings, and published safety evaluations.
This site avoids anonymous prompt lists and unverifiable screenshots at launch. That keeps the content narrower, but more citeable.
How the sources are used
Policy pages explain what the platform may block or require. API docs explain what developers can observe and handle. Research pages explain safety tradeoffs such as jailbreak defense and overrefusal. Help Center pages explain user-facing limitations in plain language. System cards and model docs explain model-specific behavior and release context.
When a claim depends on a current product fact, it should be checked against the linked source again before reuse.
Annotated source cards
Usage Policy
Anthropic - Effective September 15, 2025Defines prohibited uses, high-risk use requirements, enforcement language, and the policy basis for many safety refusals.
Claude's Constitution
Anthropic - Accessed July 6, 2026Explains Anthropic's stated behavioral principles for Claude and why safety behavior is trained into the model rather than only added as a UI rule.
Constitutional AI: Harmlessness from AI Feedback
Anthropic Research - December 2022Describes the training approach behind rule-guided harmlessness and the helpful-harmless-honest framing.
Constitutional Classifiers: Defending against universal jailbreaks
Anthropic Research - February 3, 2025Documents jailbreak risk, overrefusal tradeoffs, red-team testing, and classifier-based guardrails.
Stop reasons and fallback
Claude Platform Docs - Accessed July 6, 2026Documents API stop reasons including refusals, truncation, tool use, and context-window overflow.
Context windows
Claude Platform Docs - Accessed July 6, 2026Explains what counts toward context, current context sizes, and why long conversations still need token management.
Computer use tool
Claude Platform Docs - Accessed July 6, 2026Warns that Claude can follow instructions embedded in webpages or images, a core prompt-injection risk for agentic workflows.
Claude is providing incorrect or misleading responses. What's going on?
Claude Help Center - March 16, 2026Plainly states that Claude can hallucinate, produce misleading output, and should not be treated as a single source of truth.
System Prompts
Claude Platform Docs - Accessed July 6, 2026Shows that Claude web and mobile system prompts are published and periodically updated, while API behavior differs.
Model system cards
Anthropic - Accessed July 6, 2026Lists public Claude system cards and frames them as documents about capabilities, safety evaluations, and deployment decisions.
Models overview
Claude Platform Docs - Accessed July 6, 2026Provides current model IDs, context windows, output limits, knowledge cutoffs, and availability notes.
What is new in Claude Sonnet 5
Claude Platform Docs - Accessed July 6, 2026Documents behavior changes such as adaptive thinking, sampling-parameter restrictions, and tokenizer changes.
What is new in Claude Opus 4.8
Claude Platform Docs - Accessed July 6, 2026Documents Opus 4.8 behavior changes, refusal stop details, adaptive thinking, and unsupported sampling parameters.
FAQ
Why not cite Reddit or social media screenshots?
They can be useful leads, but they are weak anchors for a source-backed reference site because context, model version, and surface are often missing.
Are all sources from Anthropic?
Launch content intentionally prioritizes Anthropic and Claude primary sources because the site explains Claude policy, docs, and product behavior.
Primary sources
- Usage Policy Anthropic - Effective September 15, 2025
Defines prohibited uses, high-risk use requirements, enforcement language, and the policy basis for many safety refusals.
- Claude's Constitution Anthropic - Accessed July 6, 2026
Explains Anthropic's stated behavioral principles for Claude and why safety behavior is trained into the model rather than only added as a UI rule.
- Constitutional AI: Harmlessness from AI Feedback Anthropic Research - December 2022
Describes the training approach behind rule-guided harmlessness and the helpful-harmless-honest framing.
- Constitutional Classifiers: Defending against universal jailbreaks Anthropic Research - February 3, 2025
Documents jailbreak risk, overrefusal tradeoffs, red-team testing, and classifier-based guardrails.
- Stop reasons and fallback Claude Platform Docs - Accessed July 6, 2026
Documents API stop reasons including refusals, truncation, tool use, and context-window overflow.
- Context windows Claude Platform Docs - Accessed July 6, 2026
Explains what counts toward context, current context sizes, and why long conversations still need token management.
- Computer use tool Claude Platform Docs - Accessed July 6, 2026
Warns that Claude can follow instructions embedded in webpages or images, a core prompt-injection risk for agentic workflows.
- Claude is providing incorrect or misleading responses. What's going on? Claude Help Center - March 16, 2026
Plainly states that Claude can hallucinate, produce misleading output, and should not be treated as a single source of truth.
- System Prompts Claude Platform Docs - Accessed July 6, 2026
Shows that Claude web and mobile system prompts are published and periodically updated, while API behavior differs.
- Model system cards Anthropic - Accessed July 6, 2026
Lists public Claude system cards and frames them as documents about capabilities, safety evaluations, and deployment decisions.
- Models overview Claude Platform Docs - Accessed July 6, 2026
Provides current model IDs, context windows, output limits, knowledge cutoffs, and availability notes.
- What is new in Claude Sonnet 5 Claude Platform Docs - Accessed July 6, 2026
Documents behavior changes such as adaptive thinking, sampling-parameter restrictions, and tokenizer changes.
- What is new in Claude Opus 4.8 Claude Platform Docs - Accessed July 6, 2026
Documents Opus 4.8 behavior changes, refusal stop details, adaptive thinking, and unsupported sampling parameters.