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.
git clone --depth 1 https://github.com/Hansonli05/Cursor-rules-systemWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/rules/hansonli05/cursor-rules-system/projectbrief)<a href="https://agentmods.dev/rules/hansonli05/cursor-rules-system/projectbrief"><img src="https://agentmods.dev/badge/rules/hansonli05/cursor-rules-system/projectbrief/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/rules/hansonli05/cursor-rules-system/projectbrief"><img src="https://agentmods.dev/badge/rules/hansonli05/cursor-rules-system/projectbrief.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00259 | $0.00259 |
| Opus 5.5 | $0.00104 | $0.00104 |
| Sonnet 5.5 | $0.00052 | $0.00052 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
projectbrief scanned grade A with 0 findings 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 2mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Project Brief
Project Name
[Your Project Name]
Core Purpose
[Brief description of what problem this project solves]
Key Requirements
- [Primary requirement 1]
- [Primary requirement 2]
- [Primary requirement 3]
- [Additional requirements as needed]
Success Criteria
- [How will you know the project is successful?]
- [What are the key metrics or outcomes?]
- [What defines "done" for this project?]
Project Constraints
- [Timeline constraints]
- [Budget constraints]
- [Technical constraints]
- [Resource constraints]
Target Users/Audience
- [Primary user group]
- [Secondary user groups]
- [User personas if relevant]
Key Features (High Level)
- [Feature 1]: [Brief description]
- [Feature 2]: [Brief description]
- [Feature 3]: [Brief description]
Out of Scope
- [What will NOT be included in this project]
- [Features deliberately excluded]
- [Future phase considerations]
Note: This file serves as the foundation for all other memory bank files. Update it when project scope or core requirements change.
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.
- 2mo ago First seen · 49 lines · 259 tokens per session scan A 3420ae423478
projectbrief is a cursor rule published in the GitHub repository Hansonli05/Cursor-rules-system (2 stars, last pushed 1y ago), licensed MIT. It adds 259 tokens to every session, about $0.0010 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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