prism-mem: Cursor rule for Cursor

.cursorrules

cursorrules is a cursor rule for Cursor from rahult18/prism-mem. It costs 343 tokens per session, scanned A, a copy of smolagents_rules, MIT.

A Cursor rules file containing project-specific instructions for Prism-Mem, a system that builds a connected knowledge graph from coding sessions. It documents the project’s purpose, tools, architecture, and key components.

In plain words
What is it for?
Use it while developing Prism-Mem features such as reading session histories, extracting relationships, creating links, storing embeddings, and scoring results.
Why use it?
It gives Cursor consistent guidance about how this particular project is structured and how its code should work.

Cursor rule for Cursor

Written for Cursor: installed under .cursor/. Also seen: reads .claude/ paths; mentions subagents; mentions Cursor.

This is rahult18/prism-mem's own configuration. It tells Cursor how to work on prism-mem itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything prism-mem configures →

Reuse

Borrowing it

Nothing to install: this file belongs to rahult18/prism-mem. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/rahult18/prism-mem/main/.cursorrules
Clone the repo
git clone --depth 1 https://github.com/rahult18/prism-mem

Made for: Cursor.

Wrote 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.

agentmods badge for cursorrules

README.md
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Your own site
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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.

agentmods 80×15 button for cursorrules

Your own site · 80×15
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Per session 343 This file is loaded in full into every session.
When invoked 343 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00343 $0.00343
Opus 5.5 $0.00137 $0.00137
Sonnet 5.5 $0.00069 $0.00069
Haiku 4.5 $0.00034 $0.00034

Measured 1mo ago against content hash aafba005a113, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cursorrules 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 1mo 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.

Origin

This is a copy

100% identical to smolagents_rules — 40 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursorrules · 39 lines

What it actually says

# Cursor Rules for Prism-Mem Project

## Project Purpose
- Build a knowledge graph generation system that extracts and links structured triples from coding sessions
- Store session transcripts and maintain persistent knowledge state across Claude interactions

## Key Technology Stack
- Use Claude/Haiku API via LiteLLM for triple extraction
- Use SQLite with sqlite-vec extension for embeddings storage
- Use transformer models for generating embeddings
- Store sessions in ~/.claude/history.jsonl and ~/.claude/projects/*.jsonl files

## Architecture Rules
- Implement extraction in phases, with Phase 4 following Phase 3 and Phase 7 (constitution generator) at the end
- Use session_reader.py to extract sessionId from transcripts
- Use git_reader.py to implement read_git_diff for source analysis
- Store all knowledge graphs in prism-mem located at Desktop/Projects

## Key Components
- extractor module calls Haiku API and produces Graph.relations
- Use link_triple to call create_edge() when connecting entities
- Apply similarity threshold during entity linking phase
- Phase 7 scores all generated triples

## Authentication & API
- Authenticate Anthropic API with ANTHROPIC_API_KEY environment variable
- Pass prompts to _call_haiku for model inference

## Session Management
- Subagent sessions maintain separate .jsonl files in ~/.claude directory
- Subagents produce tool_result objects for parent agent consumption
- Parse JSON objects with attachment field for file/context references

## Code Conventions
- Never hardcode API keys; use environment variables
- Always validate Graph.relations output from kg-gen phases
- Use role="user" for session differentiation where applicable
Changes

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.

  1. 1mo ago First seen · 39 lines · 343 tokens per session scan A aafba005a113

Subscribe to this mod's changes

cursorrules is a cursor rule published in the GitHub repository rahult18/prism-mem (3 stars, last pushed 4mo ago), licensed MIT. It adds 343 tokens to every session, about $0.0014 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to smolagents_rules, differing in 40 lines, and is treated as a copy.