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cortex: Instructions file for Claude Code

.github/copilot-instructions.md

cortex copilot-instructions.md is an instructions file for Claude Code, GitHub Copilot from CortexPrism/cortex. It costs 10,877 tokens per session, scanned C, original, Apache-2.0.

Workspace instructions for CortexPrism’s Cortex project and its ContextStream memory system. They define required startup, context, search, and session tool calls for keeping work grounded.

In plain words
What is it for?
Use them when starting or continuing Cortex work, loading project context, searching files, recording plans, and following ContextStream session rules.
Why use it?
They make the agent follow the project’s required context and memory workflow instead of relying only on the current chat. This helps preserve relevant project information across work sessions.

Instructions file for Claude CodeGitHub Copilot

Written for Claude Code and GitHub Copilot: PreToolUse hook event, but also a Copilot instructions file. Also seen: reads .claude/ paths; mentions CLAUDE.md; mentions subagents.

This is CortexPrism/cortex's own configuration. It tells Claude Code and GitHub Copilot how to work on cortex 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 cortex configures →

not rated 147repo +2 4mo ago C scan 10,877 tokens original Apache-2.0
View source ↗ CortexPrism/cortex cortexprism.io
Reuse

Borrowing it

Nothing to install: this file belongs to CortexPrism/cortex. 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/CortexPrism/cortex/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/CortexPrism/cortex

Made for: Claude Code, GitHub Copilot.

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.

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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 cortex copilot-instructions.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/cortexprism/cortex/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/cortexprism/cortex/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 10,877 This file is loaded in full into every session.
When invoked 10,877 The same file — it is already loaded in full.
Security scan C 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found 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 $0.10877 $0.10877
Opus 5.5 $0.04351 $0.04351
Sonnet 5.5 $0.02175 $0.02175
Haiku 4.5 $0.01088 $0.01088

Measured 2mo ago against content hash 31235c4d87bd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

cortex copilot-instructions.md scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -fsSL https://contextstream.io/scripts/setup.sh | bash

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -fsSL https://contextstream.io/scripts/setup.sh | bash
.github/copilot-instructions.md · 822 lines

How it starts

The opening of the file, as written. The whole thing — 822 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ContextStream Rules

MANDATORY STARTUP: On the first message of EVERY session call init(...). Then call context(user_message="...") when that tool is exposed; if context is unavailable in this MCP surface, call session(action="ground", user_message="...") instead. On subsequent messages, call context(...) first by default, or session(action="ground", user_message="...") when context is unavailable. A narrow bypass is allowed only for immediate read-only ContextStream calls when prior context is still fresh and no state-changing tool has run.

Required Tool Calls

  1. First message in session: Call init(folder_path="<project_path>") then context(user_message="...", session_id="<id>"); if context is unavailable, call session(action="ground", user_message="...")
  2. Subsequent messages (default): Call context(user_message="...", session_id="<id>") first, or session(action="ground", user_message="...") when context is unavailable. Narrow bypass: immediate read-only ContextStream calls with fresh context + no state changes.
  3. Before file search: Call search(mode="auto", query="...") before local tools

Read-only examples (default: call context(...) first when that tool is exposed; if context is unavailable, call session(action="ground", user_message="...") for the same grounding bundle. Narrow bypass only for immediate read-only ContextStream calls when context is fresh and no state-changing tool has run): workspace(action="list"|"get"|"create"), memory(action="list_docs"|"list_events"|"list_todos"|"list_tasks"|"list_transcripts"|"list_nodes"|"decisions"|"get_doc"|"get_event"|"get_task"|"get_todo"|"get_transcript"), session(action="get_lessons"|"get_plan"|"list_plans"|"recall"), media(action="list"|"search"|"status"), help(action="version"|"tools"|"auth"), project(action="list"|"get"|"index_status"), reminder(action="list"|"active"), any read-only data query

Read the full file on GitHub · 822 lines

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. 2mo ago First seen · 822 lines · 10,877 tokens per session scan C 31235c4d87bd

Subscribe to this mod's changes

cortex copilot-instructions.md is an instructions file published in the GitHub repository CortexPrism/cortex (147 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 10,877 tokens to every session, about $0.0435 per session on Opus 5.5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Memory and contextagentic-aiai-agent-operating-systemai-agentsai-osai-toolsautonomous-agent-runtime
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