A communication rule that makes an agent answer in very few words while keeping technical details. It can switch between shorter levels and return to normal wording when clarity matters.

Use it for concise debugging explanations, plans, and next steps. It also defines when to use normal language, such as for security warnings or irreversible actions.

It removes greetings, filler, and unnecessary wording from technical replies. This makes answers faster to scan without asking the agent to simplify the technical content.

caveman — Cursor rule for Cursor by BlackbirdWorks/gopherstack

Install

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.

Clone the repo

git clone --depth 1 https://github.com/BlackbirdWorks/gopherstack

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.

README.md

[![agentmods](https://agentmods.dev/badge/rules/blackbirdworks/gopherstack/caveman/github.svg)](https://agentmods.dev/rules/blackbirdworks/gopherstack/caveman)

Your own site

<a href="https://agentmods.dev/rules/blackbirdworks/gopherstack/caveman"><img src="https://agentmods.dev/badge/rules/blackbirdworks/gopherstack/caveman/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.

Your own site · 80×15

<a href="https://agentmods.dev/rules/blackbirdworks/gopherstack/caveman"><img src="https://agentmods.dev/badge/rules/blackbirdworks/gopherstack/caveman.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 191 This file is loaded in full into every session.

When invoked 191 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.

Model	Per session	Once invoked
Fable 5.1	$0.00191	$0.00191
Opus 5.5	$0.00076	$0.00076
Sonnet 5.5	$0.00038	$0.00038
Haiku 4.5	$0.00019	$0.00019

Measured yesterday against content hash 669ccde24557, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

caveman 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 yesterday.

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 caveman — 0 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.

.cursor/rules/caveman.mdc · 21 lines

What it actually says

Respond terse like smart caveman. All technical substance stay. Only fluff die.

Rules:

Drop: articles (a/an/the), filler (just/really/basically), pleasantries, hedging
Fragments OK. Short synonyms. Technical terms exact. Code unchanged.
Pattern: [thing] [action] [reason]. [next step].
Not: "Sure! I'd be happy to help you with that."
Yes: "Bug in auth middleware. Fix:"

Switch level: /caveman lite|full|ultra|wenyan Stop: "stop caveman" or "normal mode"

Auto-Clarity: drop caveman for security warnings, irreversible actions, user confused. Resume after.

Boundaries: code/commits/PRs written normal.

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.

yesterday First seen · 21 lines · 191 tokens per session scan A 669ccde24557

Subscribe to this mod's changes

caveman is a cursor rule published in the GitHub repository BlackbirdWorks/gopherstack (17 stars, last pushed yesterday), licensed MIT. It adds 191 tokens to every session, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to caveman, differing in 0 lines, and is treated as a copy.

Productivity aws localstack terraform

caveman next to 6 cursor rules from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
cavemanBlackbirdWorks/gopherstack	Cursor rule	17	yesterday	MIT	A	191	Cursor
git-workflowgrafana/grafana-cube-datasource	Cursor rule	20	today	AGPL-3.0	A	616	Cursor
feedback-enhancedMr-chen-05/rules-2.1-optimized	Cursor rule	172	1y ago	MIT	A	2,968	Cursor
kiss-ponytailkellerza/hass-addons	Cursor rule	9	today	Apache-2.0	A	599	Cursor
122-swift-developmentn0rvyn/cursor-rules	Cursor rule	2	11mo ago	none	A	0	Cursor
ponytailDietrichGebert/ponytail	Cursor rule	186k	9d ago	MIT	A	604	Cursor
angular-20angular/angular	Cursor rule	101k	today	MIT	A	0	Cursor