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.
npx agentmods add skills/markmhendrickson/foundation/create-rulenpx skills add markmhendrickson/foundation --skill create-rulegit clone --depth 1 https://github.com/markmhendrickson/foundationWhat 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 | $0.00011 | $0.01793 |
| Opus 5 | $0.00005 | $0.00897 |
| Sonnet 5 | $0.00002 | $0.00359 |
| Haiku 4.5 | $0.00001 | $0.00179 |
Grade A, and why
create-rule 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.
This is a copy
94% identical to create-rule — 21 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.
How it starts
The opening of the file, as written. The whole thing — 293 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create Rule
Create a new rule file with _rules suffix and automatically create symlink in .cursor/rules/.
SUBMODULE MODE: If a submodule name is provided (e.g., /create-rule foundation), create the rule in that submodule. If no submodule name is provided, create in the main repository's docs/ directory.
Command
create-rule [submodule_name]
Inputs
submodule_name(optional string): Submodule name to create rule in (e.g., "foundation"). If omitted, creates rule in main repository'sdocs/directory.
Workflow Overview
If submodule name provided:
- Verify submodule exists
- Determine submodule rule location
- Prompt user for rule details
- Create rule file in submodule
- Run setup script to create symlink (if applicable)
- Exit after submodule rule creation
If no submodule name provided (default - repo mode):
- Prompt user for rule details
- Create rule file in
docs/{location}/{name}_rules.md - Include standard Agent Instructions template
- Run setup script to create symlink
- Verify symlink created
Tasks
Step 1: Determine Scope
If submodule name provided:
-
Verify submodule exists:
if ! git submodule status <submodule_name> >/dev/null 2>&1; then echo "❌ Submodule not found: <submodule_name>" exit 1 fi -
Determine submodule rule location:
- For
foundationsubmodule:foundation/agent_instructions/cursor_rules/ - For other submodules: Check for standard rule directories or prompt user
- For
-
Set context for submodule rule creation
If no submodule name provided:
- Set context for main repository rule creation in
docs/directory
Step 2: Prompt User for Rule Details
Repository mode prompts:
-
Rule file name (without
_rules.mdsuffix)- Example: "entity_resolution" will become "entity_resolution_rules.md"
- Validate: alphanumeric with underscores only
-
Location in
docs/directory- Options:
conventions,foundation,subsystems,architecture,developer, etc. - Validate: directory must exist or ask to create
- Options:
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 · 293 lines · 11 tokens per session scan A 379b39cdb91c
create-rule is a skill published in the GitHub repository markmhendrickson/foundation (2 stars, last pushed 1mo ago), licensed MIT. It adds 11 tokens to every session and 1,793 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to create-rule, differing in 21 lines, and is treated as a copy.
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