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 rules/markmhendrickson/foundation/prefer_cli_toolsgit 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 | $0.00030 | $0.01478 |
| Opus 5 | $0.00015 | $0.00739 |
| Sonnet 5 | $0.00006 | $0.00296 |
| Haiku 4.5 | $0.00003 | $0.00148 |
Grade A, and why
prefer_cli_tools scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
3. **Script-based tools** (curl + API, custom scripts) How it starts
The opening of the file, as written. The whole thing — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prefer CLI Tools Rule
Reference: foundation/agent_instructions/cursor_rules/configuration_management.md - Configuration management
Purpose
Ensures agents always prefer CLI tools over dashboard/UI access when checking logs, configuring services, querying data, or performing administrative tasks. CLI tools are more automatable, scriptable, and provide better integration with development workflows.
Trigger Patterns
When any of the following occur, agents MUST use CLI tools instead of dashboard/UI:
- Checking logs (Supabase, SendGrid, application logs)
- Querying databases (Supabase, PostgreSQL)
- Configuring services (Supabase settings, SMTP, environment variables)
- Managing resources (users, projects, deployments)
- Checking status (service health, configuration state)
- Installing dependencies (package managers, tools)
Agent Actions
Step 1: Check for Available CLI Tools
Before suggesting dashboard access, check if CLI tools are available:
-
Check if tool is installed:
which supabase which op which gh which aws -
Check if tool can be installed:
- Package managers:
brew,npm,pip - Official installers
- Documentation for installation
- Package managers:
-
Verify CLI has required functionality:
- Check CLI documentation
- Test basic commands
- Verify authentication/configuration
Step 2: Use CLI Tools
For Supabase:
- Use
supabaseCLI for logs, configuration, database queries - Install if not available:
brew install supabase/tap/supabase - Authenticate:
supabase login
For 1Password:
- Use
opCLI for credential access - Already required for environment variable management
For Git/GitHub:
- Use
gitCLI for all git operations - Use
ghCLI for GitHub API operations
For Cloud Services:
- Use
awsCLI for AWS services - Use
gcloudCLI for Google Cloud - Use service-specific CLIs when available
Step 3: Provide Installation Instructions
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 · 234 lines · 30 tokens per session scan A b0c55c23c057
prefer_cli_tools is a cursor rule published in the GitHub repository markmhendrickson/foundation (2 stars, last pushed 1mo ago), licensed MIT. It adds 30 tokens to every session and 1,478 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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