Borrowing it
Nothing to install: this file belongs to cel-expr/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/cel-expr/skills/main/GEMINI.mdgit clone --depth 1 https://github.com/cel-expr/skillsWrote 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.
[](https://agentmods.dev/instructions/cel-expr/skills/gemini-md)<a href="https://agentmods.dev/instructions/cel-expr/skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/cel-expr/skills/gemini-md/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.
<a href="https://agentmods.dev/instructions/cel-expr/skills/gemini-md"><img src="https://agentmods.dev/badge/instructions/cel-expr/skills/gemini-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00730 | $0.00730 |
| Opus 5.5 | $0.00292 | $0.00292 |
| Sonnet 5.5 | $0.00146 | $0.00146 |
| Haiku 4.5 | $0.00073 | $0.00073 |
Grade A, and why
skills GEMINI.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsSL --create-dirs -o "$HOME/.local/lib/cel/verifier-cli-0.14.0.jar" https://repo1.maven.org/maven2/dev/cel/verifier-cli/0.14.0/verifier-cli-0.14.0.jar How it starts
The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Common Expression Language (CEL) Skills
This repository provides tools and skills to author, test, debug, and optimize CEL expressions.
Provided Tools
cel-expr CLI (Recommended)
The standalone cel-expr CLI requires no special agent configuration and runs directly via standard terminal commands:
cel-expr env -env <path|json>: Defines/validates variables, functions, and types.cel-expr prompt -env <path|json> -prompt <requirement>: Generates authoring prompt.cel-expr compile -env <path|json> -expr <expr>: Compiles and type-checks CEL expressions.cel-expr eval -env <path|json> -expr <expr> -tests <path|json>: Evaluates expressions against test cases.
In open source, build the CLI with go build -o cel-expr ./cmd/cel-expr or install via go install github.com/cel-expr/skills/cmd/cel-expr@latest (and alias cel-expr="$(go env GOPATH)/bin/cel-expr" if $(go env GOPATH)/bin is not on your PATH).
cel-verifier CLI
The cel-verifier CLI provides formal Z3 SMT verification for CEL expressions
and policies:
cel-verifier verify-equiv --expr1 <expr> --expr2 <expr>--var <name>:<type>: Proves logical equivalence between two CEL expressions across all inputs.cel-verifier check-sat --expr <expr> --var <name>:<type>: Checks satisfiability and generates witness inputs.cel-verifier check-valid --expr <expr> --var <name>:<type>: Proves validity (isAlwaysTrue) and generates counterexamples on violation.cel-verifier verify-policy --file <policy.yaml> --var <name>:<type>: Verifies invariants on a YAML policy file.
# Download the cel-java verifier-cli JAR from Maven Central (requires Java 8+)
curl -fsSL --create-dirs -o "$HOME/.local/lib/cel/verifier-cli-0.14.0.jar" https://repo1.maven.org/maven2/dev/cel/verifier-cli/0.14.0/verifier-cli-0.14.0.jar
alias cel-verifier="java -jar $HOME/.local/lib/cel/verifier-cli-0.14.0.jar"
cel-expr-mcp MCP Server
The cel-expr-mcp MCP server provides matching tools (cel_create_environment,
cel_generate_prompt, cel_compile, cel_evaluate) for MCP-compatible clients.
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 Changed · +22 lines · +303 tokens per session cf6ae0cc5fd8
- 21d ago Changed · +6 lines · +178 tokens per session 14034b11a948
- 1mo ago First seen · 30 lines · 249 tokens per session scan A c6c786062a44
skills GEMINI.md is an instructions file published in the GitHub repository cel-expr/skills (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 730 tokens to every session, about $0.0029 per session on Opus 5.5. 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.
Other instructions, from other repositories
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AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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