Borrowing it
Nothing to install: this file belongs to hansipie/ecotokens. 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/hansipie/ecotokens/master/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/hansipie/ecotokensWrote 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/hansipie/ecotokens/copilot-instructions)<a href="https://agentmods.dev/instructions/hansipie/ecotokens/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/hansipie/ecotokens/copilot-instructions.svg" alt="Measured on agentmods" 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 | $0.01195 | $0.01195 |
| Opus 5 | $0.00598 | $0.00598 |
| Sonnet 5 | $0.00239 | $0.00239 |
| Haiku 4.5 | $0.00120 | $0.00120 |
Grade B, and why
ecotokens copilot-instructions.md scanned grade B 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 7d 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
ecotokens install --target gemini # Gemini CLI (writes BeforeTool hook + mcpServers in ~/.gemini/settings.json) How it starts
The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ecotokens — Copilot Instructions
What this project does
ecotokens is a token-saving companion for Claude Code and Gemini CLI. It intercepts bash/shell command outputs before they reach the model, compresses them with family-specific filters, and records how many tokens were saved.
Commands
# Build
cargo build
# Test full suite
cargo test
# Test a single integration or unit test file (no .rs suffix)
cargo test --test filter_git_test
cargo test --test gain_tui_test
# Lint (warnings are errors)
cargo clippy -- -D warnings
# Format check (required before push)
cargo fmt --check
cargo fmt
# Pre-push one-liner
cargo fmt --check && cargo clippy -- -D warnings && cargo test
# Install ecotokens hook
ecotokens install --target claude # Claude Code only
ecotokens install --target gemini # Gemini CLI (writes BeforeTool hook + mcpServers in ~/.gemini/settings.json)
ecotokens install --target all # all targets
ecotokens uninstall --target gemini # remove Gemini registration
Architecture
The project is organized into 12 modules, each with a mod.rs exporting its public API:
| Module | Role |
|---|---|
filter/ |
Family-specific output compression (Git, Cargo, Python, C++, FS, Markdown, ConfigFile, Generic) |
hook/ |
Handles hook stdin→stdout for Claude Code (PreToolUse, ecotokens hook), Gemini CLI (BeforeTool, ecotokens hook-gemini), and Qwen Code (PreToolUse, ecotokens hook-qwen) |
metrics/ |
Appends Interception records to ~/.config/ecotokens/metrics.jsonl; aggregates for reports |
tokens/ |
count_tokens(s) — dispatches to tiktoken-rs cl100k_base (exact-tokens feature) or estimate_tokens heuristic (chars * 0.25) by default |
search/ |
Tantivy BM25 index + tree-sitter symbol extraction; chunk size 50 lines |
trace/ |
Call graph queries (callers/callees) over the search index |
tui/ |
Ratatui dashboards (gain, outline, trace, progress, watch) |
mcp/ |
JSON-RPC stdio server (rmcp crate) exposing 4 tools |
config/ |
TOML settings at ~/.config/ecotokens/settings.toml; all fields optional with defaults |
masking/ |
Regex-based PII/secret redaction (AWS keys, GitHub PATs, JWTs, .env secrets, etc.) |
install/ |
Idempotent hook + MCP registration for Claude Code (~/.claude/settings.json + ~/.claude.json) and Gemini CLI (~/.gemini/settings.json) |
daemon/ |
notify-based file watcher; debounces 500 ms before reindexing |
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.
- 7d ago First seen · 97 lines · 1,195 tokens per session scan B da1457c7ea5b
ecotokens copilot-instructions.md is an instructions file published in the GitHub repository hansipie/ecotokens (20 stars, last pushed 1mo ago), licensed MIT. It adds 1,195 tokens to every session, about $0.0060 per session on Opus 5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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