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Agent skill

Tokf Discover

by mpecan in mpecan/tokf

Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.

MITAuto-check passed

Install Tokf Discover

skills CLI
$ npx skills add mpecan/tokf --skill tokf-discover -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mpecan/tokf tokf-discover --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mpecan/tokf.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/tokf-cli/skills/codex-discover .claude/skills/tokf-discover && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
tokf-discover
GitHub stars
199
Token cost
~305 tokens
SKILL.md length
151 words
Files
1
Skills in repo
4
Repo updated
First seen
Licence
MIT

At a glance

Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.

  • Works in 4 steps: Run tokf discover to identify top… → For commands with existing filters: run… → For commands without filters: create a… → …
  • SKILL.md covers Quick Start, Options, Workflow and JSON Output
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Tokf Discover is an agent skill from mpecan/tokf. Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.

Its SKILL.md is about 310 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Config-driven CLI tool that compresses command output before it reaches an LLM context. The licence is MIT.

Example prompts

  • “/tokf-discover”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Run tokf discover to identify top savings opportunities
  2. For commands with existing filters: run tokf hook install --tool codex to set up automatic filtering
  3. For commands without filters: create a custom filter with tokf eject
  4. Re-run tokf discover after changes to verify improvement

What it can do on your machine

Read from SKILL.md and the folder at commit 87c93d9. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Tokf Discover loads about 305 tokens when it runs. Until then it costs about 30 tokens; SKILL.md has 151 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~30
When it runs · the whole SKILL.md, loaded when a task matches
~305

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mpecan/tokf at commit 87c93d9, republished under its MIT licence (© mpecan). 151 words, ~305 tokens.

Download SKILL.mdSave it as .claude/skills/tokf-discover/SKILL.md (or your agent's skills folder).
name
tokf-discover
description
Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.

tokf discover — Find Missed Token Savings

Use this skill to analyze past sessions and find commands that are running without tokf filtering, wasting tokens on verbose output.

Quick Start

Run tokf discover in the project directory to scan recent sessions:

bash
tokf discover

Options

  • --all — scan all projects, not just the current one
  • --since 7d — only scan sessions from the last 7 days (also 24h, 30m)
  • --limit 0 — show all results (default: top 20)
  • --json — output as JSON for programmatic use
  • --session <path> — scan a specific session file
  • --project <path> — scan sessions for a specific project path

Workflow

  1. Run tokf discover to identify top savings opportunities
  2. For commands with existing filters: run tokf hook install --tool codex to set up automatic filtering
  3. For commands without filters: create a custom filter with tokf eject
  4. Re-run tokf discover after changes to verify improvement

JSON Output

Use --json for integration with other tools:

bash
tokf discover --json

© mpecan, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/tokf-cli/skills/codex-discover of mpecan/tokf.

Open the folder on GitHubat commit 87c93d9

Compare with similar skills

Tokf Discover next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Tokf Discover compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Tokf Discover this skillmpecan/tokf199—~305Automated safety check: PassMIT
Scanwshobson/agents40k—~2.2kAutomated safety check: PassMIT
Repo Scanaffaan-m/ECC276k—~1.5kAutomated safety check: PassMIT
Repo Scanaffaan-m/ECC276k—~1.3kAutomated safety check: PassMIT
Vulnerability Scanningsickn33/agentic-awesome-skills47k1 repos~2.8kAutomated safety check: PassMIT
Repo Scanaffaan-m/ECC277k1 repos~1.8kAutomated safety check: PassMIT

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More from mpecan/tokf

  • Tokf Filter

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  • Tokf Run

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Questions about Tokf Discover

What does Tokf Discover do?

Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering. Tokf Discover is an agent skill from mpecan/tokf. Find missed token savings by scanning AI coding session files for commands that ran without tokf filtering.

How do I install Tokf Discover in Claude Code?

Run `npx skills add mpecan/tokf --skill tokf-discover -a claude-code`. Or copy the skill folder (crates/tokf-cli/skills/codex-discover in mpecan/tokf) into .claude/skills/tokf-discover in your project. Claude Code loads it when a task matches its description.

How do I install Tokf Discover in Codex?

Run `npx skills add mpecan/tokf --skill tokf-discover -a codex`. Or copy the skill folder (crates/tokf-cli/skills/codex-discover in mpecan/tokf) into .agents/skills/tokf-discover in your project. Codex loads it when a task matches its description.

Can I use Tokf Discover in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mpecan/tokf --skill tokf-discover -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/tokf-discover, .gemini/skills/tokf-discover, .github/skills/tokf-discover and .opencode/skills/tokf-discover in your project.

What does Tokf Discover need to run?

SKILL.md names no scripts, command-line tools or credentials: Tokf Discover is instructions for the agent only.

Does Tokf Discover access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Tokf Discover safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Tokf Discover use?

Tokf Discover is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Tokf Discover use?

About 305 tokens (SKILL.md is roughly 1.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Tokf Discover?

Skills that share tags, products or a category with Tokf Discover: Scan (wshobson/agents, 40k stars), Repo Scan (affaan-m/ECC, 276k stars), Repo Scan (affaan-m/ECC, 276k stars) and Vulnerability Scanning (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Tokf Discover?

mpecan (a GitHub user) maintains it in mpecan/tokf, which has 199 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on October 10, 2026.

Source: mpecan/tokf on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.