catchup

catchup is a skill for Claude Code, Codex from LilMGenius/paperthin. It costs 84 tokens per session (716 once invoked), scanned A, original, MIT.

A project re-entry guide for a person who has lost track of a codebase. It reads the current files and project history to explain what needs attention, what changed, and unfamiliar terms.

In plain words
What is it for?
Returning to an interrupted project, understanding recent changes, finding decisions that need your input, and rebuilding a useful mental model.
Why use it?
It replaces stale memory with a short briefing based on the project's live state before the next decision is made.

Skill for Claude CodeCodex

Part of the paperthin plugin — 28 skills shipped together

Install

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.

agentmods
npx agentmods add skills/lilmgenius/paperthin/catchup
Any agent
npx skills add LilMGenius/paperthin --skill catchup
Clone the repo
git clone --depth 1 https://github.com/LilMGenius/paperthin

Made for: Claude Code, Codex.

Or install paperthin, the plugin that ships this one along with the rest of its 28 skills.

Wrote 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.

agentmods badge for catchup

README.md
[![agentmods](https://agentmods.dev/badge/skills/lilmgenius/paperthin/catchup.svg)](https://agentmods.dev/skills/lilmgenius/paperthin/catchup)
Your own site
<a href="https://agentmods.dev/skills/lilmgenius/paperthin/catchup"><img src="https://agentmods.dev/badge/skills/lilmgenius/paperthin/catchup.svg" alt="Measured on agentmods" height="20"></a>
Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 716 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00084 $0.00716
Opus 5 $0.00042 $0.00358
Sonnet 5 $0.00017 $0.00143
Haiku 4.5 $0.00008 $0.00072

Measured 3d ago against content hash d5b265bfbb21, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

catchup 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 3d 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.

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.

skills/coil/catchup/SKILL.md · 53 lines

How it starts

The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Catch the human up at their eye level, from state, not from memory.

Goal

catchup is the re-entry point for a lost human. Long agent cycles coin words, rename files, run experiments, and make calls faster than the owner can follow. Before any next action makes sense, the owner's mental model must be reloaded. catchup reads the live project state and returns a briefing a person with zero retained context can act on. It runs before the next move gets decided: catchup restores the map, so that decision starts from truth instead of a stale memory of it.

Workflow

  1. Read live state only: recent file mtimes, git log/diffs, plan and state docs, re0-memo notes, task boards. Never brief from conversation memory alone — memory is what drifted.
  2. Anchor on the human's last touch (their last message, judgment, or commit). Everything after that point is the delta; everything before it is assumed known and stays out.
  3. Compose in decision order, not chronological order:
    • Needs you — decisions, judgments, or inputs only the human can give, each self-contained enough to act on without opening another file.
    • Changed while you were away — outcomes, not process. "The plan's scoring rule was replaced" beats "I ran three analysis passes."
    • New words — every term coined or repurposed since their last touch, one line each, with where it lives. Skip terms they already used themselves.
  4. Gloss on first use: any project-specific term appearing in the briefing gets an inline plain-language aside at its first occurrence, even if a glossary section follows.
  5. Keep the default short (a screen or less). End with drill-down offers per section, not with everything expanded.

Rules

  • State-grounded: every claim traces to a file, commit, or artifact the human can open. No "as we discussed."
  • Read-only on the project. catchup briefs; it does not fix, rename, or decide.
  • The ask comes first. A briefing that buries the one question needing the human is a log.
  • Outcome voice, not journey voice. Narrating the agent's process is self-report, not briefing.
  • Silence the settled: closed decisions and healthy metrics get one line or none.
  • Honest completeness: "done" means verified done; "moved" is not "reconciled"; say which.
  • Do not re-explain terms the human demonstrably knows (they used them first).

Read the full file on GitHub · 53 lines

Changes

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.

  1. 3d ago First seen · 53 lines · 84 tokens per session scan A d5b265bfbb21

Subscribe to this mod's changes

catchup is a skill published in the GitHub repository LilMGenius/paperthin (999 stars, last pushed 15d ago), licensed MIT. It adds 84 tokens to every session and 716 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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