task-logbook

task-logbook is a skill for Claude Code, Codex from marin-community/marin. It costs 38 tokens per session (1,326 once invoked), scanned A, original, Apache-2.0.

A procedure for keeping an append-only task logbook for durable notes, reproducible experiments, or work coordinated through an issue.

In plain words
What is it for?
It helps document experiments and ongoing tasks in Markdown, link them to issues or pull requests, and record relevant work-in-progress commits.
Why use it?
It preserves a detailed history of goals, code references, commands, settings, results, and interpretations across sessions.

Skill for Claude CodeCodex

About the project

Marin is an open-source research program, software platform, and community for developing foundation models such as large language models. Researchers use it for data preparation, tokenization, pretraining, posttraining, evaluation, and related experiments, including work on audio-text, DNA, and protein models. The catalogue entries are add-ons that support workflows around Marin.

marin-community/marin · 3,403 stars · on GitHub

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/marin-community/marin/task-logbook
Any agent
npx skills add marin-community/marin --skill task-logbook
Clone the repo
git clone --depth 1 https://github.com/marin-community/marin

Made for: Claude Code, Codex.

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 task-logbook

README.md
[![agentmods](https://agentmods.dev/badge/skills/marin-community/marin/task-logbook.svg)](https://agentmods.dev/skills/marin-community/marin/task-logbook)
Your own site
<a href="https://agentmods.dev/skills/marin-community/marin/task-logbook"><img src="https://agentmods.dev/badge/skills/marin-community/marin/task-logbook.svg" alt="Measured on agentmods" height="20"></a>
Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,326 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 $0.00038 $0.01326
Opus 5 $0.00019 $0.00663
Sonnet 5 $0.00008 $0.00265
Haiku 4.5 $0.00004 $0.00133

Measured 5d ago against content hash fd7b5624e8c3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

task-logbook 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 5d 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.

.agents/skills/task-logbook/SKILL.md · 181 lines

How it starts

The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Task logbook

Concepts

Keep the detailed append-only record in the logbook. If a coordinating issue exists, publish significant updates as comments and maintain its body as the current summary.

Location and Naming

  • Store logbooks under .agents/logbooks/<topic>.md.
  • Use a short, stable topic slug. Including the GitHub issue number is often a good choice.
  • Link to the coordinating GitHub issue or PR near the top of the logbook when one exists.

Logbook

New logbooks are Markdown files with YAML frontmatter.

Logbook Template

---
topic:
issue:
description:
author:
---

# <Topic>: Task Logbook

## Scope
- Goal:
- Primary metric(s):
- Constraints:
- Coordinating issue/PR:

## Baseline
- Date:
- Code refs:
- Baseline numbers:

## Entry Log
### YYYY-MM-DD HH:MM - <short label>
- Hypothesis:
- Commit Hash:
- Command:
- Config:
- Result:
- Interpretation:
- Next action:

When code changes affect reproducibility, make a lightweight WIP commit and record its hash. Stage only the files needed for the result. Apply the full commit workflow when promoting the work to a production PR.

For a research series, use one short experiment ID consistently in logbook entries, W&B runs, and issue comments.

Use the requesting user as author. Omit issue when none exists.

Write Rules

  • Append entries; do not rewrite history except to fix formatting or broken links or to add a coordinating issue reference.
  • Each non-trivial result needs exact commands, hash, config, key output, and the decision it caused.
  • Record failures and negative results with enough detail to avoid rediscovery.
  • Prefer terse tables for comparable numeric results.
  • Link large artifacts, W&B runs, dashboards, pinned GitHub paths, etc., instead of pasting dense output.
  • Keep claims scoped and falsifiable.
  • Label major claims when useful:
    • exploratory: single run or weak evidence.
    • replicated: repeated and consistent.
    • stable: held across relevant shape, seed, hardware, or workflow variants.

Read the full file on GitHub · 181 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. 5d ago First seen · 181 lines · 38 tokens per session scan A fd7b5624e8c3

Subscribe to this mod's changes

task-logbook is a skill published in the GitHub repository marin-community/marin (3,403 stars, last pushed today), licensed Apache-2.0. It adds 38 tokens to every session and 1,326 once invoked, about $0.0002 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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