devlog

A skill for turning a coding session into a dated development journal stored as HTML. It creates a new numbered log for each call and updates an index without replacing earlier logs.

In plain words
What is it for?
Use it to create session summaries with sections such as Summary, Changes, Decisions, and Next, then browse them through the generated HTML index.
Why use it?
It preserves what happened, what changed, which decisions were made, and what comes next in a self-contained record. This avoids relying on memory or scattered notes.

Skill for Claude CodeCodex

Part of the chronicle plugin — 6 skills, 6 commands 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/sp-daewoon/chronicle/devlog
Any agent
npx skills add sp-daewoon/chronicle --skill devlog
Clone the repo
git clone --depth 1 https://github.com/sp-daewoon/chronicle

Made for: Claude Code, Codex.

Or install chronicle, the plugin that ships this one along with the rest of its 6 skills, 6 commands.

Per session 67 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 352 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 $0.00067 $0.00352
Opus 5 $0.00034 $0.00176
Sonnet 5 $0.00013 $0.00070
Haiku 4.5 $0.00007 $0.00035

Measured 3d ago against content hash dbd54aaa58e1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

devlog 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/devlog/SKILL.md · 42 lines

What it actually says

Devlog Workflow

Capture a development session as a dated HTML log.

Gather the session

Summarize what happened this session into the configured sections (default: Summary, Changes, Decisions, Next). Each section's content must be a fragment of valid HTML (e.g. <p>...</p>, <ul><li>...</li></ul>).

Build a JSON object:

{
  "title": "Short session title",
  "sections": [
    { "heading": "Summary", "html": "<p>...</p>" },
    { "heading": "Changes", "html": "<ul><li>...</li></ul>" }
  ]
}

Render

Pipe the JSON into the helper with today's date:

echo "$JSON" | node "${CLAUDE_PLUGIN_ROOT}/scripts/devlog-render.mjs" --date <today>

The helper writes <devlog.dir>/YYYY-MM-DD.html (sequencing -2, -3 on repeat calls the same day — it never overwrites) and rebuilds index.html.

Rules

  • Use today's real date (never guess).
  • Repeat calls the same day create new sequenced files; do not overwrite prior logs.
  • Keep HTML fragments self-contained — no external scripts or stylesheets.
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 · 42 lines · 67 tokens per session scan A dbd54aaa58e1

Subscribe to this mod's changes

devlog is a skill published in the GitHub repository sp-daewoon/chronicle (4 stars, last pushed 3mo ago), licensed MIT. It adds 67 tokens to every session and 352 once invoked, about $0.0003 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 2026-08-31.

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