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.
npx agentmods add skills/block/trailblaze/devlognpx skills add block/trailblaze --skill devloggit clone --depth 1 https://github.com/block/trailblazeWhat 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 | $0.00044 | $0.00540 |
| Opus 5 | $0.00022 | $0.00270 |
| Sonnet 5 | $0.00009 | $0.00108 |
| Haiku 4.5 | $0.00004 | $0.00054 |
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 yesterday.
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.
What it actually says
Devlog
Write or update a devlog entry in the devlog directory.
Devlog Format
Devlog entries are development journal posts that capture decisions, discoveries, and plans as work happens. They're written for the team — concise, honest, and useful for future reference.
Filename: YYYY-MM-DD-<topic-slug>.md
Use today's date and a short kebab-case topic slug.
Entry Structure
---
title: "Short Descriptive Title"
type: devlog
date: YYYY-MM-DD
---
# Title
## Summary
1-3 sentences on what this entry covers.
## <Sections as needed>
Use whatever sections make sense for the content. Common ones:
- What Changed
- Key Decisions (and rationale)
- What We Learned
- Open Questions
- Future Work
Keep it direct. No filler. Write like you're explaining to a teammate who will read this in 3 months.
Front Matter Fields
| Field | Required | Values |
|---|---|---|
title |
Yes | Short descriptive title |
type |
Yes | decision (architectural/technical choice) or devlog (development note) |
date |
Yes | YYYY-MM-DD format |
Use type: decision when recording a significant architectural or technical choice. Use type: devlog for development notes, debugging sessions, and implementation details.
Guidelines
- Be opinionated. Capture why decisions were made, not just what happened.
- Include the dead ends. What didn't work and why is often more valuable than what did.
- Link to context. Reference PRs, branches, test names, file paths — make it traceable.
- One entry per topic. Don't combine unrelated work. Multiple entries on the same day is fine.
Before Writing
- Check existing devlog entries to avoid duplicating a topic
- If updating an existing topic, consider appending to the existing entry rather than creating a new one
- Review the current conversation context for decisions, discoveries, and rationale worth capturing
Invocation
When the user says /devlog, ask what topic to write about if it's not clear from context. If you've been working on something substantial in the current session, suggest writing about that.
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.
- yesterday First seen · 68 lines · 44 tokens per session scan A d96fe3a49bbc
devlog is a skill published in the GitHub repository block/trailblaze (303 stars, last pushed 6d ago), licensed Apache-2.0. It adds 44 tokens to every session and 540 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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