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/kunchenguid/firstmate/updatefirstmatenpx skills add kunchenguid/firstmate --skill updatefirstmategit clone --depth 1 https://github.com/kunchenguid/firstmateWhat 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 | $0.00110 | $0.01153 |
| Opus 5 | $0.00055 | $0.00576 |
| Sonnet 5 | $0.00022 | $0.00231 |
| Haiku 4.5 | $0.00011 | $0.00115 |
Grade A, and why
updatefirstmate 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
updatefirstmate
Self-update firstmate in place.
Firstmate is its own repo, behind the same no-mistakes gate as any project, so new tracked material (AGENTS.md, bin/, .agents/skills/, and public skills/) reaches main and then sits there until each running firstmate pulls it.
Only AGENTS.md, bin/, and .agents/skills/ are a running firstmate instruction surface; public skills/ is installer-facing and is not loaded by firstmate.
This skill performs that pull for the running main firstmate and every secondmate, without disturbing any in-flight work.
The update is fast-forward only - the same sanctioned self-write as the fleet sync firstmate already runs.
For a remote route, it updates the configured Firstmate code root on that host from its own origin, then guardedly fast-forwards the persistent home to that code-root commit.
It never forces, never creates a merge commit, never stashes, and advances a target only on a clean fast-forward; anything dirty, diverged, offline, or on the wrong branch is skipped and reported.
A tracked-files fast-forward leaves the gitignored operational dirs (data/, state/, config/, projects/, .no-mistakes/) untouched, so a secondmate's in-flight work is never disrupted.
This touches only the firstmate repo and its own worktrees, never anything under projects/.
What it does
-
Run the updater:
bin/fm-update.shIt fast-forwards this firstmate repo's default branch from origin, then updates every registered local or remote secondmate home through its placement-specific guarded path. It prints one status line per target (
updated <old>..<new>/already current/skipped: <reason>), followed by two action lines that tell you exactly what to do next:reread-firstmate: yes|nonudge-secondmates: fm-<id>...|none
-
Re-read AGENTS.md if your own instructions changed. When the updater printed
reread-firstmate: yes, the tracked instruction surface (AGENTS.md,bin/, or.agents/skills/) just advanced under you. ReadAGENTS.mdnow (CLAUDE.md is a real@AGENTS.mdpointer to it) to refresh your operating instructions before doing anything else, so you are acting on the new instructions rather than the stale ones you were started with. When it printedreread-firstmate: no, nothing changed for you - skip the re-read.
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.
- 2d ago First seen · 65 lines · 110 tokens per session scan A f0ef8bda095e
updatefirstmate is a skill published in the GitHub repository kunchenguid/firstmate (4,623 stars, last pushed today), licensed MIT. It adds 110 tokens to every session and 1,153 once invoked, about $0.0006 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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