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/m4ttstack/fast-browser/mine-macrosnpx skills add m4ttstack/fast-browser --skill mine-macrosgit clone --depth 1 https://github.com/m4ttstack/fast-browserWhat 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 | $0.00021 | $0.00889 |
| Opus 5 | $0.00010 | $0.00445 |
| Sonnet 5 | $0.00004 | $0.00178 |
| Haiku 4.5 | $0.00002 | $0.00089 |
Grade A, and why
mine-macros 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.
How it starts
The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mine Macros
Turn repeated recorded flows into proposals. Never install a mined macro without explicit approval for that individual macro in the current conversation.
Fast path vs batch path
This skill is the batch path: it mines old recorded sessions for repeated
macro candidates and requires evidence from at least two sessions. The
immediate single-session path is flow distillation, owned by
fast-browsing: right after an ad hoc solve, the just-performed session
compiles into a flow via fast-browser flows compile, gated for anything
mutating by the human running fast-browser flows approve. Neither path
replaces the other. A single session is never macro evidence here, the
2+ session rule never migrates onto the flows path, and the flows fast
path never installs a macro.
Recording gate
Read ~/.fast-browser/config.json first. If sessions.enabled is false,
return:
Session recording is disabled; there are no sessions to mine.
Stop. Do not enumerate sessions, inspect other roots, or mutate macro state.
Mine sessions
- Repair first. Read
~/.fast-browser/macro-failures.mdwhen present. Match each failed macro to recent sessions on the same origin and queue a repaired script as a proposal before new candidates. - Collect direct sessions. Enumerate only direct
session-*directories beneath~/.fast-browser/sessions/. Do not mine nested directories or~/.fast-browser/archive/. Parse eachsession.mdinto its ordered tool flow and report unparseable sessions as no-ops. - Cluster repeated flows. Group by origin and similar ordered actions. Require evidence from at least two sessions. Treat repeated handwritten scripts for the same origin as strong candidates.
- Exclude known decisions. Drop flows covered by
~/.fast-browser/macros/MACROS.mdor~/.fast-browser/rejected-macros.md. A single filename-only macro run is evidence for an existing macro, not a new candidate. - Draft safely. Parameterize values that vary; retain stable values.
Follow the browser-macros authoring contract. Keep the complete script in
memory or a temporary file outside
~/.fast-browser/macros/. - Propose one at a time. Present the name, description, parameters, complete script, supporting session directories, and occurrence count. Request one decision for that macro: Approve, Reject, or Edit first. Wait for the answer before writing any disposition.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 91 lines · 21 tokens per session scan A ad40dcd3a23a
mine-macros is a skill published in the GitHub repository m4ttstack/fast-browser (0 stars, last pushed 7d ago), licensed MIT. It adds 21 tokens to every session and 889 once invoked, about $0.0001 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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