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/agenticnotetaking/arscontexta/rethinknpx skills add agenticnotetaking/arscontexta --skill rethinkgit clone --depth 1 https://github.com/agenticnotetaking/arscontextaWhat 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 | $0.00051 | $0.06267 |
| Opus 5 | $0.00026 | $0.03134 |
| Sonnet 5 | $0.00010 | $0.01253 |
| Haiku 4.5 | $0.00005 | $0.00627 |
Grade A, and why
rethink 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.
How it starts
The opening of the file, as written. The whole thing — 658 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Runtime Configuration (Step 0 — before any processing)
Read these files to configure domain-specific behavior:
-
ops/derivation-manifest.md— vocabulary mapping, domain context- Use
vocabulary.notesfor the notes folder name - Use
vocabulary.notefor the note type name in output - Use
vocabulary.rethinkfor the command name in output - Use
vocabulary.topic_mapfor MOC references - Use
vocabulary.cmd_reflectfor connection-finding references
- Use
-
ops/config.yaml— thresholds, processing preferencesself_evolution.observation_threshold: number of pending observations before suggesting rethink (default: 10)self_evolution.tension_threshold: number of pending tensions before suggesting rethink (default: 5)
-
ops/methodology/— existing methodology notes (read all to understand current system self-knowledge)
If these files don't exist (pre-init invocation or standalone use), use universal defaults.
The command name itself transforms per domain. The derivation manifest maps the universal name to domain-native language. If no manifest exists, use "rethink" as the command name.
EXECUTE NOW
Target: $ARGUMENTS
Parse immediately:
- If target is empty: run full six-phase rethink (Phase 0 drift check + five evidence phases) on all pending observations and tensions
- If target is "triage": run Phase 1 only (triage and methodology updates, no pattern detection)
- If target is "patterns": skip triage, run Phases 3-5 only (analyze existing evidence for patterns)
- If target is "drift": run Phase 0 only (drift check without triage or pattern detection)
- If target is a specific observation or tension filename: triage that single item interactively
START NOW. Reference below defines the six-phase workflow.
Philosophy
The system is not sacred. Evidence beats intuition.
Every rule in the context file, every workflow in a skill, every assumption baked into the architecture was a hypothesis at some point. Hypotheses need testing against reality. Observation notes in ops/observations/ capture friction from actual use. Tension notes in ops/tensions/ capture unresolved conflicts. Rethink first triages these individually (some become {DOMAIN:notes}, some become methodology updates, some get archived), then compares remaining evidence against what the system assumes and proposes changes when patterns emerge.
What ships with it
1 file 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.
- 3d ago First seen · 658 lines · 51 tokens per session scan A 99d1c30741dc
rethink is a skill published in the GitHub repository agenticnotetaking/arscontexta (3,486 stars, last pushed 6mo ago), licensed MIT. It adds 51 tokens to every session and 6,267 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 2026-08-30.
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