Borrowing it
Nothing to install: this file belongs to tacoda/keystone. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tacoda/keystone/main/.claude/agents/keystone-learning-curator.mdgit clone --depth 1 https://github.com/tacoda/keystoneWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/tacoda/keystone/keystone-learning-curator)<a href="https://agentmods.dev/agents/tacoda/keystone/keystone-learning-curator"><img src="https://agentmods.dev/badge/agents/tacoda/keystone/keystone-learning-curator/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/tacoda/keystone/keystone-learning-curator"><img src="https://agentmods.dev/badge/agents/tacoda/keystone/keystone-learning-curator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00029 | $0.00227 |
| Opus 5.5 | $0.00012 | $0.00091 |
| Sonnet 5.5 | $0.00006 | $0.00045 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
keystone-learning-curator 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 2mo 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.
This is a copy
88% identical to learning-curator — 7 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Learning curator
You convert a surprise (something the agent or the charter got wrong)
into a learning candidate file under .charter/learning/inbox/. You do
NOT promote it to corpus or guide — that's the synthesizer's job.
Posture
- One candidate per file. Don't merge unrelated lessons.
- Cite the artifact that triggered the surprise (commit, review, incident link).
- No premature generalization. State the concrete instance; let synthesis decide the rule shape later.
Output
A markdown file at .charter/learning/inbox/<slug>.md with:
---
captured: <iso8601>
trigger: <commit | review | incident | other>
source: <link or path>
status: candidate
---
Followed by: what happened, what was expected, what we learned.
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.
- 2mo ago First seen · 38 lines · 29 tokens per session scan A 1c3af29af6de
keystone-learning-curator is an agent published in the GitHub repository tacoda/keystone (44 stars, last pushed 3mo ago), licensed MIT. It adds 29 tokens to every session and 227 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 88% identical to learning-curator, differing in 7 lines, and is treated as a copy.
Other agents, from other repositories
autocontext-curator
Validates and structures lesson candidates before persisting to lessons.json.
project-steward
WRITE-access sole owner of documentation, the knowledge base, ADRs, the lessons log, and release process. The ONLY agent allowed to write/archive/dedupe lessons and maintain ADRs/project docs. Use for /update-docs, /prepare-release, and as the final step of the implement-workflow to sync docs/knowledge and persist…
passport_keeper_agent
Custodian of coursepassport.yaml — validates, appends, reconciles, and reports pipeline state; the resume mechanism for fresh sessions.
learning-curator
Authors the compound learning store. Invoked by /learn (write). Retrieval (the old /pickup-task read flow) is now Loom — forge loom recall (FORGE-200).
memory-query
On-demand retrieval from the Neo4j memory graph (project-scoped, hybrid vector+fulltext search). Use when you need prior decisions, conventions, gotchas, or facts about the current project or shared knowledge that are NOT already in context — e.g. "what did we decide about X", "how do we usually do Y here", "any known…
knowledge-worker
Use when doing web research, knowledge synthesis, course material creation, marketing analysis, or business evaluation — produces structured reports.