Borrowing it
Nothing to install: this file belongs to os-tack/ostk-cache. 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/os-tack/ostk-cache/main/AGENTS.mdgit clone --depth 1 https://github.com/os-tack/ostk-cacheWrote 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/instructions/os-tack/ostk-cache/agents-md)<a href="https://agentmods.dev/instructions/os-tack/ostk-cache/agents-md"><img src="https://agentmods.dev/badge/instructions/os-tack/ostk-cache/agents-md/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/instructions/os-tack/ostk-cache/agents-md"><img src="https://agentmods.dev/badge/instructions/os-tack/ostk-cache/agents-md.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 | $0.03682 | $0.03682 |
| Opus 5.5 | $0.01473 | $0.01473 |
| Sonnet 5.5 | $0.00736 | $0.00736 |
| Haiku 4.5 | $0.00368 | $0.00368 |
Grade D, and why
ostk-cache AGENTS.md scanned grade D with 2 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 1mo 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
reap, and stderr separation. Dangerous commands (`rm -rf`, `chmod 777`, Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
reap, and stderr separation. Dangerous commands (`rm -rf`, `chmod 777`, How it starts
The opening of the file, as written. The whole thing — 241 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Kernel
When .ostk/ exists in the project run ostk boot first to load the kernel.
Run ostk shutdown (canonical, no kernel prefix) to cleanly terminate.
If ostk help or [ctx] envelopes show fewer resident tools than this doc
lists (e.g. bash, fs_ops, read, lock, spawn, interact, tack, help, session
missing), the project's .language is stale (pre-→1489 schema, blank column
10). Run ostk mcp diag to confirm, then ostk shutdown triggers the
→1597 backfill, OR delete .ostk/.language and re-boot to seed fresh. The
fix is in shutdown's compile_language; it is idempotent and silent.
Self-documenting surface (read this when something is missing)
The kernel emits its own canonical reference; trust it over older docs:
ostk --agents— agent-facing one-stop guide (syscalls, signals, vocab, do_not)ostk --help— full CLI tree, organized by section: SYSTEM ABI / DAILY WORK / WORK PIPELINE / IDENTITY & SECURITY / RECOVERY & FLEET / DOCUMENTATION & SPECS / INFRASTRUCTURE / DIAGNOSTICS / SYSTEM SETUPostk <verb> --help— per-verb help (every verb above)ostk mcp diag— verify tool surface integrity (seed × present × core × abi)
The structural split: System ABI verbs (frozen, agent-callable, exposed
as MCP tools) live under the SYSTEM ABI section. Operator-overlay verbs
(show, work, decide, trace, commit, recall) live under DAILY
WORK / WORK PIPELINE — they are CLI-only by design (per →1589 epic). The
mcp__ostk__* namespace mirrors the System ABI exactly. If you need a
verb that isn't in the MCP namespace, reach for ostk <verb> via bash.
In-flight ABI alignment work: EPIC →1821 (align ABI verb contracts across CLI, MCP, docs, and dispatch) tracks remaining drift between these
surfaces. If you hit a kernel verb X has no internal handler or a
schema mismatch, check the children of →1821 before fixing locally —
several are already filed (→1638 fs_ops dispatch gap, →1820 arrive
schema, →1822/→1826 recall surface, →1824 verb_load).
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.
- 1mo ago First seen · 241 lines · 3,682 tokens per session scan D a2a40c6edd2c
ostk-cache AGENTS.md is an instructions file published in the GitHub repository os-tack/ostk-cache (10 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 3,682 tokens to every session, about $0.0147 per session on Opus 5.5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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