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 commands/atuljha23/holocron/costgit clone --depth 1 https://github.com/atuljha23/holocronWrote 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/commands/atuljha23/holocron/cost)<a href="https://agentmods.dev/commands/atuljha23/holocron/cost"><img src="https://agentmods.dev/badge/commands/atuljha23/holocron/cost.svg" alt="Measured on agentmods" 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 | $0.00037 | $0.00396 |
| Opus 5 | $0.00018 | $0.00198 |
| Sonnet 5 | $0.00007 | $0.00079 |
| Haiku 4.5 | $0.00004 | $0.00040 |
Grade A, and why
cost scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
/holocron:cost
Show how many tokens you've spent and what it cost.
node "${CLAUDE_PLUGIN_ROOT}/scripts/holocron-cli.js" cost $ARGUMENTS
What you'll see
- Total cost in $ — summed across all logged sessions in the window
- Turns, input/output tokens, cache read/write
- Cache hit rate — the big one. Above ~70% is healthy. Below 50% means something is busting Anthropic's 5-min prompt cache; usually a volatile value (timestamp, random id) in CLAUDE.md or injected context.
- Per-model breakdown — where the money goes (
--breakdownor automatic if multiple models were used) - Top-10 sessions by cost (with
--by-session) - Budget status if configured (set via
/holocron:budget)
Defaults
--since 30d— last 30 days. Use7d,all, or a custom window like3d.- Data directory:
~/.holocron/sessions/. If empty, the Stop hook hasn't fired yet — run a Claude Code session, end it, and try again.
Pricing
Rates are hardcoded for Opus/Sonnet/Haiku 4.x (input, output, cache-write at 125% of input, cache-read at 10% of input). Update scripts/holocron-usage.js when Anthropic changes pricing.
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.
- 5d ago First seen · 32 lines · 0 tokens per session scan A cf74d262fc1e
cost is a command published in the GitHub repository atuljha23/holocron (2 stars, last pushed 4mo ago), licensed MIT. It adds 37 tokens to every session and 396 once invoked, about $0.0002 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.
Other commands, from other repositories
learn
Learn Claude Code best practices and capture lessons into persistent memory.
insights
Surface patterns from your pro-workflow learnings and session history.
wiki
Build, query, and maintain long-lived knowledge bases. Each wiki = markdown folder + SQLite FTS5 shadow index. Survives sessions, indexes auto-load on SessionStart.
handoff
Generate a structured handoff document that another Claude session (or your future self) can consume immediately to continue where you left off.
commit
Create a well-crafted commit after running pro-workflow quality checks.
context-optimizer
Diagnose and fix context window problems.