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 skills add jmagly/aiwg --skill cost-historygit clone --depth 1 https://github.com/jmagly/aiwgWrote 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/skills/jmagly/aiwg/cost-history)<a href="https://agentmods.dev/skills/jmagly/aiwg/cost-history"><img src="https://agentmods.dev/badge/skills/jmagly/aiwg/cost-history/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/skills/jmagly/aiwg/cost-history"><img src="https://agentmods.dev/badge/skills/jmagly/aiwg/cost-history.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00022 | $0.01502 |
| Opus 5 | $0.00011 | $0.00751 |
| Sonnet 5 | $0.00004 | $0.00300 |
| Haiku 4.5 | $0.00002 | $0.00150 |
Grade A, and why
cost-history 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 4d 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 — 187 lines — stays where its author put it; the contents beside it link to each section on GitHub.
cost-history
You show cost trends across multiple workflow sessions. You read historical cost records from .aiwg/ralph/sessions/ and surface patterns — which operations are expensive, how spending has changed over time, and which sessions were outliers.
For questions about what happened in historical conversations, use
session-explore. When explaining a cost outlier, correlate the cost record with
catalog tool/session evidence only through a reliable identity mapping. Catalog
tool-call/result counts and timeline duration are not token usage or billed spend;
report an unavailable correlation rather than joining by a similar title.
Triggers
Alternate expressions and non-obvious activations (primary phrases are matched automatically from the skill description):
- "what have I spent overall" → full history summary
- "are costs going up or down" → trend analysis
- "most expensive sessions" → sorted history by cost
- "cost this week" / "cost this month" → time-windowed history
Trigger Patterns Reference
| Pattern | Example | Action |
|---|---|---|
| Full history | "show cost history" | aiwg cost-history |
| Recent sessions | "last 5 sessions" | aiwg cost-history --last 5 |
| Time window | "costs this week" | aiwg cost-history --since 7d |
| Trend summary | "are my costs trending up" | aiwg cost-history --trend |
| Sorted by cost | "most expensive sessions" | aiwg cost-history --sort cost |
Behavior
When triggered:
-
Determine scope:
- Default: all recorded sessions, newest first
--last N: most recent N sessions--since <duration>: sessions within the time window (e.g.,7d,30d,2026-03-01)
-
Read session records:
.aiwg/ralph/sessions/*/metrics.json— per-session cost records.aiwg/ralph/cost-tracking.json— aggregated history index
-
Compute trend data:
- Session-over-session delta
- Rolling 7-session average
- Outlier detection (sessions > 2x average)
-
Run the command:
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.
- 4d ago Changed · +5 lines bd1cc6a6a32a
- 9d ago First seen · 182 lines · 22 tokens per session scan A 54a667c0067e
cost-history is a skill published in the GitHub repository jmagly/aiwg (211 stars, last pushed 2d ago), licensed MIT. It adds 22 tokens to every session and 1,502 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 2026-09-03.
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