Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add mbanderas/costguard/plugin install costguardWrote 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/mbanderas/costguard/costguard-audit)<a href="https://agentmods.dev/commands/mbanderas/costguard/costguard-audit"><img src="https://agentmods.dev/badge/commands/mbanderas/costguard/costguard-audit.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 | $0.00034 | $0.00499 |
| Opus 5 | $0.00017 | $0.00249 |
| Sonnet 5 | $0.00007 | $0.00100 |
| Haiku 4.5 | $0.00003 | $0.00050 |
Grade A, and why
costguard-audit 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 6d 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
Run a Costguard cost audit and report the findings.
Requested action: $ARGUMENTS
Costguard is a built CLI bundled with this plugin at
${CLAUDE_PLUGIN_ROOT}/dist/cli/index.js. It reads a workspaces.json
registry from the current working directory — run from a repo that has one
(e.g. the costguard checkout, or any project where you ran
costguard registry init).
-
Run the audit, passing the user's arguments straight through:
node "${CLAUDE_PLUGIN_ROOT}/dist/cli/index.js" audit $ARGUMENTS- No workspace named and no
--all: the CLI lists what is available — pass a workspace name (e.g.web-app) or--all. --providers all(or a comma list like--providers github,netlify) adds read-only cloud billing checks; provider modules whose token env var is absent are skipped, not failed.--ci-only/--crons-onlynarrow the static checks;--jsonemits JSON.
- No workspace named and no
-
Report the CLI's stdout verbatim — it is the cost report (estimated monthly waste per finding, with a fix suggestion). On a non-zero exit, relay the
Error: <message>line.
Notes:
- Prerequisite: the plugin runs the built
dist/. If${CLAUDE_PLUGIN_ROOT}/dist/cli/index.jsis missing, build it once from the costguard checkout withpnpm build(thenpnpm installif deps are absent). - All billing checks are read-only (GET / read-only GraphQL only). Costguard never writes to provider accounts and never prints tokens.
- Tokens are read from the environment /
.envonly. A workspace's providers are listed inworkspaces.json; a provider with no token present is skipped.
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.
- 6d ago First seen · 43 lines · 34 tokens per session scan A bd50d66e8d94
costguard-audit is a command published in the GitHub repository mbanderas/costguard (2 stars, last pushed 3d ago), licensed MIT. It adds 34 tokens to every session and 499 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.
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