Borrowing it
Nothing to install: this file belongs to hidetaka-cci/advanced-circleci-mcp-server. 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/hidetaka-cci/advanced-circleci-mcp-server/main/.claude/skills/chunk-sidecar/SKILL.mdgit clone --depth 1 https://github.com/hidetaka-cci/advanced-circleci-mcp-serverWrote 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/hidetaka-cci/advanced-circleci-mcp-server/chunk-sidecar)<a href="https://agentmods.dev/skills/hidetaka-cci/advanced-circleci-mcp-server/chunk-sidecar"><img src="https://agentmods.dev/badge/skills/hidetaka-cci/advanced-circleci-mcp-server/chunk-sidecar/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/hidetaka-cci/advanced-circleci-mcp-server/chunk-sidecar"><img src="https://agentmods.dev/badge/skills/hidetaka-cci/advanced-circleci-mcp-server/chunk-sidecar.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 | $0.00150 | $0.03962 |
| Opus 5 | $0.00075 | $0.01981 |
| Sonnet 5 | $0.00030 | $0.00792 |
| Haiku 4.5 | $0.00015 | $0.00396 |
Grade C, and why
chunk-sidecar scanned grade C with 1 finding 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 10d 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.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
- **Auth errors (401/403, "token invalid", "unauthorized")** — run `chunk auth status` and follow its printed remediation (`chunk auth set circleci` / `github` / `anthropic`). Never dump env vars. How it starts
The opening of the file, as written. The whole thing — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chunk Sidecar Skill
Run the user's build, test, and validate commands on a remote chunk sidecar instead of locally. The 90% job is the sync → validate loop. This skill also covers one-time setup (create, snapshot, environment customization).
Sidecars are ephemeral Linux environments provisioned via CircleCI. They isolate work, avoid local port conflicts, and can be reset to known-good snapshots. Your local tree is mirrored to ~/workspace/<repo> on the sidecar each time you sync — the absolute path depends on the SSH user's home (e.g. /home/circleci/workspace/<repo> on cimg/* images, /home/user/workspace/<repo> on the default Ubuntu template). To see the resolved workspace, run chunk sidecar current --json and read the workspace field.
CIRCLE_TOKEN is forwarded over SSH automatically, so authenticated CircleCI API calls work out of the box once a token is configured locally.
The bare default sidecar image does not include the circleci CLI or the circleci-testsuite Smarter Testing plugin. If your validate commands need either, install them during one-time setup (Step 3) and snapshot the result so future sidecars boot with them ready. A snapshot built from a cimg/* base does not include circleci-testsuite either.
Step 1: Prerequisites
Run these checks in order. Stop and report to the user if anything fails.
chunk --version— confirms the CLI is installed and on PATH.chunk auth status— validates the configured credentials. Rely on the exit code: non-zero means a configured credential failed validation. Zero does not mean every credential is set — a missing CircleCI or GitHub token prints "Not set" and still exits zero. Read the output: if CircleCI shows "Not set", stop and ask the user to runchunk auth set circlecibefore proceeding (the sidecar commands in Step 2 will otherwise fail with an auth error). The command's output masks tokens; do not dig into env vars yourself.
Do not run echo $CIRCLE_TOKEN, env, printenv, or any other command that reads credential environment variables. That leaks secrets into conversation context. If chunk auth status reports a failure or shows a required credential as "Not set", surface its printed remediation (e.g. "Run chunk auth set circleci") and stop.
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.
- 10d ago First seen · 200 lines · 150 tokens per session scan C 84d5e7c89789
chunk-sidecar is a skill published in the GitHub repository hidetaka-cci/advanced-circleci-mcp-server (0 stars, last pushed 1mo ago), licensed MIT. It adds 150 tokens to every session and 3,962 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it C with 1 finding (harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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