Sidecar is a terminal-based workspace for running AI coding agents alongside file trees, task issues, Git diffs, and Jira or GitHub resources in split panes. Developers use it to monitor agent sessions, inspect files and changes, manage workspaces, and handle tasks without leaving one shell. The catalogue entries extend or guide coding-agent workflows used with Sidecar.
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 marcus/sidecar --skill create-promptgit clone --depth 1 https://github.com/marcus/sidecarWrote 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/marcus/sidecar/create-prompt)<a href="https://agentmods.dev/skills/marcus/sidecar/create-prompt"><img src="https://agentmods.dev/badge/skills/marcus/sidecar/create-prompt/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/marcus/sidecar/create-prompt"><img src="https://agentmods.dev/badge/skills/marcus/sidecar/create-prompt.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 99 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00055 | $0.01053 |
| Opus 5.5 | $0.00022 | $0.00421 |
| Sonnet 5.5 | $0.00011 | $0.00211 |
| Haiku 4.5 | $0.00006 | $0.00105 |
Grade A, and why
create-prompt 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 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.
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 — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating Prompts
Prompts are reusable templates that configure the initial context for agents when creating workspaces. They help standardize common workflows like code reviews, bug fixes, or feature implementation.
Config File Locations
| Scope | Path | Override Priority |
|---|---|---|
| Global | ~/.config/sidecar/config.json |
Lower |
| Project | .sidecar/config.json (in project) |
Higher |
Project prompts override global prompts with the same name (case-sensitive match).
Config Format
{
"prompts": [
{
"name": "Code Review",
"ticketMode": "optional",
"body": "Do a detailed code review of {{ticket || 'open reviews'}}.\nFocus on correctness, edge cases, and test coverage."
}
]
}
Prompt Fields
name (required)
Display name shown in the prompt picker. Keep it concise.
ticketMode (optional)
Controls how the ticket/task field behaves:
| Mode | Behavior |
|---|---|
optional |
Task field shown, can be empty (default) |
required |
Task must be selected before creating |
none |
Task field is hidden, prompt stands alone |
body (required)
The prompt text sent to the agent. Supports template variables. Use \n for newlines.
Template Variables
{{ticket}}
Expands to the selected task ID. Returns empty string if no task selected.
"body": "Fix issue {{ticket}}."
// With task td-abc123: "Fix issue td-abc123."
// Without task: "Fix issue ."
{{ticket || 'fallback'}}
Expands to task ID, or the fallback text if no task selected.
"body": "Review {{ticket || 'all open items'}}."
// With task td-abc123: "Review td-abc123."
// Without task: "Review all open items."
Only single quotes work for fallback text:
{{ticket || 'default'}}-- works{{ticket || "default"}}-- does NOT work
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 · 137 lines · 55 tokens per session scan A 241e4fc3b88e
create-prompt is a skill published in the GitHub repository marcus/sidecar (1,091 stars, last pushed 18d ago), licensed MIT. It adds 55 tokens to every session and 1,053 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-05.
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