# Rerun Mcap (agent skill)

> Rerun Mcap is an agent skill (a SKILL.md file) from rerun-io/rerun. Ingest MCAP files into Rerun chunk streams with rerun.chunk.McapReader. It works with Claude Code and has 11,642 GitHub stars across a repository of 5 listed skills. Install it by copying the skill folder into your agent's skills directory.

Ingest MCAP files into Rerun chunk streams with rerun.chunk.McapReader. Read when converting an MCAP recording, selecting topics or decoders, decoding custom protobuf messages, or when an MCAP-derived stream comes out empty. Builds on rerun-chunk-processing (stream mechanics) and rerun-data-model (what the topics should become). McapReader turns an MCAP file into a lazy chunk stream: one entity per topic at the topic's path, message payloads decoded by pluggable decoders.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/rerun-io/rerun |
| Skill path | skills/rerun-mcap/SKILL.md |
| Skill name | rerun-mcap |
| GitHub stars | 11,642 |
| Installs on skills.sh | not listed |
| License | Apache-2.0 |
| Skills in repo | 5 |
| Plugin marketplace | no |
| Official | no |
| Works with | Claude Code |
| Category | Data & analysis |
| Last commit | Oct 26, 2026 |

## Add this skill

### Claude Code

```sh
git clone --depth 1 https://github.com/rerun-io/rerun.git
cp -r rerun/skills/rerun-mcap ~/.claude/skills/rerun-mcap   # personal, or .claude/skills in a project
```

In the Claude apps, zip the skill folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

### ChatGPT / Codex

```sh
git clone --depth 1 https://github.com/rerun-io/rerun.git
cp -r rerun/skills/rerun-mcap .agents/skills/rerun-mcap   # repo; ~/.agents/skills for all projects
```

### Cursor

```sh
git clone --depth 1 https://github.com/rerun-io/rerun.git
cp -r rerun/skills/rerun-mcap .cursor/skills/rerun-mcap   # project; ~/.cursor/skills for all projects
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

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Canonical page: https://appsgit.com/skills/rerun-io-rerun-mcap
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