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VFS

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MCP

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Task Prompt

I was thinking of watching a movie, and I remembered that in june 2025, my friend eldson recommended a movie on the movies channel. I don't remember the name, but I'd like to know the genre and the imdb score that I have recorded on my computer data.

Claims

The benchmark grades the final answer on these claims: an LLM judge scores each, and a run passes at 0.75 of them. Here each claim’s fact must appear in the answer.

The movie recommended by Éldson Santos in June 2025 is Fight Club.
The genre of Fight Club is drama.
According to the provided dataset, Fight Club has an IMDb score of 8.8.

VFS.md

---
name: workspace-filesystem
description: The virtual filesystem layout of this workspace.
---

# Virtual Filesystem

You work in a terminal over a virtual filesystem. Read files with shell
commands.

Command output comes back whole, however long. Some files here are large,
so point `grep -r`, `rg`, `find` and `cat` at the directory or file you
need rather than at a whole mount.

| path | what it is |
|---|---|
| `/data` | Your files. |
| `/slack` | Your Slack workspace, read-only. |
| `/tmp` | Scratch space, in memory. |

## `/slack`

```
/slack/
  channels/
    <channel-name>__<channel-id>/
      <yyyy-mm-dd>/
        chat.jsonl
        files/
          <name>__<file-id>
  dms/
    <user-name>__<dm-id>/
      <yyyy-mm-dd>/
        chat.jsonl
        files/
          <name>__<file-id>
  users/
    <username>__<user-id>.json
```

- `chat.jsonl`: one Slack message per line, `{type: str, user: str, text:
  str, ts: str, subtype?: str, files?: list[dict], reactions?: list[dict]}`
- `<user>.json`: `{id: str, name: str, real_name: str, deleted: bool,
  is_bot: bool, profile: {display_name: str, email: str, real_name: str}}`

name	workspace-filesystem
description	The virtual filesystem layout of this workspace.

Virtual Filesystem

You work in a terminal over a virtual filesystem. Read files with shell commands.

Command output comes back whole, however long. Some files here are large, so point grep -r, rg, find and cat at the directory or file you need rather than at a whole mount.

path	what it is
`/data`	Your files.
`/slack`	Your Slack workspace, read-only.
`/tmp`	Scratch space, in memory.

/slack

/slack/
  channels/
    <channel-name>__<channel-id>/
      <yyyy-mm-dd>/
        chat.jsonl
        files/
          <name>__<file-id>
  dms/
    <user-name>__<dm-id>/
      <yyyy-mm-dd>/
        chat.jsonl
        files/
          <name>__<file-id>
  users/
    <username>__<user-id>.json

chat.jsonl: one Slack message per line, {type: str, user: str, text: str, ts: str, subtype?: str, files?: list[dict], reactions?: list[dict]}
<user>.json: {id: str, name: str, real_name: str, deleted: bool, is_bot: bool, profile: {display_name: str, email: str, real_name: str}}

SKILL.md

---
name: workspace-commands
description: Use when running commands in this workspace - which commands exist, what they can do, and what the interpreter supports.
---

# Available commands

Python (`python` or `python3`), Perl, JavaScript/Node.js, and TypeScript
runtimes are unavailable. Use the shell commands and task CLIs documented
below; do not probe for or attempt to install other runtimes.

Standard Unix commands, among them:

    cat  head  tail  ls  find  grep  wc  sort  uniq  cut  tr  sed  awk
    diff  tee  xargs  jq

with pipes, `>` redirection and `$(...)` substitution.

Do not probe the machine with `which`, `type`, `--version`, `env`, `ps`,
`echo $PATH`, `ls /usr/bin` or `cat /usr/bin/<command>`: they tell you
nothing about the task.

A filename with a space in it needs quoting, as it would in any shell.

## slack

Use `slack <command> '<JSON arguments>'`. Run `slack <command> --help` to
get more information.

```sh
slack channels-list '{"channel_types":"public_channel,private_channel"}'
slack conversations-history '{"channel_id":"CHANNEL_ID","limit":"1d"}'
slack conversations-replies '{"channel_id":"CHANNEL_ID","thread_ts":"1234567890.123456"}'
slack conversations-search-messages '{"search_query":"QUERY","filter_in_channel":"CHANNEL_ID"}'
```

| Command | Arguments | Description |
|---|---|---|
| `slack channels-list` | `{channel_types: str, cursor?: str, limit?: number = 100, sort?: str}` | Get list of channels |
| `slack conversations-add-message` | `{channel_id: str, content_type?: str = "text/markdown", payload?: str, thread_ts?: str}` | Add a message to a public channel, private channel, or direct message (DM, or IM) conversation by channel_id and thread_ts. |
| `slack conversations-history` | `{channel_id: str, cursor?: str, include_activity_messages?: bool = false, limit?: str = "1d"}` | Get messages from the channel (or DM) by channel_id, the last row/column in the response is used as 'cursor' parameter for pagination if not empty |
| `slack conversations-replies` | `{channel_id: str, cursor?: str, include_activity_messages?: bool = false, limit?: str = "1d", thread_ts: str}` | Get a thread of messages posted to a conversation by channelID and thread_ts, the last row/column in the response is used as 'cursor' parameter for pagination if not empty |
| `slack conversations-search-messages` | `{cursor?: str = "", filter_date_after?: str, filter_date_before?: str, filter_date_during?: str, filter_date_on?: str, filter_in_channel?: str, filter_in_im_or_mpim?: str, filter_threads_only?: bool, filter_users_from?: str, filter_users_with?: str, limit?: number = 20, search_query?: str}` | Search messages in a public channel, private channel, or direct message (DM, or IM) conversation using filters. All filters are optional, if not provided then search_query is required. |

## weather

Use `weather <command> '<JSON arguments>'`. Run `weather <command> --help`
to get more information.

```sh
weather find-weather-stations '{"location":"40.7128,-74.0060"}'
```

| Command | Arguments | Description |
|---|---|---|
| `weather find-weather-stations` | `{location: str, limit?: number = 10}` | Find weather observation stations near a location in the United States. Useful for getting station-specific data, finding data sources, or understanding which stations provide weather data for an area. Includes ASOS, AWOS, and other automated weather stations. |

## weather-data

Use `weather-data <command> '<JSON arguments>'`. Run
`weather-data <command> --help` to get more information.

```sh
weather-data weather-history '{"q":"CITY","dt":"2025-06-01"}'
weather-data weather-astronomy '{"q":"CITY","dt":"2025-06-01"}'
```

| Command | Arguments | Description |
|---|---|---|
| `weather-data weather-history` | `{q: str, dt: str}` | Get historical weather for a location on a given date (YYYY-MM-DD). Args: q (str): Location query. dt (str): Date in YYYY-MM-DD format. Returns: dict: WeatherAPI history JSON. |
| `weather-data weather-astronomy` | `{q: str, dt: str}` | Get astronomy data (sunrise, sunset, moon) for a date (YYYY-MM-DD). Args: q (str): Location query. dt (str): Date in YYYY-MM-DD format. Returns: dict: WeatherAPI astronomy JSON. |

name	workspace-commands
description	Use when running commands in this workspace - which commands exist, what they can do, and what the interpreter supports.

Available commands

Python (python or python3), Perl, JavaScript/Node.js, and TypeScript runtimes are unavailable. Use the shell commands and task CLIs documented below; do not probe for or attempt to install other runtimes.

Standard Unix commands, among them:

cat  head  tail  ls  find  grep  wc  sort  uniq  cut  tr  sed  awk
diff  tee  xargs  jq

with pipes, > redirection and $(...) substitution.

Do not probe the machine with which, type, --version, env, ps, echo $PATH, ls /usr/bin or cat /usr/bin/<command>: they tell you nothing about the task.

A filename with a space in it needs quoting, as it would in any shell.

slack

Use slack <command> '<JSON arguments>'. Run slack <command> --help to get more information.

slack channels-list '{"channel_types":"public_channel,private_channel"}'
slack conversations-history '{"channel_id":"CHANNEL_ID","limit":"1d"}'
slack conversations-replies '{"channel_id":"CHANNEL_ID","thread_ts":"1234567890.123456"}'
slack conversations-search-messages '{"search_query":"QUERY","filter_in_channel":"CHANNEL_ID"}'

Command	Arguments	Description
`slack channels-list`	`{channel_types: str, cursor?: str, limit?: number = 100, sort?: str}`	Get list of channels
`slack conversations-add-message`	`{channel_id: str, content_type?: str = "text/markdown", payload?: str, thread_ts?: str}`	Add a message to a public channel, private channel, or direct message (DM, or IM) conversation by channel_id and thread_ts.
`slack conversations-history`	`{channel_id: str, cursor?: str, include_activity_messages?: bool = false, limit?: str = "1d"}`	Get messages from the channel (or DM) by channel_id, the last row/column in the response is used as 'cursor' parameter for pagination if not empty
`slack conversations-replies`	`{channel_id: str, cursor?: str, include_activity_messages?: bool = false, limit?: str = "1d", thread_ts: str}`	Get a thread of messages posted to a conversation by channelID and thread_ts, the last row/column in the response is used as 'cursor' parameter for pagination if not empty
`slack conversations-search-messages`	`{cursor?: str = "", filter_date_after?: str, filter_date_before?: str, filter_date_during?: str, filter_date_on?: str, filter_in_channel?: str, filter_in_im_or_mpim?: str, filter_threads_only?: bool, filter_users_from?: str, filter_users_with?: str, limit?: number = 20, search_query?: str}`	Search messages in a public channel, private channel, or direct message (DM, or IM) conversation using filters. All filters are optional, if not provided then search_query is required.

weather

Use weather <command> '<JSON arguments>'. Run weather <command> --help to get more information.

weather find-weather-stations '{"location":"40.7128,-74.0060"}'

Command	Arguments	Description
`weather find-weather-stations`	`{location: str, limit?: number = 10}`	Find weather observation stations near a location in the United States. Useful for getting station-specific data, finding data sources, or understanding which stations provide weather data for an area. Includes ASOS, AWOS, and other automated weather stations.

weather-data

Use weather-data <command> '<JSON arguments>'. Run weather-data <command> --help to get more information.

weather-data weather-history '{"q":"CITY","dt":"2025-06-01"}'
weather-data weather-astronomy '{"q":"CITY","dt":"2025-06-01"}'

Command	Arguments	Description
`weather-data weather-history`	`{q: str, dt: str}`	Get historical weather for a location on a given date (YYYY-MM-DD). Args: q (str): Location query. dt (str): Date in YYYY-MM-DD format. Returns: dict: WeatherAPI history JSON.
`weather-data weather-astronomy`	`{q: str, dt: str}`	Get astronomy data (sunrise, sunset, moon) for a date (YYYY-MM-DD). Args: q (str): Location query. dt (str): Date in YYYY-MM-DD format. Returns: dict: WeatherAPI astronomy JSON.

MCP tools

The MCP agent gets these 14 tools, each with its full input schema, in every request, as in the benchmark, and no system prompt. The Slack tools read the simulated workspace, the weather tools reply that the weather service is not reachable from here, and the files under /data/repos are empty for both agents.

Tool	Description
filesystem_list_directory	Get a detailed listing of all files and directories in a specified path. Results clearly distinguish between files and directories with [FILE] and [DIR] prefixes. This tool is essential for understanding directory structure and finding specific files within a directory. Only works within allowed directories.
filesystem_list_directory_with_sizes	Get a detailed listing of all files and directories in a specified path, including sizes. Results clearly distinguish between files and directories with [FILE] and [DIR] prefixes. This tool is useful for understanding directory structure and finding specific files within a directory. Only works within allowed directories.
filesystem_directory_tree	Get a recursive tree view of files and directories as a JSON structure. Each entry includes 'name', 'type' (file/directory), and 'children' for directories. Files have no children array, while directories always have a children array (which may be empty). The output is formatted with 2-space indentation for readability. Only works within allowed directories.
filesystem_search_files	Recursively search for files and directories matching a pattern. The patterns should be glob-style patterns that match paths relative to the working directory. Use pattern like '.ext' to match files in current directory, and '/.ext' to match files in all subdirectories. Returns full paths to all matching items. Great for finding files when you don't know their exact location. Only searches within allowed directories.
filesystem_list_allowed_directories	Returns the list of directories that this server is allowed to access. Subdirectories within these allowed directories are also accessible. Use this to understand which directories and their nested paths are available before trying to access files.
slack_channels_list	Get list of channels
slack_conversations_add_message	Add a message to a public channel, private channel, or direct message (DM, or IM) conversation by channel_id and thread_ts.
slack_conversations_history	Get messages from the channel (or DM) by channel_id, the last row/column in the response is used as 'cursor' parameter for pagination if not empty
slack_conversations_replies	Get a thread of messages posted to a conversation by channelID and thread_ts, the last row/column in the response is used as 'cursor' parameter for pagination if not empty
slack_conversations_search_messages	Search messages in a public channel, private channel, or direct message (DM, or IM) conversation using filters. All filters are optional, if not provided then search_query is required.
weather_find_weather_stations	Find weather observation stations near a location in the United States. Useful for getting station-specific data, finding data sources, or understanding which stations provide weather data for an area. Includes ASOS, AWOS, and other automated weather stations.
weather-data_weather_history	Get historical weather for a location on a given date (YYYY-MM-DD).
weather-data_weather_astronomy	Get astronomy data (sunrise, sunset, moon) for a date (YYYY-MM-DD).
filesystem_read_file	Read the complete contents of a file as text. DEPRECATED: Use read_text_file instead.

Try It Yourself

Type commands into a live terminal on the VFS agent's filesystem, simulated here in your browser from the benchmark's data. Your files are at /data and Slack at /slack, with the slack, weather and weather-data commands.