Byteland
dev.byteland/bytelandbyteland.devstreamable-httpv0.5.0Scanned
A night city of developers: search people and projects, read project rooms, see who is live.
14 tools: 3 change things and 11 only read.
- Reads private data · 5
- Reads text others write · 4
- Can send data out · 0
- No findings
Anlyon alternative
3 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
14 tools
Changes things 3Claude Code: ask
aboutShort description of Byteland: what buildings, rooms and lights stand for, units, privacy rules and supported languages.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it Short description of Byteland: what buildings, rooms and lights stand for, units, privacy rules and supported languages. A good first call.
liveVoice rooms with people in them right now and the rooms with messages in the last 48 hours.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it Voice rooms with people in them right now and the rooms with messages in the last 48 hours. Voice presence comes from the running site (BYTELAND_URL, default http://127.0.0.1:8787); without it only the recent rooms are known.
popularThe leaderboard: buildings by unique visits this week (or period: "all"), the most viewed projects and the newest residents.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
Description, as the server wrote it The leaderboard: buildings by unique visits this week (or period: "all"), the most viewed projects and the newest residents. A visit counts once per person per day; owners do not count themselves.
Only reads 11Show 11 read-only tools
get_buildingPublic detail of one building: the owner’s profile, rooms and their states, machine-readable parts and the building recipe.No findings
Why it is in this group
- The name "get_building" says "get": a word for reading.
Description, as the server wrote it Public detail of one building: the owner’s profile, rooms and their states, machine-readable parts and the building recipe.
get_profileA developer’s or company’s profile: bio, links (GitHub, website, socials), badges, projects and open-source contributions.Reads text others writeNo findings
Why it is in this group
- The name "get_profile" says "get": a word for reading.
What it can reach
- untrusted-inputThe description's first sentence says "website": it reads web pages, which anyone can write.
Description, as the server wrote it A developer’s or company’s profile: bio, links (GitHub, website, socials), badges, projects and open-source contributions. If not on the street, looks for a saved profile, then GitHub; otherwise generates a sample (preview:true).
get_projectA single project of a profile.No findings
Why it is in this group
- The name "get_project" says "get": a word for reading.
Description, as the server wrote it A single project of a profile. Returns nothing for private projects.
get_statsUnique visits (all time and this week), project views, weekly rank and the last 14 days for one username.No findings
Why it is in this group
- The name "get_stats" says "get": a word for reading.
Description, as the server wrote it Unique visits (all time and this week), project views, weekly rank and the last 14 days for one username.
get_streetBuildings in a range (owner, type, floors, light counts) and gaps (alleys, empty lots).No findings
Why it is in this group
- The name "get_street" says "get": a word for reading.
Description, as the server wrote it Buildings in a range (owner, type, floors, light counts) and gaps (alleys, empty lots). Positions in centimetres, at most 80000 cm.
list_projectsA profile’s projects: state, description, stack, links (repo, site) plus open-source contributions.Reads private dataNo findings
Why it is in this group
- The name "list_projects" says "list": a word for reading.
What it can reach
- private-dataThe description's first sentence says "repo": it reads repositories.
Description, as the server wrote it A profile’s projects: state, description, stack, links (repo, site) plus open-source contributions. Private projects appear only as hidden:true.
list_roomsThe project rooms of a person that have been used (every public project of a resident has a room, open by default; one nobody wrote in is empty and not listed): mode (open or read-…Reads private dataReads text others writeNo findings
Why it is in this group
- The name "list_rooms" says "list": a word for reading.
What it can reach
- private-dataThe description's first sentence says "message": it reads messages.
- untrusted-inputThe description's first sentence says "message": it reads messages, which other people can write.
Description, as the server wrote it The project rooms of a person that have been used (every public project of a resident has a room, open by default; one nobody wrote in is empty and not listed): mode (open or read-only), channels with message counts, forum threads, last activity and how many are in voice. Closed rooms and private projects never appear.
preview_buildingBuilds a user's building as if it stood at the start of a street (GitHub repositories become rooms).Reads private dataNo findings
Why it is in this group
- The name "preview_building" says "preview": a word for reading.
What it can reach
- private-dataThe description's first sentence says "repository": it reads repositories.
Description, as the server wrote it Builds a user's building as if it stood at the start of a street (GitHub repositories become rooms). The preview is not added to the city. Append the returned url_hash to index.html to open it on the site.
read_roomThe latest messages of one channel of a project room (default: its first channel) and the forum threads (idea, review, question, announcement) with reply and reaction counts.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "read_room" says "read": a word for reading.
What it can reach
- private-dataThe description's first sentence says "message": it reads messages.
- untrusted-inputThe description's first sentence says "message": it reads messages, which other people can write.
Description, as the server wrote it The latest messages of one channel of a project room (default: its first channel) and the forum threads (idea, review, question, announcement) with reply and reaction counts.
read_threadOne forum thread of a project room with all of its replies and reactions.Reads private dataReads text others writeNo findings
Why it is in this group
- The name "read_thread" says "read": a word for reading.
What it can reach
- private-dataThe name "read_thread" says "read" and "thread": it reads messages.
- private-dataThe description's first sentence says "thread": it reads messages.
- untrusted-inputThe name "read_thread" says "read" and "thread": it reads messages, which other people can write.
- untrusted-inputThe description's first sentence says "thread": it reads messages, which other people can write.
Description, as the server wrote it One forum thread of a project room with all of its replies and reactions.
searchFind people, projects and stacks across every resident of the city (people, projects, stacks), plus buildings on the street by username, name, project or technology (results).No findings
Why it is in this group
- The name "search" says "search": a word for reading.
Description, as the server wrote it Find people, projects and stacks across every resident of the city (people, projects, stacks), plus buildings on the street by username, name, project or technology (results). Private projects never appear.
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged outbound.
- Reads private data5
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write4
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 0.5.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http byteland https://byteland.dev/mcpclaude mcp add --transport http byteland https://byteland.dev/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__byteland__get_street",
"mcp__byteland__get_building",
"mcp__byteland__get_profile",
"mcp__byteland__list_projects",
"mcp__byteland__get_project",
"mcp__byteland__search",
"mcp__byteland__get_stats",
"mcp__byteland__list_rooms",
"mcp__byteland__read_room",
"mcp__byteland__read_thread",
"mcp__byteland__preview_building"
],
"ask": [
"mcp__byteland__about",
"mcp__byteland__popular",
"mcp__byteland__live"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as byteland. Review it before you use it.
Capability tags behind 6 rules
- mcp__byteland__get_profile untrusted-input
- mcp__byteland__list_projects private-data
- mcp__byteland__list_rooms private-data, untrusted-input
- mcp__byteland__read_room private-data, untrusted-input
- mcp__byteland__read_thread private-data, untrusted-input
- mcp__byteland__preview_building private-data
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/dev.byteland/byteland/verify?hash=a91b526dd34e15bc69b4fa5f0b9ad4eb37dde810b88391199819b9801c603ebd" | jq -e '.changed == false'Pinned hash a91b526dd34e, from Nov 1, 2026, 02:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/dev.byteland/byteland/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/dev.byteland/byteland)Source: MCP Registry. Synced Nov 1, 2026, 02:17 UTC.