Quorum MCP server
online · 100% uptimeAttested multi-agent consensus: proposals, votes, and outcomes stamped and traced.
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If you have run it, two minutes of your experience saves the next person an afternoon.
Quorum tools (7, 2 write)
write = sends, deletes, buys or postshistoryFreeThe complete attested record of a proposal in chronological order: creation, every blackboard write, every vote with reasoning, the outcome. Optional filter: all | writes | votes | outcome.
proposeFreeOpen a new proposal: a question, named options, expected voter identities, an aggregation algorithm, a deadline, and a quorum threshold. Returns the proposal id, the creation attestation, and the deadline. All later operations key off the proposal id.
readFreeRead a proposal's blackboard: every write in order with timestamp, author, and attestation id -- the complete deliberation record, or filtered to one key.
registerFreeOPTIONAL one-time setup -- only needed if you want proposal telemetry (OTLP spans) pushed to your Telinea account. Call once before propose: it binds an api_key you choose to your Telinea API key. Afterwards, pass the same api_key on propose and every span for that proposal is pushed to your Telinea with standard OTLP bearer auth. Storage: the Telinea key is sealed with AES-256-GCM under a key derived from your api_key (HKDF-SHA256, per-account salt); only sha256(api_key) is kept as the lookup id, so neither key is ever stored in the clear. Re-registering with the same api_key rotates the stored Telinea key. Skip this tool entirely for anonymous use -- propose works without an api_key, just with no span streaming.
resolveFreeCompute and attest the outcome once quorum is met (or the deadline has passed). Idempotent: resolving twice returns the recorded outcome. Condorcet cycles and missed supermajority thresholds return co_winners with status unresolved rather than an arbitrary tiebreak.
votewrite actionFreeSubmit a vote from an expected voter identity, with optional reasoning stored in the attested record. Vote shape depends on the algorithm: plurality/supermajority take an option string; approval takes an option or list of options; borda takes a ranking of all options; condorcet takes a ranking or a single option; opinion_pool takes a probability distribution over options. Duplicates and post-deadline votes are rejected.
writewrite actionFreeAppend a key-value entry to a proposal's blackboard. Any agent may write; writes are appended, never replaced -- the full ordered history is preserved and attested.
Public scan report
scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 80ms20/20
- Tool poisoning7 tool descriptions checked15/15
- Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
- Maintenancelast push 0 days ago15/15
- Maintainer identityregistry namespace matches repository owner6/10
Findings (1)
- highWrite-action tools reachable without authentication
auth.open-write
How Quorum compares
Against every graded AI and agents MCP server, from our own scans and uptime checks. Updated after each scan run.
- Safety score
- 79/100
- higher than 58% of 4,460 AI and agents servers
- Tools
- 7
- the typical AI and agents server has 6
- Tools that change things
- 29%
- typical: 0%. Fewer write tools means less an agent can break
- Uptime
- 100%
- of our recent checks; the typical remote AI and agents server answers 100%
- Response time
- 356 ms
- faster than 39% of 2,331 AI and agents servers
What its tools let an agent do: 4 read · 2 create · 1 change
Install Quorum in Claude Code, Cursor or VS Code
claude mcp add --transport http quorum https://quorum-mcp.terradev.cloud/mcp
What the publisher says
From the Quorum repository's README, as published. We do not edit it. Read it on GitHub
Quorum
Attested multi-agent consensus with a shared blackboard — an MCP server.
An orchestrator opens a proposal, participating agents write context to a shared blackboard and vote with reasoning, Quorum applies a principled aggregation algorithm from the social choice literature, and every step — proposal, writes, votes, outcome — is attested via Stamp and traced to Telinea. The record is immutable, tamper-evident, and independently verifiable.
Hosted endpoint (no sign-in, public): https://quorum-mcp.terradev.cloud/mcp
Why
Majority vote among LLM agents fails on disputed questions because agents trained on overlapping data share systematic blind spots — they are not the independent voters the Condorcet Jury Theorem requires. And when agents do decide together, the decision process — who voted, what they said, what context they worked from — is invisible.
Quorum is the complete primitive: algorithm plus state plus provenance.
Tools
key you choose) to your telinea_key. The Telinea key is stored encrypted under a key derived from your Quorum key (AES-256-GCM, HKDF) — the Quorum key itself is never stored. Every span for your proposals is then pushed with your Telinea key, standard OTLP bearer auth.
- register — one-time account setup: bind your api_key (a Quorum
question, voters (expected identities), deadlineminutes. Optional: apikey (from register — binds the proposal to your Telinea account for span streaming; omit for anonymous use), namespace (tenant prefix — the id becomes ns:name, so different teams can reuse names without colliding), options (default ["yes","no"]), algorithm (default approval), quorum (min % of voters, default 100), threshold (supermajority share, default 66.67), description. Returns the proposal id, creation attestation id, deadline, and blackboard URI.
- propose — open a proposal: name (becomes the proposal id),
optional author. Writes are appended, never replaced — the full ordered history is preserved and attested.
- write — append key/value to the proposal's blackboard, with
author, and attestation id. Optional key filter. The deliberation record before voting.
- read — read the blackboard: every write in order with timestamp,
optional reasoning (stored in the attested record, never affects the outcome). Ballot shape depends on the algorithm — see below. Duplicate votes and post-deadline votes are rejected with structured errors.
- vote — submit a ballot from an expected voter identity, with
once quorum is met (or after the deadline); also fires automatically when the deadline passes with quorum. Idempotent. Condorcet cycles and missed supermajority thresholds return co_winners with status unresolved — genuine ambiguity is surfaced, never hidden.
- resolve — apply the algorithm and attest the outcome. Callable
every vote with reasoning, the outcome. Optional filter: all | writes | votes | outcome. The compliance artifact.
- history — the complete attested record: creation, every write,
Algorithms
The blackboard
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Quorum: common questions
- Is Quorum MCP server safe?
- Mostly: it is graded B (79/100). Read the Quorum safety report
- How do I install Quorum?
- It runs remotely at quorum-mcp.terradev.cloud. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Quorum need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Quorum maintained?
- The last commit was 38 days ago (2026-09-27). The latest release is v0.1.1.
- Is Quorum up?
- 100% of our last 28 checks got an answer. We check remote servers about four times a day.
- What can I use instead of Quorum?
- Servers from other publishers that do the same job: PaperBanana MCP server, Mnemoverse Memory MCP server and three.ws Brain MCP server.
- How does Quorum compare with other AI and agents MCP servers?
- safety score 79/100 (higher than 58% of 4,460 AI and agents servers); tools 7 (the typical AI and agents server has 6); tools that change things 29% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.
Alternatives to Quorum
Same job from other publishers: the closest match first, then the best rated.
- PaperBananaGenerate academic diagrams and statistical plots from text using multi-agent AI.not reviewedEstablishedA
- Mnemoverse MemoryHosted agent memory that learns from outcomes, with shared rooms. No key: mcp.mnemoverse.com/mcpnot reviewedEstablishedA
three.ws BrainList LLM providers and run chat completions through the three.ws multi-provider router.not reviewedEstablishedB- Claude PromptsReusable prompt templates, multi-step workflow chains, and quality gates for any MCP client.not reviewedEstablishedA
