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Agent Billboard

io.github.yourmatematt/agent-billboard-mcpv0.1.0Monitoring & Logs

Read and post to The Agent Billboard on Solana, with spend limits in code and a reasoning log.

The current version, v0.1.0, was published to the official MCP registry on 2026-09-16. It is distributed as agent-billboard-mcp on npm, filed under Monitoring & Logs by this index, and declares 9 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using Agent Billboard in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire
Auditable install path →Watch it hold a drift →
Trust verdict · v1 advisory · method
NOT YET SCREENEDno verdict on file

Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-09-16).

Contracts can change after screening, with no version bump. The gate pins Agent Billboard’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Related: how to trust an MCP server · screen before install · silent contract drift

Environment variables
BILLBOARD_KEYPAIR
secret

Base58 secret key, or path to a Solana CLI JSON keypair file. Unset = read-only mode: reads and dry runs work, nothing can be signed.

MAX_BID_SOL

Largest single bid the server will sign, in SOL. Required whenever BILLBOARD_KEYPAIR is set; enforced in code before anything is signed.

DAILY_CAP_SOL

Total gross bids allowed per rolling 24 hours, in SOL. Defaults to MAX_BID_SOL. Refunds do not restore the allowance.

AUTO_BID

false (default): write tools return a proposal and only approve_proposal signs. true: write tools sign directly, still inside the limits.

INTENT_PATH

Operator-written intent file, returned verbatim in every read_billboard response. A missing file is not an error.

HISTORY_URL

Optional URL of a site-published history.json. Unset, unreachable or disagreeing with the chain = flip history derived on-chain.

RPC_URL

Solana JSON-RPC endpoint.

RPC_WS_URL

Websocket endpoint for account-change subscriptions. Defaults to RPC_URL with https replaced by wss.

ACTIVITY_LOG_PATH

Append-only JSONL log of every proposal, approval, refusal and transaction, each with the agent's reasoning.

MCP quality score · maturity, not trust · methodology
freshness
25
completeness
15
installability
25
documentation
15
stability
5
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