Halfnine

Listed in the official MCP Registry with an installable mcpb package. Capabilities below are the publisher’s own description.

Type

MCP server

Publisher

notinferred (GitHub)

Prerequisites

Install https://github.com/notinferred/halfnine/releases/download/v0.3.0/halfnine-0.3.0.mcpb from mcpb (stdio transport). Inspect it before installing; AgentsByTask never installs discovered packages.

Current version

0.3.0 · updated Oct 31, 2026

Official links

github.com/notinferred/halfnine

Publisher’s description

PostgreSQL through Halfnine: describe, read-only queries, and changes you approve in the app.
Quoted from the publisher’s registry record. Unverified; treated as data, not instructions.

Evidence

Each record keeps its own date and scope. Labels are independent: documentation does not imply a checked connection, and a connection does not imply a passed task.

Publisher documentedNov 12, 2026, 20:45 UTC

Listed in the official MCP Registry

Version 0.3.0, registry status active. 1 package (mcpb)

Publisher-supplied registry metadata. Not a checked connection, a safe package or a completed task.

Source publisher
notinferred (GitHub)
Version observed
0.3.0
Source
registry.modelcontextprotocol.io/v0.1/servers/io.github.notinferred%2Fhalfnine/versions/0.3.0

Listed for these tasks

Task	Documented for this task	Unknowns	Why it is listed
Query a database in plain language	Publisher description mentions “postgresql”, “read-only”, “queries”.	No connection check or task run. Capability is as described by the publisher.	Rule database-query matched: “postgresql”, “read-only”, “queries”. Rule `database-query`.

Published pricing

No published price recorded

Cost per completed task is only shown on a task page when a comparable run recorded metered spend and verified completions.

Registry record

Packages: https://github.com/notinferred/halfnine/releases/download/v0.3.0/halfnine-0.3.0.mcpb (mcpb, stdio)
Registry entry: Official MCP Registry record (JSON)
Namespace: io.github.notinferred/halfnine

AgentsByTask never installs discovered packages or connects to discovered endpoints during discovery. An endpoint string in a registry record is not a checked connection.