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Merged
simonpcouch merged 3 commits into from
Oct 29, 2025
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v0.2.0 release candidate #85

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abcf078
spruce up NEWS
simonpcouch Oct 29, 2025
c85c064
`devtools::build_readme()`
simonpcouch Oct 29, 2025
284103b
mcptools 0.2.0
simonpcouch Oct 29, 2025
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2 changes: 1 addition & 1 deletion DESCRIPTION
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Package: mcptools
Title: Model Context Protocol Servers and Clients
Version: 0.1.1.9001
Version: 0.2.0
Authors@R: c(
person("Simon", "Couch", , "[email protected]", role = c("aut", "cre"),
comment = c(ORCID = "0000-0001-5676-5107")),
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21 changes: 14 additions & 7 deletions NEWS.md
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# mcptools (development version)
# mcptools 0.2.0

* `mcp_tools()` now errors more informatively when an MCP server process exits unexpectedly (#82).
## Server

* `mcp_server()` now supports HTTP transport in addition to stdio. Use `type = "http"` to start an HTTP server, with optional `host` and `port` arguments. For now, the implementation is authless.

* JSON-RPC responses now retain an explicit `id = NULL` value, ensuring parse-error replies conform to the MCP specification.

* `mcp_server()` now formats tool results in the same way as ellmer (#78 by @gadenbuie).

* `mcp_tools()` now sends and receives a `"notifications/initialized"` (#77 by @galachad).
* `mcp_server()` gains logical argument `session_tools`, allowing users to opt-out of presenting R session tools (that make it possible to communicate with `mcp_session()`s) to clients.

* Several tightenings-up of the implementation:
- JSON-RPC responses now retain an explicit `id = NULL` value, ensuring parse-error replies conform to the MCP specification.
- `mcp_tools()` now sends and receives a `"notifications/initialized"` (#77 by @galachad).
- The implementation now supports the 2025-06-18 protocol version, updated from 2024-11-05.

* `mcp_session()` now returns invisibly the nanonext socket used for communicating with the server.
* `mcp_session()` now invisibly returns the nanonext socket used for communicating with the server.

* `mcp_server()` gains logical argument `session_tools`, allowing users to opt-out of presenting R sessions tools to clients.
## Client

- Notably, `mcp_tools()` did not gain an implementation of the HTTP transport. Instead, we now recommend the [mcp-remote](https://www.npmjs.com/package/mcp-remote) tool for serving local MCP servers via the HTTP transport in the documentation.

* `mcp_tools()` now errors more informatively when an MCP server process exits unexpectedly (#82).

# mcptools 0.1.1

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2 changes: 2 additions & 0 deletions README.md
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[![Lifecycle:
experimental](https://img.shields.io/badge/lifecycle-experimental-orange.svg)](https://lifecycle.r-lib.org/articles/stages.html#experimental)
[![CRAN
status](https://www.r-pkg.org/badges/version/mcptools)](https://CRAN.R-project.org/package=mcptools)
[![R-CMD-check](https://github.com/posit-dev/mcptools/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/posit-dev/mcptools/actions/workflows/R-CMD-check.yaml)
<!-- badges: end -->

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