Roadmap

presa aims to be a complete MCP library for Clojure: servers and clients, for Babashka and the JVM from the same source. snodo (Elixir) is the reference for features and protocol behavior, and the official MCP conformance runner is the measure. The wire details presa follows are in wire-2026-07-28.md; what real hosts send is in hosts.md.

Each milestone lands as its own branch with tests under bb and the JVM.

1. Server surface

• [x] Tools: list and call, text and structured results, isError
• [x] server/discover, per-request _meta validation, -32022
• [x] Initialize-era opt-in (2025-11-25, 2025-06-18)
• [x] stdio transport, requests run concurrently
• [x] Resources, resource templates, resources/read, resource not found
• [x] Prompts: list and get
• [x] completion/complete
• [x] Pagination with opaque cursors
• [x] Caching hints (ttlMs, cacheScope)
• [x] Content helpers: image, audio, resource links, embedded resources
• [x] Logging (notifications/message, logLevel) and progress (notifications/progress) from handlers
• [x] Cancellation (notifications/cancelled)

2. Multi round-trip requests

• [x] input_required results with elicitation, sampling and roots requests
• [x] requestState that the server can trust (signed)
• [x] Capability checks against the client's declared capabilities

3. Streamable HTTP

• [x] Server over http-kit: JSON and SSE responses, protocol headers, Origin and Host checks against DNS rebinding
• [x] Initialize-era sessions over HTTP (Mcp-Session-Id)

4. Conformance

• [x] A fixture server with the runner's scenario tools, resources and prompts
• [x] A script that runs the official runner's server leg against it, with a recorded baseline

5. Client

• [x] In-process and stdio connections
• [x] HTTP connections
• [x] Version negotiation: server/discover, falling back to initialize
• [x] Tools, resources, prompts and completion calls, with pagination
• [x] Answering input_required with caller-supplied elicitation, sampling and roots functions
• [x] Turning a server's tools into functions
• [x] The runner's client leg, at 2026-07-28 and 2025-11-25

6. Done since

• [x] The conformance server leg at 2025-11-25 and 2025-06-18
• [x] subscriptions/listen, with list-changed! and resource-updated!
• [x] Basic JSON Schema validation of tool arguments and output (presa.schema)
• [x] CI: tests on Babashka and the JVM, conventions, conformance lanes against baselines, a weekly canary

Backlog

The first backlog (joshrotenberg/presa#5 to joshrotenberg/presa#22) is done: the client conformance leg, Tasks, the OAuth resource server and client, runtime catalogs, limits, the session event stream, client caching, full JSON Schema validation, initialize-era schema rules, notification checks, scoped cancellation, instrumentation, the proxy, the guides, the release process, lint prefixes and the wire schema check.

The second (joshrotenberg/presa#42 to joshrotenberg/presa#50) is done too: DPoP, the JWT-bearer and enterprise-managed grants, task status notifications on subscriptions/listen, proxy log and input forwarding, the notebook example, and a fix for a client lane flake. Before the first release, scope checks were extended to completion and resource subscriptions, and the JWT verifier was made to require exp.

Open work is filed as issues, labelled by priority and area: https://github.com/joshrotenberg/presa/issues. At the time of writing:

Issue	Priority
none open