About Nessy
Nessy is an MCP server published by jwcarman in the Agents category: nessy — an AI agent harness framework for Java.
The repository has 2 stars and 0 forks, with the last commit 10 days ago. Recent commit activity is the strongest signal that reported issues will get attention.
Install
From source
git clone https://github.com/jwcarman/nessyThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Ask AI
✦
Ask AI about Nessy
Powered by Claude · Grounded in docs
I know everything about Nessy. Ask me about installation, configuration, usage, or troubleshooting.
Security checks
6 checks have not been run yet.
Releases
0.7.00.7.0 · 7 Oct 2026Breaking and upgrade notes Read these before upgrading from 0.6.0. `nessy_agent_turn` has a new `label VARCHAR(1000) NOT NULL` column.** The schema never alters an existing table, so a database created by 0.6.0 must drop and recreate…
0.6.00.6.0 · 7 Oct 2026Breaking and upgrade notes `DirectBackend` and `QueuedBackend` have a new method, `turns()`**, which returns the `AgentTurns` store. An application with its own backend implementation must add it; the JDBC and in-memory backends already…
0.5.00.5.0 · 6 Oct 2026Breaking changes `Outcome` is `AskOutcome`.** `DirectHarness.ask` returns `AskOutcome<O>`, with the same arms `Answered`, `Refused`, `Failed` and `Busy`, and a fifth, `Terminated`. Asking a terminated agent returns `AskOutcome.Terminated`,…
0.4.00.4.0 · 3 Oct 2026Breaking changes `ApprovalRequest.callKey()` is replaced by `idempotencyKey()`**, a typed `IdempotencyKey` wrapping a UUID. `callKey()` was `turn/callId`: unique only within one agent, and not even there when a model repeats a call id…
0.3.00.3.0 · 3 Oct 2026Upgrading from 0.2.0: recreate the database (the schema changed and old data cannot be read), give `JdbcNotebook`, `JdbcPlans` and `JdbcChapters` a `CodecFactory`, replace any `ActionRenderer` with a `Stringifier` on `ToolConfig.action`,…