2026-06-17 cursive | Clojure Slack Archive

cursive

onetom 2026-06-17T07:34:02.674759Z

if anyone is interested, we have a more chopped down implementation of a claude code intergration with multiple nrepl servers in a monorepo. it's a variation on the recommendations from the bhauman/clojure-mcp-light. 1 main difference is, that the discovery of running repls is done via the //.nrepl-port file, and the staleness of port number mentioned in it is checked by netcat.

onetom 2026-06-17T07:34:27.667179Z

we are driving the cursive repl server from claude code via 2 scripts 1. eval

#!/bin/sh

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
NREPL_PORT_FILE="$SCRIPT_DIR/.nrepl-port"
NREPL_PORT="$(cat "$NREPL_PORT_FILE")"

# Assume $NREPL_PORT is opened on the same host as this script is executing on
# which wouldn't be the case, if we see the $NREPL_PORT_FILE over a network
# filesystem.
if nc -z 0.0.0.0 "$NREPL_PORT"; then
    CLJ_EVAL_NREPL="$(which clj-nrepl-eval)"
    (cd "$SCRIPT_DIR" && direnv exec . "$CLJ_EVAL_NREPL" --port "$NREPL_PORT" "$@")
else
    # Remove presumably stale port file, to prevent AI seeing a stale port number
    test -f "$NREPL_PORT_FILE" && rm "$NREPL_PORT_FILE"
    cat <


2. start-nrepl-server:
#!/bin/sh

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "${SCRIPT_DIR}"
if [ -f deps.edn ]; then
    exec direnv exec . clojure -M:test:dev:nrepl "$@"
else
    echo "Missing ${SCRIPT_DIR}/deps.edn"; exit 1;
fi
which is introduced to claude via a /.claude/rules/clj-nrepl-eval.md:
---
origin: ""
---

# Clojure REPL Evaluation

This is a monorepo, containing multiple Clojure modules in subdirectories, each
containing an `eval` script, which you must use to run Clojure code, forms,
expressions, programs via nREPL for that module.

If there is no nREPL server process running for this project, the `eval` script
prints the shell command for starting it.

Ask the user whether they want to run that command and run in the background,
then retry the `eval` without any sleep!

`eval` accepts an optional `--timeout ` argument.

Always provide Clojure code via stdin!

Example:

shell
<module-dir>/eval --timeout 3000 <<'EOF'
(require 'some.name.space :reload)
EOF



Clojure code running in REPL should not read from stdin!

The REPL session persists between evaluations, so namespaces and state is
preserved.

Always use :reload when requiring namespaces to pick up source file changes.```

onetom 2026-06-17T07:39:09.114089Z
this article helped to formulate this specific solution too:
https://vlaaad.github.io/codex-in-the-repl

onetom 2026-06-17T07:39:48.568219Z
btw, this problem has re-appeared again on another machine, but we are still unclear on the reasons.
no more energy to debug it though, so we fell back to copy-pasting the REPL command's code into the REPL window directly, since we needed to eval it only a few times.
otherwise we are driving the cursive repl server from claude code

onetom 2026-06-17T07:46:31.325189Z
the root cause for these issues could be that we are trying to exclude the *.iml files from version control, because there is constant churn in them.

the ij project-root level iml file keeps changing its name in every new git-worktree, which in turn also modifies .idea/modules.xml.
since we don't commit these files anymore, on the 1st opening of worktree dir in intellij triggers a project discovery.

however, we do have some of the intellij and cursive configs under version control, like the .idea/repl-commands.xml, which might lead the initialization code in cursive towards some untested code-path.

 2026-06-17T15:28:23.834189Z
I have had to upgrade from intellij 2025.2 to 2026.1.1.

as is normally the case, my intellij cannot access the outside world and so cannot download leiningen. what I normally do is manually go and get leiningen jar manually and put it in the normal place ~/.lein/self-installs/leiningen-2.11.2-standalone.jar, then just make sure the intellij settings for lein match the version I have. then cursive does not try to download it.

However, with the new upgrade, cursive is still trying to download lein (when I 'add as lein project' from intellij). lein jar is there, with the right permissions, and confirmed lein works from the cmd line.

is there something else I can do to convince cursive not to try to download leiningen?

 2026-06-18T08:46:15.211609Z
seems to be working as normal today. phew

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