MCP + Claude Plugin

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DB Import tool is in. Without bells and whistles yet: all the DB config, =
and picking a data source for your DataMap should be done in the =
Modeler. Also, I created a Claude "plugin" for typical Cayenne workflow. =
It is worth installing (see =
https://github.com/apache/cayenne/tree/master/ai-plugin), as it knows =
everything about the MCP and can orchestrate all the steps:

=E2=9D=AF rerun db import

=E2=8F=BA Skill(apache-cayenne:cayenne-reverse-engineer)
  =E2=8E=BF Successfully loaded skill
=E2=8F=BA Let me locate the Cayenne project file first.
=E2=8F=BA Import succeeded. One entity was added to the datamap DataMap. =
Want me to regenerate the Java classes with cgen now?

> yes

=E2=8F=BA Skill(apache-cayenne:cayenne-cgen)
  =E2=8E=BF Successfully loaded skill
=E2=8F=BA All 96 files are already up to date =E2=80=94 nothing needed =
to be written. The newly imported entity may have merged into an =
existing class, or its Java class was already current. No changes to the =
source tree.

Andrus


> On May 19, 2026, at 5:28=E2=80=AFPM, Andrus Adamchik =
<[email protected]> wrote:
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> [moving this to dev]
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> 2. "open_project" tool is committed. If anyone has a Windows machine =
handy, appreciate if you could build Modeler from master ("mvn clean =
verify -Passembly,windows") and see if project opening works there.
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> I also added "Agentic Coding" chapter to the docs that should help =
with installation and sample prompts:
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> =
https://github.com/apache/cayenne/tree/master/docs/asciidoc/cayenne-guide/=
src/docs/asciidoc/_cayenne-guide/part3
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> 3. Next is the hardest tool - DB Import. It requires linking XML =
import config with a Modeler-defined DataSource. So will likely need to =
share Modeler preferences with the MCP Server and make the agent steer =
the user to "open_project" to create new datasources and link the =
project to one of them.=20
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> Also, an interesting bit that I haven't fully thought through yet - =
smart relationship naming. Our current naming algorithm can do simple =
English plurals and that's about it. E.g., when 2 entities have more =
than one relationship between them based on multiple FKs, you'd often =
get meaningless names like "targets1", "targets2" (specifically for the =
to-many part). A model should be able to inspect FKs and create proper =
phrases ("manager" -> "managedBy"). And this can go further - we (or the =
users) can provide naming "skills" for a particular style, etc. Fun =
stuff.
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> Thanks,
> Andrus
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>> On May 12, 2026, at 5:16=E2=80=AFPM, Andrus Adamchik =
<[email protected]> wrote:
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>> Hi,
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>> A heads up... We are building an MCP server to integrate Modeler with =
agentic coding flows. It will be released with 5.0-M2. If you feel like =
compiling Cayenne  and trying it right away, the code is sitting on the =
"master" branch (Cayenne 5.0). At the moment it provides the "cgen" =
tool. For a sample session and install instructions, follow this link =
("Development build" section will be the most relevant):
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>> =
https://github.com/apache/cayenne/blob/master/cayenne-mcp-server/README.md=

>>=20
>> Of course, the prompt is just "generate java classes from the Cayenne =
mapping" :)=20
>>=20
>> Stay tuned for more tools and send feedback!
>>=20
>> Andrus
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