[SPARK-56074][INFRA] Improve AGENTS.md with inline build/test commands, PR workflow, and dev notes by cloud-fan · Pull Request #54899 · apache/spark

cloud-fan · 2026-03-19T05:26:35Z

What changes were proposed in this pull request?

Rewrite AGENTS.md to follow industry best practices for AI coding agent instructions:

Add concise project overview
Git pre-flight checks (uncommitted changes, branch state) before making edits
Inline actionable SBT build/test commands instead of links to docs
PySpark test setup with venv and Python version check
Development notes for SQLQueryTestSuite golden file tests and Spark Connect proto definitions
PR workflow guidelines (title format, description template, fork/upstream workflow)
Add CLAUDE.md as a symlink to AGENTS.md so Claude Code also picks up the instructions

Why are the changes needed?

The existing AGENTS.md only contained links to build docs, which AI coding agents cannot follow. The rewrite provides inline commands and actionable guidance that agents can directly use. All commands have been verified to work.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

All build and test commands were manually verified:

build/sbt sql/compile, build/sbt sql/Test/compile
build/sbt "sql/testOnly *MySuite", build/sbt "sql/testOnly *MySuite -- -z \"test name\""
PySpark venv setup and python/run-tests with both test suite and single test case
Confirmed OBJC_DISABLE_INITIALIZE_FORK_SAFETY is no longer needed on macOS

Was this patch authored or co-authored using generative AI tooling?

Generated-by: Claude Opus 4.6

…w, and dev notes Rewrite AGENTS.md to follow industry best practices: inline actionable commands instead of links, add project overview, git pre-flight checks, PySpark venv setup, development notes for SQLQueryTestSuite and Spark Connect protos, and PR workflow guidelines. Add CLAUDE.md as a symlink so Claude Code also picks up the instructions. Generated-by: Claude Opus 4.6 Co-authored-by: Isaac

cloud-fan · 2026-03-19T05:28:35Z

cc @yaooqinn @dongjoon-hyun @HyukjinKwon

cloud-fan · 2026-03-19T05:29:09Z

AGENTS.md

+    > project sql
+    > testOnly *MySuite
+
+### PySpark Tests


also cc @gaogaotiantian @Yicong-Huang for the pyspark test part.

dongjoon-hyun

Please use JIRA IDs for trace-ability, @cloud-fan , because this is very hot area in these days.

AGENTS.md

gaogaotiantian · 2026-03-19T05:38:34Z

AGENTS.md

+
+    build/sbt -Phive package
+
+Set up and activate a virtual environment (Python 3.10+):


For many python developers, we have more than 1 venv in the working directory, with names that contains the python version in it. (We probably have uv developers but let's deal with it when they speak). Checking .venv here is too ideal - I don't have a .venv directory in any of my dev machine, I have something like venv3.12.

Do we assume the agent work from a new terminal or in the current user terminal session? They are probably smart enough to find the venv directory in root directory and activate it. If not, we should help them.

The agent is supposed to work under the spark directory, this .venv is inside the spark directory. Do we need to have multiple virtual envs for the spark project?

BTW, I pick .venv as it's kind of a industry standard to put venv profile under the project dir, and seems people start using it already: #53836

It's common to use .venv as the virtualenv dir but it's far from being industry standard. Even CPython docs mentioned two:

Contained in a directory, conventionally named .venv or venv in the project directory, or under a container directory for lots of virtual environments, such as ~/.virtualenvs.

Unfortunately we do need multiple virtual envs to develop spark, at least pyspark. We support all official Python versions and it's not uncommon to have issues that only reproduce on a specific Python version. Also python3 often does not point to the python version we really want to use.

Currently I have two virtual env directories under spark and I probably will have more in the future.

Actually, if I remember correctly, our fragile type annotation can only pass on a specific python version (3.12 for now). Oh and I think it reports an error if you just pip install -r dev/requirements.txt because it has a slightly different version for numpy or its stub.. Then I realize maybe it's helpful to add the lint/format/type system to this file too because we do not do industry standard either.

That being said, I don't have a perfect solution for python environment management for agents - I don't have enough knowledge about how it would work better. Python environment management is not the best part of Python, but we still need to deal with it.

For my experience, I just let my agent create a venv for me if not pointed by me. However, I often do not create it under spark root as it is not picked up by .gitignore (yet?).
Given that there is no standard, maybe just let agent choose one location to prepare a venv if not already given?

dongjoon-hyun · 2026-03-19T05:38:51Z

AGENTS.md

+
+    build/sbt -Phive package
+
+Set up and activate a virtual environment (Python 3.10+):


Well, this means we need to update this AGENTS.md file every time we deprecate a Python version. Can we make this as robust as possible which we don't need to edit this file?

I removed it, python/run-tests already verifies python versions

dongjoon-hyun · 2026-03-19T05:39:49Z

AGENTS.md

+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` or `[MINOR] Title` for trivial changes.


If possible, let's avoid to mention MINOR here.

gaogaotiantian · 2026-03-19T05:41:33Z

AGENTS.md

+Contributors push their feature branch to their personal fork and open PRs against `master` on the upstream Apache Spark repo. Run `git remote -v` to identify which remote is the fork and which is upstream (`apache/spark`). If the remotes are unclear, ask the user to set them up following the standard convention (`origin` for the fork, `upstream` for `apache/spark`).

- **PySpark Testing**: [python/docs/source/development/testing.rst](python/docs/source/development/testing.rst)
+Use `gh pr create` to open PRs. If `gh` is not installed, generate the GitHub PR URL for the user and recommend installing the GitHub CLI.


This would be pretty useless if the agent does not have access to JIRA.

it does not just save the clicking create PR button, but also generates PR title and description.

I gave my agent access to JIRA. all you need is a Personal Access Token. maybe we can add it?

dongjoon-hyun · 2026-03-19T05:43:52Z

AGENTS.md

+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` or `[MINOR] Title` for trivial changes.


Shall we add an instruction to ask the user to get the SPARK-XXX ID?

second this. my agents sometimes hallucinate a SPARK ID for me. It will be good to tell them a source to get this ID.

… drop Python version check Co-authored-by: Isaac

cloud-fan · 2026-03-19T05:50:29Z

Addressed review comment: removed [MINOR] from the PR title format. Also dropped the hardcoded Python version check from the venv setup — python/run-tests already enforces the minimum version.

Co-authored-by: Isaac

…re push Co-authored-by: Isaac

dongjoon-hyun · 2026-03-19T05:55:25Z

BTW, I sent an email to Spark mailing list in order to request for feedback. Thank you, Wenchen. This becomes more and more important .

https://lists.apache.org/thread/nnfd2k75w4cmbsj7480mtm7q2g1n9fcm

holdenk · 2026-03-19T05:59:06Z

AGENTS.md

+## Pull Request Workflow
+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` where `SPARK-xxxx` is the JIRA ticket ID. Ask the user to create a new ticket or provide an existing one if not given.
+For follow-up fixes: `[SPARK-xxxx][COMPONENT][FOLLOWUP] Title`.
+
+### PR Description
+
+Follow the template in `.github/PULL_REQUEST_TEMPLATE`.


How about telling it not to raise PRs without a human review beforehand?

Or more accurately: I'd rather leave this part out, I still want a human to make the PRs.

https://github.com/apache/spark/pull/54899/changes#diff-a54ff182c7e8acf56acfd6e4b9c3ff41e2c41a31c9b211b2deb9df75d9a478f9R84

I asked llm to get human approval before pushing commits and creating PRs, does it address your concern?

That's probably fine although I'd still rather have the humans make the PR (this isn't a big time saver to have the AI agent do it and in making the PR hopefully they'd do the review).

To be clear: I think we can go with this and revisit if it becomes a problem

Yeah I actually want to push people to review the code as initial reviewer and write the PR title and description by themselves. Someone shouldn't claim the outcome of LLM as their own if they do not understand what the code is, and I'm kind of worry that making the process easier might eventually end up with proceeding to what LLM suggests blindly.

But we have a belief among community, and more likely people who want to delegate the effort for the PR can just do the same with one more prompt (no way to prevent it), so it's probably not a big deal.

Co-authored-by: Isaac

dongjoon-hyun

+1, LGTM. Thank you for addressing my comments, @cloud-fan .

yaooqinn · 2026-03-19T06:24:42Z

AGENTS.md

 # Apache Spark

-This file provides context and guidelines for AI coding assistants working with the Apache Spark codebase.
+Apache Spark is a multi-language engine for large-scale data processing and analytics, primarily written in Scala and Java. It supports both batch and streaming workloads, with Spark Connect as an optional server-client protocol.


we don't need this for agentic tools

Yeah I'm not actually very sure how this would be useful for Agent. Do we see its usefulness?

Actually the entire overview section can be removed, as llm should be very familiar with Spark. But searching from web, it's very common to put an overview section with some general info.

https://github.com/apache/airflow/blob/main/AGENTS.md

yaooqinn · 2026-03-19T06:25:31Z

AGENTS.md

+
+## Before Making Changes
+
+Before the first edit in a session, check the git state:


just using github worktree?

I also think we should use worktree.

I think the it is up to developers to add new worktree?

git worktree is a bit more heavy (a whole cope of all files) and I don't use it very often in my development. Maybe we can improve the If there are uncommitted changes part, and ask users whether they want to create a new worktree or not.

When developer use agentic tools heavily, they will get the point how worktree helps, you know, you don't need to work on a single PR at a time with AI

worktree can help with multi tasking and sub agents, which is kind of hard with branches. I think at one point the little heavy overhead can be justified. I adapted to worktree pretty quickly.

yaooqinn · 2026-03-19T06:27:24Z

AGENTS.md

+
+## Development Notes
+
+SQL golden file tests are managed by `SQLQueryTestSuite` and its variants. Read the class documentation before running or updating these tests.


For rules and notes of a specific areas, can we only use Agents.md as a menu not details

it's already menu like, this note asks llm to read details in the classdoc.

yaooqinn · 2026-03-19T06:34:44Z

For best practices, AGENTS.md file shall be capped most 100 lines. The current content is too specific.
Consider making the free-formed text more structural

yaooqinn · 2026-03-19T06:38:11Z

AGENTS.md

+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` where `SPARK-xxxx` is the JIRA ticket ID. Ask the user to create a new ticket or provide an existing one if not given.
+For follow-up fixes: `[SPARK-xxxx][COMPONENT][FOLLOWUP] Title`.
+
+### PR Description
+
+Follow the template in `.github/PULL_REQUEST_TEMPLATE`.


the PR title and desc is very much easy thing for AI-tools to learn, it consumes too much room from the AGENTS.md actually

Yicong-Huang · 2026-03-19T06:28:51Z

AGENTS.md

+
+Before the first edit in a session, check the git state:
+1. If there are uncommitted changes, ask the user whether to continue editing or stash/commit first.
+2. If the branch is `master`, or has new commits compared to `master` (check with `git log master..HEAD`), create a new branch from `master` before editing. Inform the user of the new branch name.


I don't know if we should add the pull from upstream master, just so that the new branch is branched out from a newer master. I think my local agent always forgets to pull from upstream, but instead always pull from origin/master which is my fork and states that it is the latest already.

Yicong-Huang · 2026-03-19T06:31:15Z

AGENTS.md

+
+    build/sbt -Phive package
+
+Set up and activate a virtual environment (Python 3.10+):


For my experience, I just let my agent create a venv for me if not pointed by me. However, I often do not create it under spark root as it is not picked up by .gitignore (yet?).
Given that there is no standard, maybe just let agent choose one location to prepare a venv if not already given?

Yicong-Huang · 2026-03-19T06:32:54Z

AGENTS.md

+Set up and activate a virtual environment (Python 3.10+):
+
+    if [ ! -d .venv ]; then
+        python3 -c "import sys; assert sys.version_info >= (3, 10)" || { echo "Python 3.10+ required. Ask the user to install a compatible version."; exit 1; }


I know we support 3.10+, but is it a good idea to use a more recent Python for development? especially our CI environments are 3.12. So using a version similar to CI might help prevent some issues.

Yicong-Huang · 2026-03-19T06:35:19Z

AGENTS.md

+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` or `[MINOR] Title` for trivial changes.


second this. my agents sometimes hallucinate a SPARK ID for me. It will be good to tell them a source to get this ID.

Yicong-Huang · 2026-03-19T06:36:23Z

AGENTS.md

+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` or `[MINOR] Title` for trivial changes.


shall we add those supported components explicitly? e.g., [PYTHON], [SS], [TEST], [DOCS], otherwise where can it find this information?

Yicong-Huang · 2026-03-19T06:38:12Z

AGENTS.md

+Contributors push their feature branch to their personal fork and open PRs against `master` on the upstream Apache Spark repo. Run `git remote -v` to identify which remote is the fork and which is upstream (`apache/spark`). If the remotes are unclear, ask the user to set them up following the standard convention (`origin` for the fork, `upstream` for `apache/spark`).

- **PySpark Testing**: [python/docs/source/development/testing.rst](python/docs/source/development/testing.rst)
+Use `gh pr create` to open PRs. If `gh` is not installed, generate the GitHub PR URL for the user and recommend installing the GitHub CLI.


I gave my agent access to JIRA. all you need is a Personal Access Token. maybe we can add it?

szehon-ho · 2026-03-19T06:40:25Z

AGENTS.md

 ## Build and Test

-Prefer building in sbt over maven:
+Prefer SBT over Maven for day-to-day development (faster incremental compilation). Replace `sql` below with the target module (e.g., `core`, `catalyst`, `connect`).


My cursor somehow tries a few random names for a module like 'sql' before it finds it. Wonder did you see it too, and this also helped it?

last time @HyukjinKwon mentioned to not duplicate the doc and just point, it's an alternative too to enhance the doc, but not sure

for majority of other docs, I think it's better to leave a pointer here rather than copy paste data. but build and test is pretty stable (less likely to be changed very often), yet it would be very frequently used by the agent. So I actually would prefer just have the instructions copy pasted in this doc.

szehon-ho · 2026-03-19T06:41:59Z

AGENTS.md

-  - SBT build instructions: See the ["Building with SBT"](docs/building-spark.md#building-with-sbt) section
-  - SBT testing: See the ["Testing with SBT"](docs/building-spark.md#testing-with-sbt) section
-  - Running individual tests: See the ["Running Individual Tests"](docs/building-spark.md#running-individual-tests) section
+Contributors push their feature branch to their personal fork and open PRs against `master` on the upstream Apache Spark repo. Run `git remote -v` to identify which remote is the fork and which is upstream (`apache/spark`). If the remotes are unclear, ask the user to set them up following the standard convention (`origin` for the fork, `upstream` for `apache/spark`).


nice, is it, so one can say 'make a pr that does this'?

jzhuge · 2026-03-19T06:50:02Z

Thanks for adding these. The context is much more useful to agents than links to docs.

However, I feel it is a bit over-engineered. Shorter is better for agent instructions, reducing noise and cost. The most valuable content is the non-obvious or unique stuff:

PySpark requires a prior build step
Golden file tests → read SQLQueryTestSuite docs
Proto changes → read the README first
PR title format
...

vaquarkhan

Two suggestions that have become standard practice for AGENTS.md in large monorepos:

Add an "Architecture Boundaries" section with explicit negative constraints.

AI agents frequently hallucinate legacy patterns or bypass isolation layers. The most effective guardrail is a short "Never Do" list. For Spark, the critical ones are:

Architecture Boundaries

Spark Connect: Uses a decoupled client-server architecture communicating via gRPC. Never share JVM memory or state between the client (sql/connect/client/) and the server (sql/connect/server/).
Dependencies: Never introduce cyclic dependencies. common/utils is foundational; higher-level modules like sql/core must not pull in dependencies that violate the module hierarchy.
Generated Files: Never hand-edit SQL golden files (sql/core/src/test/resources/sql-tests/results/) or generated Protobuf files. Regenerate golden files with SPARK_GENERATE_GOLDEN_FILES=1 and protos with dev/connect-gen-protos.sh.

Establish the federated AGENTS.md pattern.

The AGENTS.md spec now explicitly supports subdirectory placement with nearest-wins cascading. To keep this root file lightweight (~100 lines) and establish that module-specific rules belong in nested files, add a note at the top:

Note: For component-specific instructions, look for nested AGENTS.md files in subdirectories (e.g., sql/AGENTS.md, python/AGENTS.md). Agents read the nearest file in the directory tree, so the closest one takes precedence.
This aligns with @yaooqinn's comment about keeping this file as a menu rather than details ;sub-projects like PySpark or Catalyst can define their own hyper-specific guardrails locally without bloating the root file.

cloud-fan · 2026-03-19T08:46:22Z

@vaquarkhan I think eventually AGENTS.md should contains architecture overview, but it will need more time to get consensus on it (Spark is large project with many modules, many architectures at different granularity).

I want to only include dev ops related stuff in the first version, which already need a lot of time to reach agreement (see the discussions we have now).

I'll keep this PR open for a few days to collect more feedback.

mgaido91 · 2026-03-19T09:03:53Z

AGENTS.md

+
+### PR Title
+
+Format: `[SPARK-xxxx][COMPONENT] Title` where `SPARK-xxxx` is the JIRA ticket ID. Ask the user to create a new ticket or provide an existing one if not given.


Shall we specify which are the allowed values for COMPONENT?

I don't think we have a clear rule and llm should be able to figure it out. For example, we use [SQL] a lot but the actual module names are catalyst, sql/core, hive, etc.

…ceholders, simplify PR section Co-authored-by: Isaac

cloud-fan · 2026-03-19T10:23:29Z

AGENTS.md

+
+    build/sbt -Phive package
+
+Activate the virtual environment specified by the user, or default to `~/.virtualenvs/pyspark`:


@gaogaotiantian how about this? we give more control to the users.

users can say "run test ... with venv at <path>".

I think the agent should try to locate a virtual env at root dir of the repo, instead of a global user venv. If no venv is found, agent can create a venv or .venv at the root dir of the repo.

cloud-fan · 2026-03-19T10:53:05Z

AGENTS.md

-This file provides context and guidelines for AI coding assistants working with the Apache Spark codebase.
+## Before Making Changes
+
+Before the first edit in a session, ensure a clean working environment:


This is the common issue I hit when working with llm. Sometimes I forgot to clean up the working env and asking llm to make changes, it just did so and mess up my working env.

Keep it simple and mandatory, without any conditions, otherwise, agent is tricky with conditional guidelines

DON'T include any unrelated changes

cloud-fan · 2026-03-19T10:54:01Z

AGENTS.md

-  - SBT build instructions: See the ["Building with SBT"](docs/building-spark.md#building-with-sbt) section
-  - SBT testing: See the ["Testing with SBT"](docs/building-spark.md#testing-with-sbt) section
-  - Running individual tests: See the ["Running Individual Tests"](docs/building-spark.md#running-individual-tests) section
+Contributors push their feature branch to their personal fork and open PRs against `master` on the upstream Apache Spark repo.


This is another common mistake. llm pushed my branch to upstream apache many times...

For agent, we'd keep it simple, for example

MUST push to my fork

yaooqinn · 2026-03-19T11:26:01Z

CLAUDE.md

@@ -0,0 +1 @@
+AGENTS.md


Do we need this? AGENTS.md is now like an open standard for project harness

seems not well supported: anthropics/claude-code#34235

vaquarkhan · 2026-03-19T15:32:41Z

@vaquarkhan I think eventually AGENTS.md should contains architecture overview, but it will need more time to get consensus on it (Spark is large project with many modules, many architectures at different granularity).

I want to only include dev ops related stuff in the first version, which already need a lot of time to reach agreement (see the discussions we have now).

I'll keep this PR open for a few days to collect more feedback.

@cloud-fan That makes complete sense. Getting community consensus on global architecture boundaries for a project as massive as Spark would definitely stall this PR. Starting strictly with the DevOps, build, and test instructions is a great v1.

As a lightweight compromise for this PR, perhaps we just include the Federated Pattern note at the top?

Note: For component-specific instructions, look for nested AGENTS.md files in subdirectories (e.g., sql/AGENTS.md, python/AGENTS.md). Agents read the nearest file in the directory tree, so the closest one takes precedence.

If we establish that routing rule now, it unlocks the ability for individual component maintainers to add their own hyper-specific architecture boundaries to their respective subdirectories later, without ever needing to bloat this root file or block on global consensus.

Thanks for driving this forward!

Co-authored-by: Isaac

cloud-fan · 2026-03-20T10:49:53Z

For component-specific instructions, look for nested AGENTS.md files in subdirectories

let's do it when there is at least one nested AGENTS.md exists.

cloud-fan commented Mar 19, 2026

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[MINOR] Address review comments: remove [MINOR] from PR title format,…

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… drop Python version check Co-authored-by: Isaac

cloud-fan added 2 commits March 19, 2026 13:52

[MINOR] Add instruction to ask user for JIRA ticket ID

30fa4ba

Co-authored-by: Isaac

[MINOR] Ask user to create/provide JIRA ticket, require approval befo…

2e4f1b0

…re push Co-authored-by: Isaac

cloud-fan changed the title ~~[MINOR] Improve AGENTS.md with inline build/test commands, PR workflow, and dev notes~~ [SPARK-56074][INFRA] Improve AGENTS.md with inline build/test commands, PR workflow, and dev notes Mar 19, 2026

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[MINOR] Simplify project overview in AGENTS.md

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Co-authored-by: Isaac

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[MINOR] Refine AGENTS.md: improve pre-flight checks, use <module> pla…

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…ceholders, simplify PR section Co-authored-by: Isaac

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[MINOR] Polish wording in Development Notes and PR Workflow sections

0047038

Co-authored-by: Isaac


		build/sbt -Phive package

		Set up and activate a virtual environment (Python 3.10+):


		### PR Title

		Format: `[SPARK-xxxx][COMPONENT] Title` or `[MINOR] Title` for trivial changes.


		## Before Making Changes

		Before the first edit in a session, check the git state:


		## Development Notes

		SQL golden file tests are managed by `SQLQueryTestSuite` and its variants. Read the class documentation before running or updating these tests.


		build/sbt -Phive package

		Activate the virtual environment specified by the user, or default to `~/.virtualenvs/pyspark`:

Conversation

cloud-fan commented Mar 19, 2026

What changes were proposed in this pull request?

Why are the changes needed?

Does this PR introduce any user-facing change?

How was this patch tested?

Was this patch authored or co-authored using generative AI tooling?

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