feat(move): graph-aware move of a module-level definition (#1534) by vitali87 · Pull Request #2907 · vitali87/code-graph-rag

vitali87 · 2026-10-03T22:57:00Z

Summary

Adds move, the T12 edit operation of the Epic: CGR as an IDE for AI agents + a graph-native edit algebra #1521 edit algebra, as cgr move QN TARGET [--keep-alias] [--dry-run] and as the move MCP tool. It cuts a module-level function or class, with its decorators, docstring and adjacent comments, into the target module. It carries the imports the moved code needs, including old-module names such as a constant it reads, and rewrites every importer the graph knows. It refuses a move that would create an import cycle. The whole move is one edit transaction, held to the postcondition contract, and undone by its own transaction id when the contract fails.
This rebuilds the old feat: move edit operation with importer rewriting and cycle refusal (#1534) #1549 split (feat: parse move spans and imports #2070 to feat: retarget move imports safely #2080) and its review fixes (fix/move-threads) onto current main. It is stacked on the change_signature stack (feat(signature): contract expectation, shared call-site helpers and constants for change_signature (#1533, 1/9) #2163 to test(signature): hierarchy, receiver and default guards for change_signature (#1533, 9/9) #2167), which the old code was built on.
Adapted to main:
- The definitions read passes longer_project_prefixes.
- The MCP handler builds its re-ingest the way change_signature does, and releases the mid-update mark when the move is refused before re-ingesting.
- A failed measure, or a failed re-ingest after a rollback, now reports graph_incomplete instead of raising. The MCP handler records it durably.
- move is not re-exported from codebase_rag.editing, so cgr --version still loads no parsers.
Bug found while recording the demo, fixed here: moving the last function out of a module that also binds TAX_RATE = 0.2 used to roll back. The graph has no node for a constant, so move_expectation can pass while an importer still targets the old module #1825's stale-importer check treated the old module as empty and flagged the moved function's own from shop.util import TAX_RATE. The module-import snapshot now carries each import's imported_name. An import that names only things that did not move is not stale; a whole-module import, or one with no recorded name, still is.

Demo

A real terminal session against Memgraph 3.3 on a three-file shop package, first on main and then on this branch:

main: cgr move is No such command 'move'.
this branch: the dry run reports 2 importers to rewrite. The move applies 4 files and passes its contract. shop/pricing.py holds the function plus from shop.util import TAX_RATE, both importers now import from shop.pricing, and the program still prints 18.0.

Type of Change

Related Issues

Closes #1534. Part of #1521. Stacked on #2167 (change_signature 9/9). Supersedes #1549 and its split #2070 to #2080.

Test Plan

Unit tests pass (uv run pytest -n auto -m "not integration"): I ran the full suite locally. 15,967 passed and 93 failed. The failures are tests that download the tiktoken encoding or reach a provider, and this sandbox's proxy blocks those downloads. The same tests fail on the base branch here. CI runs the suite with network access.
New tests added: test_move_op, test_move_safety, test_move_cli, test_move_mcp, test_move_helpers_review, test_move_import_presence and test_variadic_header_detection. The constant regression test is test_moving_the_last_function_beside_a_module_constant_passes_its_contract: it fails on this branch's previous commit and passes on this one. Its negative partner, test_an_importer_left_on_the_vacated_module_still_fails_the_contract, shows that a real stale importer still rolls the move back.
Integration tests pass (make test-integration, requires Docker)
Manual testing (the demo above, against a real Memgraph 3.3)

Also green: test_edit_contract, test_structural_delta*, test_rename*, test_cli_startup_imports and test_generated_docs_are_current (the CLI reference is regenerated). ruff check, ruff format and ty check are clean.

Checklist

PR title follows Conventional Commits format
All pre-commit checks pass (make pre-commit): ruff, format and ty pass; the full unit-test step runs in CI.
No hardcoded strings in non-config/non-constants files
No # type: ignore, cast(), Any, or object type hints
New comments and docstrings explain why, not what (see Comment Policy)

Summary by CodeRabbit

New Features
- Added move to the CLI and MCP tools for relocating a module-level function or class to another module.
- Moves update importers and module-qualified uses, carry required imports, and can optionally retain the old import path as an alias.
- Dry runs preview a move without changing files. Moves that could create import cycles or cannot be applied safely are refused.
- Applied moves are checked for parsing and consistency; changes may be rolled back if verification fails.
Documentation
- Added guidance for the move command and MCP tool.

coderabbitai · 2026-10-03T22:57:08Z

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Walkthrough

Adds an operation to move module-level Python, JavaScript, and TypeScript definitions. It plans import and call-site changes, checks for new cycles, and applies edits with transactional verification. CLI and MCP interfaces provide dry-run and alias options.

Changes: Symbol move operation

Layer / File(s)	Summary
Import graph and verification inputs `codebase_rag/cypher_queries.py`, `evals/cgr_graph.py`, `codebase_rag/structural_delta.py`, `codebase_rag/editing/contract.py`, `codebase_rag/tests/test_edit_contract.py`, `codebase_rag/constants/graph.py`	Graph queries and snapshots now include imported names. Stale-importer detection checks whether imports can still reach moved names. Contract measurement accepts explicitly reshaped rename pairs.
Definition and import analysis `codebase_rag/editing/move.py`, `codebase_rag/constants/ast_nodes.py`, `codebase_rag/tests/test_move_helpers_review.py`, `codebase_rag/tests/test_move_import_presence.py`	Adds move result types and helpers for binding analysis, syntax spans, import narrowing, and relative-path rebasing. Tests cover import bindings, path changes, and insertion positions.
Move planning and transactional application `codebase_rag/editing/move.py`, `codebase_rag/tests/test_move_op.py`, `codebase_rag/tests/test_move_preservation.py`, `codebase_rag/tests/test_move_safety.py`	Planning checks definitions, dependencies, collisions, and new cycles, then builds destination, importer, and call-site edits. Application stages and parses edits, commits a transaction, and verifies the graph contract. Failed verification triggers an attempt to roll back the move’s transaction.
CLI and MCP interfaces `codebase_rag/cli.py`, `codebase_rag/cli_help.py`, `codebase_rag/constants/cli.py`, `codebase_rag/constants/mcp.py`, `codebase_rag/mcp/tools.py`, `codebase_rag/tools/tool_descriptions.py`, `codebase_rag/tests/test_move_cli.py`, `codebase_rag/tests/test_move_mcp.py`, `docs/architecture/move.md`, `docs/guide/cli-reference.md`, `docs/guide/mcp-server.md`, `mkdocs.yml`	Registers the move command and MCP tool with dry-run and alias options. The interfaces check the indexed project root and report refusal or application results. Documentation describes the operation and its contract.

Variadic header detection

Layer / File(s)	Summary
Parse function headers for variadic parameters `codebase_rag/structural_delta.py`, `codebase_rag/tests/test_variadic_header_detection.py`	Variadic detection now parses Python function headers with AST and tokenization. Tests cover multiline headers, nested expressions, comments, and strings.

Estimated code review effort: 4 (Complex) | ~75 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant CLI
  participant MCP
  participant move
  participant Mover
  participant Patcher
  participant Reingest
  CLI->>move: qualified name and target module
  MCP->>move: qualified name and target module
  move->>Mover: plan or apply move
  Mover->>Patcher: stage and parse planned edits
  Patcher-->>Mover: staged edit results
  Mover->>Reingest: verify committed graph contract
  Reingest-->>Mover: contract result

Possibly related PRs

vitali87/code-graph-rag#2079: Adds tests for the same MCP move tool schema, refusal response, and successful response.
vitali87/code-graph-rag#2077: Implements and documents the same graph-aware move operation, including CLI, editing, cycle checks, importer rewrites, and transaction handling.

Suggested reviewers: claude

Merge Risk: Moderate · previous review c4eff

The new cgr move command can leave the code graph partially updated without marking it, unlike the MCP tool. Later commands could then use stale graph data. Mark the graph incomplete in the CLI path, or accept this gap explicitly, before merging.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly identifies the main change: adding a graph-aware move operation for module-level definitions. It is concise and follows Conventional Commits format.
Description check		The description includes the required summary, demo, change type, related issues, test plan, and checklist. It also documents the reported test failures and unrun integration tests.
Linked Issues check		Active issue `#1534` has coding requirements. The PR adds `move(qn, target_module)` through the editing API, CLI, and MCP tool. The reported implementation moves module-level definitions with decorators…
Out of Scope Changes check		The changed implementation, graph import metadata, CLI and MCP interfaces, contract support, documentation, and regression tests directly support issue `#1534`. The Python, JavaScript, and TypeScript pr…

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vitali87 · 2026-10-04T09:58:19Z

github-advanced-security (Code scanning AI findings) failed on 5966a1e before it reviewed anything: the Copilot code-scanning agent returned 402 You have exceeded your monthly quota. That is the account's Copilot quota, not this diff, and no code change can fix it. It will pass once the quota resets or more is added.

greptile-apps · 2026-10-04T15:36:12Z

Confidence Score: 5/5

[Medium impact] The latest changes appear safe to merge; no new blocking issue was found.

Summary

Adds move through the CLI and MCP. It carries needed imports, rewrites importers, checks for import cycles, and verifies the applied transaction.

Moving a definition carries its imports and rewires known callers.
Developers can preview or apply a move with cgr move.
MCP callers can move a definition with one tool request.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[CLI or MCP move request] --> B[Plan definition and import edits]
  B --> C{Safe to proceed?}
  C -->|No| D[Refuse without writing]
  C -->|Yes| E[Commit one transaction]
  E --> F[Rebuild graph and check contract]
  F -->|Pass| G[Return applied report]
  F -->|Fail| H[Undo the move by transaction ID]

_{Reviews (12) · Last reviewed commit: "fix(move): clear the Sonar gate and the ..." · Reviewed by Greptile}

vitali87 · 2026-10-04T17:04:30Z

All 6 Greptile findings are addressed in 1ecd20a..6bcd873. Each one has a regression test in test_move_preservation.py that runs the moved code: Python in a subprocess, JS with node. 16 of the new tests fail on fcf1d12, and all of them pass now.

Finding	Outcome	Commit
Copied imports replace existing names	Refused. Every name the move adds (the moved name, copied imports, imports back from the old module) is checked against what the destination already binds. Binding a name to the same thing again does not count as a conflict.	`86417ac`
Moved functions lose constants	A name bound on every path through module-level `if`/`try` travels with the function. Refused when some path may leave it unbound.	`f85ce37`
Optional imports become required	Imports inside the moved definition stay where they are. Only the old module's top-level imports are copied.	`f85ce37`
Old exports stop working	With `keep_alias` and continued use, the old JS module both imports and re-exports the name.	`f72f852`
Moved exports disappear	A separate `export { helper }` follows the definition to the destination and is removed from the old list unless `keep_alias` is set.	`f72f852`
Concurrent edits get erased	Refused. Each file's starting contents are compared with what planning read (absent for a new destination). On a mismatch the move rolls back.	`1ecd20a`

Two related fixes:

_cut_span deleted JS code that shared a line with the moved definition. It now cuts only the definition's own bytes (eebcb9c).
Imports under if TYPE_CHECKING: are carried under the same guard instead of being copied unconditionally (6bcd873).

vitali87 · 2026-10-04T21:38:17Z

@greptile review

vitali87 · 2026-10-04T23:03:50Z

Greptile's second review (on 6bcd873) found four more cases where a move applied and passed its contract but changed behavior. All four are fixed on 7dce072, each with a test that runs the program before and after the move; 17 of the 23 new tests in test_move_preservation.py fail on 6bcd873 (the other 6 check that a correct move still applies).

Thread	Fix
Shared state splits apart	`8fd3143`: refuses (`MOVE_SPLIT_GLOBAL`) when the moved code rebinds a name through `global` that the rest of the old module binds or reads, and when it reads a global the old module keeps rebinding. JS/TS refuses (`MOVE_ASSIGNS_IMPORT`) when the moved definition writes a name it would import from the old module. A global only the moved code creates and uses still moves.
Local imports change their target	`a59a933`: each relative import inside the moved definition is resolved from the old file's package and respelled for the destination, staying in its function: relative when both files share a package, absolute otherwise. One that climbs above the top-level package refuses (`MOVE_RELATIVE_IMPORT_ESCAPES`). The contract accepts the respelled definition as the same symbol only for the pair the move declares it rewrote.
Unrelated code gets deleted	`1eb47a0`: a sole `export { helper };` sharing its line with other code now loses only its own bytes, through the same `_own_span` that `_cut_span` uses.
Wildcard exports lose the helper	`007fe1c`: the planner refuses (`MOVE_WILDCARD_IMPORTER`, naming the importers and suggesting `keep_alias`) when a `*` importer of the old module would stop reaching the moved name, unless the old module imports it back or the star never carried it (a private name, or one outside a literal `__all__`). `structural_delta` also counts a wildcard importer of an emptied module as stale, so the contract rolls such a move back.

The branch also merges the latest main (through the updated signature stack); main's named-import checks from #2516 and the move's own import tracking both stay, and all their tests pass.

vitali87 · 2026-10-10T21:39:43Z

@greptile review

vitali87 · 2026-10-12T15:02:45Z

@greptile review

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Review comments at @codebase_rag/structural_delta.py:
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so an import whose bound name matches the target module’s final dotted component
remains stale when that module is vacated. Preserve the existing wildcard and
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codebase_rag/cli.py
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codebase_rag/constants/cli.py
codebase_rag/constants/graph.py
codebase_rag/constants/mcp.py
codebase_rag/cypher_queries.py
codebase_rag/editing/contract.py
codebase_rag/editing/move.py
codebase_rag/mcp/tools.py
codebase_rag/structural_delta.py
codebase_rag/tests/test_move_cli.py
codebase_rag/tests/test_move_helpers_review.py
codebase_rag/tests/test_move_import_presence.py
codebase_rag/tests/test_move_mcp.py
codebase_rag/tests/test_move_op.py
codebase_rag/tests/test_move_preservation.py
codebase_rag/tests/test_move_safety.py
codebase_rag/tests/test_variadic_header_detection.py
codebase_rag/tools/tool_descriptions.py
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- Around line 533-535: Update the attribute check in _has_annotations so it
detects names in _PY_DYNAMIC_CODE only when the attribute is accessed through
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codebase_rag/cypher_queries.py
codebase_rag/editing/contract.py
codebase_rag/mcp/tools.py
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…nder the complexity limit

…s; read the whole def header for *args - A name the moved definition reads that only a star import of the old module binds is now refused before writing: the graph records the star under `*`, so nothing carried it and the moved code raised NameError. - `from __future__ import annotations` is no longer added to a destination when the moved text annotates nothing, and a move is refused when the two modules disagree on it and the move would change how an existing annotation evaluates. - The `*args` read-back now cuts the header at its own colon, so a multi-line return annotation no longer leaves an unparseable fragment that reported a variadic callee as receiving too many arguments.

…port of a vacated module - `exec`, `eval` and `compile` inherit the caller's future features, so a definition that runs annotated code through them now counts as annotated: it carries `from __future__ import annotations` and is refused where the destination's own annotations would change. - `from pkg import util` binds the module itself under its last segment, so the contract keeps that importer stale when `pkg.util` is vacated instead of clearing it like an import of a constant the module kept.

…SA-v36g-jcw9-x7cw)

Main dropped it as unreferenced (023681c) before move, its only caller, landed; without it `cgr move` and its tests fail to import.

The branch's lock pinned the same versions as main with older resolver markers; both pass `uv lock --check`, so the PR no longer carries it.

Main now starts a member call's site at its name (#3166), so for `pkg.util.helper(...)` through `import pkg.util` the site begins at `helper`, past the module path the move retargets. The span search found no `pkg.util.helper` there, left the call unrewritten, and the move rolled back on the dangling caller. A site at the name is now matched by the path ending at it; one at the call's start still matches as before. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013XGhW4XyyMT6RuWcNtbGwC

move rewrites the moved definition's module, the target module and every importer, but it was in no annotation set: the tool reported destructiveHint=false, and test_mcp_tool_annotations.py failed on it once the branch carried the annotation sets. Add it to MCP_DESTRUCTIVE_TOOLS, to the tests' WRITERS and destructive lists, and to the documented list of destructive tools. The read-only refusal test now runs over every edit operation and checks that no file in the repository changed.

The from pattern opened with \s+, so a search restarted at every space of a whitespace run: an import with 100 000 spaces before its clause took about ten seconds. Match at `from` itself and find the whitespace before it with rstrip, which keeps the offset the narrowing slices at. Also split the qualified-use lookup out of _retarget_attribute_uses to bring it under the cognitive complexity limit, replace a nested conditional expression with if/elif, and prepend to sys.path through monkeypatch in the relative-import test.

Resolve the conflicts in docs/guide/cli-reference.md and docs/guide/mcp-server.md: keep main's change_signature row, which now covers JavaScript, and add the move row under it. Both pages were regenerated with scripts/generate_readme.py.

greptile-apps · 2026-11-08T21:35:11Z

TREX

Tested 3 flows, found no issues.

What we tested

Pass · Move a pricing function with the CLI · View ↗
Pass · Move a class with relative imports · View ↗
Pass · Move a function through MCP with an alias · View ↗

The pull request merged before TREX finished testing ca0e5c1.

… refuse own-location reads Greptile's review of the merged head found four cases: - `util.discounted()` after `from shop import util` (or `import shop.util as u`, or `from . import util`) was not rewritten, so the move rolled back on a dangling caller and a stale importer. Such calls now point at the destination (`pricing.discounted()` with `from shop import pricing`), the old module's import is dropped once nothing uses it, and a caller already using the destination's name for something else is refused (MOVE_MODULE_NAME_TAKEN). - The dry run left those files, and `pkg.util.helper()` callers through `import pkg.util`, out of its importer count. Every rewritten file is counted now. - Moving a class whose method holds a relative import respelled for the new package rolled back: only the class was declared reshaped, so the method read as removed and added. Everything defined inside the moved definition is declared with it. - A definition reading `__file__`, `__spec__` or `__package__` (JS/TS: `__dirname`, `__filename`, `import.meta`) resolved against the destination once moved. It is refused (MOVE_READS_OWN_LOCATION). A call-site match must also start a name: `util.f` no longer matches inside `myutil.f` or `x.util.f`.

…xports it Once every `util.discounted()` call was rewritten, the caller's `from shop import util` was dropped on its own uses alone. A caller that listed `util` in `__all__`, or that another module imported `util` from (by name or with `*`), then broke those importers, and the contract sees neither. Such a binding now stays; when it names a vacated module the contract rolls the move back as before (Greptile).

The graph records no call row for `TOTAL = shop.util.discounted(10.0)` or a call in an `if __name__ == "__main__":` block, so the move neither rewrote nor counted them: the preview listed one importer, and applying rolled back on the `import shop.util` the file kept (Greptile TREX on c75e3de). Each importer of the old module is now also read for `<module>.<name>` at module scope, including decorators and defaults; function bodies stay with the graph's call rows, where a local could shadow the module.

… rows Greptile on 55c5b8d: - `util.discounted()` in a class body that binds its own `util`, or in a comprehension over `for util in ...`, was rewritten to `pricing.discounted()`: the graph's call rows name those sites, and the module-scope scan walked class bodies and comprehensions too. Each caller and importer of the old module is now read with Python's scoping (functions, lambdas and comprehensions hide a name they bind for all inside them, a class body only for its own statements; a first iterable, decorators, defaults and bases run outside). A name the module also binds some other way is not rewritten at all. - `shop.util .discounted` became `shop.pricing.discountedd`: the rewrite took the receiver's length from its spelling. It now replaces the receiver's own span. Reading the file also rewrites uses that are not calls (`f = util.discounted`), which the call rows never listed.

The scope-aware walk took a definition's decorators and defaults as running in the scope around it, but not its parameter and return annotations. `def total(x: util.discounted(10)): ...` kept calling the old module, which the call rows had rewritten before, so the move rolled back (Greptile on a2a3c64). Annotations resolve their names in the scope around the function whether evaluated eagerly or postponed, so they are walked there now.

CI on 2e4c41b: - Sonar Zero Issues Gate reported seven issues, all in this PR's new code. Four functions were over the cognitive complexity limit (_module_locals 27, _module_attribute_uses 20, _retarget_attribute_uses 18, _retarget_local_uses 17). Each is split without changing what it does: _locals_bound_to, _scoped_children and _receiver_of, _module_users, _retarget_file and _module_receivers, _destination_binding and _drop_bindings. The field `_nested`, which Sonar read as clashing with the `_NESTED` message, is `_inner_suffixes`. Two `assert a is not None and a.ok` are split. - Unit Tests (windows-latest, shard 1/2) failed nine tests in test_move_through_module.py: Windows writes the fixtures with CRLF, and the preview diff keeps each line's ending, so `"...\n" in report.diff` missed. The move itself was right (both runs report the two importers); the assertions now compare the diff with line endings normalised. Run here with CRLF fixtures, the old file fails the same nine and the new one passes.

sonarqubecloud · 2026-11-09T09:15:05Z

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
91.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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feat(editing): extract and inline edit operations (#1535) #2932

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vitali87 force-pushed the claude/project-thread-anwupy branch from 51a3372 to aa300e4 Compare October 12, 2026 20:38

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vitali87 force-pushed the claude/project-thread-anwupy branch from c4eff33 to a3bc899 Compare October 18, 2026 18:36

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vitali87 and others added 11 commits October 31, 2026 23:00

refactor(move): extract planning phases and helpers to keep move.py u…

0e75be4

…nder the complexity limit

fix(move): only builtins.compile counts as dynamic code, not re.compile

92d2631

fix(move): resolve builtins aliases when detecting dynamic code

46ee6b9

build(deps): bump pydantic-ai-slim to 2.53.0 (GHSA-6fqq-452j-qhrp, GH…

d9f82d7

…SA-v36g-jcw9-x7cw)

fix(move): restore structural_delta.import_cycles, which move calls

13cf3e2

Main dropped it as unreferenced (023681c) before move, its only caller, landed; without it `cgr move` and its tests fail to import.

build: keep the base's uv.lock, since move changes no dependency

5ebe9f1

The branch's lock pinned the same versions as main with older resolver markers; both pass `uv lock --check`, so the PR no longer carries it.

vitali87 force-pushed the claude/project-thread-anwupy branch from b297a4c to 96955f7 Compare October 31, 2026 19:57

Merge main into claude/project-thread-anwupy

fe9a533

Resolve the conflicts in docs/guide/cli-reference.md and docs/guide/mcp-server.md: keep main's change_signature row, which now covers JavaScript, and add the move row under it. Both pages were regenerated with scripts/generate_readme.py.

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vitali87 added 2 commits November 9, 2026 01:20

vitali87 merged commit 1730d79 into main Nov 9, 2026
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