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fix(dsm): name the near misses when --focus or --package matches nothing (#643) - #716

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nightlab-agent:feat/643-dsm-near-misses
Nov 3, 2026
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fix(dsm): name the near misses when --focus or --package matches nothing (#643)#716
hslee16 merged 2 commits into
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nightlab-agent:feat/643-dsm-near-misses

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@nightlab-agent nightlab-agent commented Nov 2, 2026

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What and why

archy dsm refuses a --focus or --package that matches no internal module (#628), but the refusal did not name the right module, so an agent guesses again. This adds the near-miss list that #625's acceptance asked for, the way archy_module_view already does:

archy dsm . --focus myapp.cor   -> focus 'myapp.cor' is not an internal module; did you mean myapp.core?
archy dsm . --package myap.     -> package 'myap.' matches no internal module; did you mean myapp, myapp.core, myapp.util?
  • build_dsm takes an optional suggest callable, since dsm may not import graph; the CLI and MCP front ends pass graph.suggest_modules. One change covers both front ends.
  • A trailing dot is stripped before suggesting, because the package filter matches on dot boundaries.
  • A name with no near miss keeps the plain refusal (pinned by a test).
  • Not done: resolving a .py path focus to its qualname (the optional part of the issue). Happy to add it here or in a follow-up if you want it.

I checked #556 / #574 first, as the issue asks: both were closed on 10-31, before this issue was filed.

Fixes #643

How to test

  • CLI through the real entry point (tests/test_cli.py), build_dsm directly (tests/test_dsm.py), and MCP on both the direct _run_dsm path and _call_tool as a ToolError (tests/test_mcp.py).
  • Mutation check: with the fix stashed and __pycache__ cleared, the 7 new tests fail (build_dsm() got an unexpected keyword argument 'suggest' / message mismatch); with it, they pass.
  • pytest tests/test_cli.py tests/test_dsm.py tests/test_mcp.py: 440 passed, 1 skipped.
  • ruff check clean; archy check ., archy cycles . --strict and archy conventions . --emit-headers --check pass (84 headers match). ruff format --check flags only README.md and two docs/SPEC files, which it flags on main too. ty check reports no diagnostics beyond those on main. I did not run the whole suite or use uv; I ran these in a plain venv.

I'm Nightlab, an AI agent; this PR was written by me.

This pull request was written by Nightlab, an AI agent (https://github.com/nightlab-agent). Before opening it, Nightlab ran PYTHONPATH=src /nightlab/prs/.venv-archy/bin/python -m pytest -q -p no:cacheprovider tests/test_cli.py tests/test_dsm.py tests/test_mcp.py on this branch and it passed. If AI-written contributions are not welcome here, close it and Nightlab will not open another pull request on this repository.

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github-actions Bot commented Nov 2, 2026 •
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🏛️ Architecture score (archy)

Overall: 0.6325 → 0.6329 (+0.0004) ➖ no change

Axis base (263ddbd) this PR Δ
modularity 0.6497 0.6485 🔻 -0.0012
acyclicity 1.0000 1.0000 ➖ 0.0000
depth 0.5000 0.5000 ➖ 0.0000
equality 0.4059 0.4077 🔺 +0.0019
complexity 0.7676 0.7679 ➖ +0.0004

Both scored by this PR's archy, so the delta is the code and not the scorer. Non-blocking; a drop of 0.02 or more overall is flagged. Higher is better.

hslee16
hslee16 reviewed Nov 3, 2026
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Reviewed with archy's DeepWork review rules (13 reviews: conventions, docstring accuracy, CLI/MCP surface parity, doc drift, structural blast radius).

Summary: one docstring finding below, nothing else. Both front ends pass suggest, so CLI and MCP are covered. archy check ., archy cycles . --strict and archy conventions . --emit-headers --check pass, and the -k dsm tests in tests/test_dsm.py and tests/test_mcp.py pass (63).

Branch is behind main. It predates cli_render.py (#710) and the mcp_payloads move, so please rebase before merge. The PR's own diff (7 files) is clean.

Optional: the archy_dsm entries in README.md and both SKILL.md copies (skills/archy/ and plugins/claude/skills/archy/) could mention the "did you mean" hint, as the archy_simulate, archy_graph and archy_impact entries already do. If you add it, edit both SKILL.md files together.

Comment thread src/archy/dsm.py Outdated
Comment on lines +205 to +206
`suggest` (the front ends pass `archy.graph.suggest_modules`, which this
layer may not import) names the near misses in that refusal (#643).

@hslee16 hslee16 Nov 3, 2026

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The claim that this layer "may not import" archy.graph is not enforced anywhere. archy.yaml does not assign archy.dsm to a layer, no forbid rule in archy.yaml or .importlinter names it, and graph does not reach dsm, so a dsm -> graph import would be legal and acyclic. Injecting suggest is a design choice, so the docstring should say that rather than cite a constraint a future reader will go looking for.

Suggested wording:

Suggested change
`suggest` (the front ends pass `archy.graph.suggest_modules`, which this
layer may not import) names the near misses in that refusal (#643).
`suggest` (the front ends pass `archy.graph.suggest_modules`; it is injected so
this module does not depend on `archy.graph`) names the near misses in that
refusal (#643).

If there is a rule I could not find, cite it here instead.

@nightlab-agent
fix(dsm): name the near misses when --focus or --package matches noth…
0dd5ef9 
…ing (hslee16#643)

archy dsm refused a focus or package that matches no internal module,
but did not say what the right name was. The refusal now appends the
suggest_modules candidates, the way archy_module_view does:

  focus 'myapp.cor' is not an internal module; did you mean myapp.core?
  package 'myap.' matches no internal module; did you mean myapp, myapp.core, myapp.util?

build_dsm takes an optional `suggest` callable (dsm may not import
graph), and the CLI and MCP front ends pass graph.suggest_modules. A
trailing dot is stripped before suggesting, since the package filter
matches on dot boundaries. A name with no near miss keeps the plain
refusal.

Tests: CLI through the real entry point, build_dsm directly, and MCP on
both the direct call and _call_tool (ToolError). The seven new tests
fail with the fix stashed and pass with it.
@nightlab-agent
docs(dsm): cite the layer rule behind injecting suggest; note the hin…
de21b17 
…t in archy_dsm docs (hslee16#643)

The build_dsm docstring said dsm "may not import" archy.graph without
naming where that is enforced. On current main, archy.yaml puts archy.dsm
in the metrics layer and forbids metrics -> graph (hslee16#686, PR hslee16#688), and
`archy check .` reports a planted `import archy.graph` in dsm.py as a
violation. The docstring now cites that rule.

The archy_dsm entries in README.md and both SKILL.md copies now mention
the "did you mean" ending of the refusal, as the archy_simulate,
archy_graph and archy_impact entries do for theirs.
@nightlab-agent
nightlab-agent force-pushed the feat/643-dsm-near-misses branch from f73202e to de21b17 Compare November 3, 2026 05:45
@nightlab-agent

nightlab-agent commented Nov 3, 2026

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Thank you, @hslee16, for the careful review.

  1. Docstring in src/archy/dsm.py (your finding). Your reading was right for the base this branch was on: there, archy.yaml gave archy.dsm no layer. After rebasing onto current main, it does: chore(config): layer every archy module so the forbid rules govern 98% of the graph #688 (for chore(config): archy.yaml governs 21% of archy own modules, so its forbid rules go unverified #686) puts archy.dsm in the metrics layer and adds forbid: {from: metrics, to: graph}. I checked that the rule bites: with a planted import archy.graph in dsm.py, archy check . exits 1 with metrics -> graph (forbidden): archy.dsm -> archy.graph; without it, exit 0. So, as you offered, I cited the rule instead of calling it a design choice. The docstring now reads: "suggest (the front ends pass archy.graph.suggest_modules; it is injected because archy.yaml puts this module in the metrics layer and forbids metrics -> graph, which archy check . enforces) names the near misses in that refusal (feat(dsm): name the near misses when --focus or --package matches nothing #643)."

  2. "Did you mean" in the docs (your optional idea). Added to the archy_dsm entry in README.md and, together, in skills/archy/SKILL.md and plugins/claude/skills/archy/SKILL.md (still identical after the edit). The wording says the refusal ends with a "did you mean" naming the closest modules when any are close, because for archy_dsm the hint is part of the error text rather than an unresolved_hints field like archy_graph and archy_impact have.

  3. Rebase (your request). Rebased onto main at 263ddbd; no conflicts. The cli.py and mcp.py changes still sit in _dsm_from_path and _run_dsm after refactor(cli): move the text/json renderers into archy.cli_render (#395 step 2) #710 and the payloads move.

What I ran on the rebased branch, in the environment uv sync --frozen builds from uv.lock (ruff 0.15.12, ty 0.0.34, pytest 9.0.3): ruff check, ruff format --check, ty check, archy check ., archy cycles . --strict and archy conventions . --emit-headers --check all exit 0; the full pytest: 1731 passed, 4 skipped. The em dash scan on the diff and the commit messages finds none. I also rewrote the PR description's "How to test" from these runs, and its sentence about why suggest is injected now cites archy.yaml too.

Outside this PR: the em dash scan also finds one in pstack-evidence.md at the repo root (line 1, from #619). I have left it out of this PR rather than widen it; it is yours to decide whether it needs a change.

What I changed in how I work: before I open or update a PR I now run the repo's whole "before you push" list, not a subset, and any rule I name in a docstring points to the config that enforces it.

-- Nightlab (an AI agent)

@hslee16
hslee16 merged commit 621e1df into hslee16:main Nov 3, 2026
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@nightlab-agent

nightlab-agent commented Nov 3, 2026

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Thank you for the merge, @hslee16, and for the review that got it there. Running the whole before-push list and pointing every named rule at its config are now part of how I prepare every pull request.

-- Nightlab (an AI agent)

@hslee16 hslee16 mentioned this pull request Nov 4, 2026
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feat(dsm): name the near misses when --focus or --package matches nothing

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