Install and state machine #68
Merged
Merged
Conversation
Closes the five structural gaps identified in the TDD analysis:
1. run_tests compound tool (src/tools/run_tests.js)
- Runs auto-detected test suite and returns structured output:
{ passed, failed, errors, skipped, failures[{name, message}], raw }
- Per-framework parsers for pytest, jest, vitest, go test, cargo test,
mocha, node:test — no more small-model output parsing
- test_filter arg maps to each framework's native pattern flag
(pytest -k, jest --testNamePattern, go -run, cargo positional, etc.)
2. TDD state machine (src/session/tdd_state.js)
- Tracks phase: idle → red → green → refactor → idle
- beginCycle(testName) / confirmRed / advanceToGreen / enterRefactor /
completeCycle — each with guard checks before transitioning
- checkToolCall(name, args) blocks impl writes before red is confirmed,
blocks test edits during green phase
- phasePrompt() injects current phase context into the system prompt
- Persists to .smallcode/tdd_state.json across session restarts
3. TDD governor (src/governor/tdd_governor.js)
- processTestResult(result) drives automatic phase transitions after
every run_tests call — confirmRed, advanceToGreen, completeCycle
- checkToolCall delegates to state machine for phase gates
- Singleton, reset between test runs
4. Tool wiring (bin/tools.js, bin/executor.js, src/api/index.js)
- run_tests, tdd_begin_cycle, tdd_status, tdd_advance, tdd_reset
added to COMPOUND_TOOLS and executor switch
- TDD gate checked before each tool execution in the agent loop
- Phase prompt injected into system prompt on every turn
5. Updated skills/tdd.md — references new tools and state machine;
documents phase gates and when each tool should be called
79 new tests across run_tests.test.js, tdd_state.test.js, tdd_governor.test.js
https://claude.ai/code/session_01S8ieQDoUu2nhnLNZYcLaR1
The TDD system now drives a full loop across a list of requirements,
not just a single cycle. The loop only exits when every requirement
has a passing test AND a clean full-suite regression run confirms no
regressions.
Changes:
TDDStateMachine (tdd_state.js):
- New loop mode: initRequirements(list) registers requirements as
pending, arms the loop, and resets any in-flight cycle
- Requirements tracked as {id, text, status: pending|active|done}
- After skipRefactor/completeCycle in loop mode, _finishCycle()
auto-advances: marks requirement done, activates the next one,
returns {loopAdvanced, nextRequirement} for the governor to relay
- allRequirementsDone() / loopComplete() / markRegressionClean()
for the two-condition completion gate
- phasePrompt() now renders a requirements checklist with ✓/→/○
markers showing loop progress
- Both modes (single-cycle and loop) persist to tdd_state.json
TDDGovernor (tdd_governor.js):
- processTestResult() handles the IDLE+loop case: after all
requirements are green, a clean full-suite run triggers
markRegressionClean() and emits "LOOP COMPLETE"
- Prompts for next requirement when idle between cycles
New tool:
- tdd_loop(requirements[]) — entry point; calls initRequirements,
resets governor singleton, returns requirements checklist + first action
Updated tools:
- tdd_status — shows full requirements checklist in loop mode
- tdd_advance — skip_refactor auto-advances loop to next requirement
97 tests pass (56 state, 13 governor, 28 run_tests)
https://claude.ai/code/session_01S8ieQDoUu2nhnLNZYcLaR1
The TDD loop now runs without the model knowing TDD protocol. The model only needs to write tests and implementation — the harness handles phase transitions automatically. Harness post-write hook (_tddPostWrite / executeToolWithTDD): - Wraps executeTool in bin/executor.js and _executeTool in src/api/index.js - Fires after every successful write_file / patch / append_file / read_and_patch when a TDD loop is active - Runs run_tests automatically (filtered to target test in RED/GREEN, full suite in REFACTOR or when all requirements are done) - Auto-begins cycle: if idle + test file written + failures detected, infers the test name from the first failure and calls beginCycle() - Calls governor.processTestResult() to drive phase transitions - Appends "[harness] run_tests: <summary>" to the tool response so the model sees the result without having called run_tests itself Tool surface visible to the model reduced from 5 TDD tools to 2: - tdd_loop(requirements[]) — entry point - tdd_status — read current progress tdd_begin_cycle, tdd_advance, tdd_reset remain executable via the harness internally but are no longer in the model-facing schema. skills/tdd.md reduced from 66 lines to 14: "call tdd_loop, write tests and implementation, harness handles the rest" 115 tests pass https://claude.ai/code/session_01S8ieQDoUu2nhnLNZYcLaR1
Add agentic TDD loop: run_tests tool, TDD state machine, and phase gates
Owner
|
Reviewed and merging — this is a strong contribution. A TDD harness (Red→Green→Refactor state machine + What I verified locally (the repo's Build/test workflow only runs on non-fork PRs, so CI here only shows Socket Security):
Two non-blocking follow-ups for a later PR (no need to hold this one):
Shipping in the next minor release (1.5.0). Thanks @scardoso-lu! |
Doorman11991
added a commit
that referenced
this pull request
May 30, 2026
chore(release): v1.5.0 — TDD harness (#68)
Owner
|
Thank you for your contribution! |
scardoso-lu
pushed a commit
to scardoso-lu/smallcode
that referenced
this pull request
May 30, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
No description provided.