docs: retro for the WebServer stall work (ADFA-5172/5175/5176) - #1691
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Nine actions from the session, all executed. CLAUDE.md gains the lesson that cost the most: before designing a way to tune a mechanism, ask whether the mechanism can go. Keep-alive was filed and started before anyone asked whether documentation needed a socket at all, and the evidence -- drop rate scaling with connection rate -- had been pointing at "open fewer connections" the whole time. It also states the convention that kept three whole-file Spotless reformats out of the diffs that mattered. learnings.md gains what the session found the hard way: config defaults that call framework APIs make themselves unconstructable in a JVM test; how to test WebView interception without Robolectric; how in-process serving behaves (matches any URL, no response decoding, no POST body, no 206, and a WebView cannot render a PDF at all); and that Android's system SQLite may have no JSON1, which is what breaks the bookshelf on real hardware while passing every desktop test. The retro script counted the agent's own screenshot reads as user turns. Filtering them moved hands-on from 51 to 53 minutes rather than down: the phantom buffers go away, but their assistant output is re-attributed to the real prompts. Two pre-existing bugs found while verifying on device are now filed as ADFA-5179 (bookshelf 500 without JSON1) and ADFA-5180 (PDFs blank in HelpActivity).
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WalkthroughThe change filters image tool results from transcript timing calculations, refines project and Android guidance, and updates retrospective time-span metrics and formatting. ChangesRetro analysis and guidance
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This PR updates retrospective documentation, project guidance, learnings, and transcript analysis without a demonstrated product or production-impacting defect; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Poem
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Actionable comments posted: 5
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Inline comments:
In `@CLAUDE.md`:
- Line 43: Update the guidance sentence in the documented principle to
explicitly ask whether the mechanism itself, or the work it creates, can be
removed; replace the ambiguous “the mechanism can go” and “stop generating them”
wording while preserving the existing examples and intent.
In `@docs/process/learnings.md`:
- Line 11: Revise the documentation statement about JVM unit tests so it applies
only when framework APIs are not mocked or otherwise provided. State that such
tests must explicitly supply every framework-backed parameter, while preserving
the guidance to prefer lazily resolved paths.
- Around line 15-18: Update the WebView documentation around
shouldInterceptRequest and WebResourceResponse to state that interception
excludes blob:, javascript:, and asset URLs rather than claiming every URL is
intercepted; retain the POST-body limitation, but describe range handling as a
limitation of the current handler despite WebResourceResponse supporting status
206 and response headers. Replace the blanket PDF statement with the narrower
behavior that this WebView path does not natively render PDFs and requires a
separate renderer such as PdfRenderer, keeping the text aligned with the
implementation.
In `@docs/process/retrospective.md`:
- Around line 8-15: Reconcile the retrospective’s Time Breakdown totals with the
Metrics table and the listed phase timestamps, including the 20-minute Retro
phase. Update the reported values to match the rows, or explicitly document
which phases and idle intervals are excluded so the totals are internally
consistent.
- Around line 5-6: Update the Markdown in the retrospective document by adding
blank lines before each table and after the Actions Taken table, resolving MD058
at the referenced table sections. Run the repository formatting task before
completing the change.
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jatezzz
approved these changes
Aug 19, 2026
Review found five things in the retro PR, two of them corrections to claims I wrote, which matters more than usual in a document meant to be trusted later. The two timing tables disagreed: per-phase rows summed to 481 minutes of agent time against a 380-minute total, because the rows were prompt-to-prompt spans -- agent work *plus* however long nobody was at the keyboard -- while the total was an estimate of just the agent's share. The column now says span, the spans are exact from the message timestamps and sum to the wall clock, and Metrics states plainly which of its numbers are measured and which are estimated. The WebView claims in learnings.md were too strong in three ways. shouldInterceptRequest sees the page's http(s) requests, not every URL -- blob:, javascript: and android_asset requests never reach it. WebResourceResponse can express 206 and headers through its six-argument constructor, so the missing range support is our handler's, not the API's. And a WebView not rendering a PDF is a matter of it having no renderer, with PdfRenderer as the way to fix it (see ADFA-5180), rather than a flat impossibility. The JVM-test note now says what it should: framework-backed defaults break a test that doesn't stub those APIs, and mockkStatic or Robolectric are alternatives to passing every parameter. CLAUDE.md's new bullet drops "the mechanism can go" for wording that says what to look for -- eliminating the operations rather than optimizing each one -- since "stop generating them" reads oddly for something like bytes per call. MD058 is fixed for the whole file, including the three pre-existing entries, so markdownlint is clean rather than clean-except-the-old-parts.
hal-eisen-adfa
marked this pull request as draft
August 21, 2026 18:10
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Retro for the session behind #1688 (ADFA-5172), #1689 (ADFA-5175) and the in-progress ADFA-5176 work. Nine actions, all executed here.
The lesson worth the CLAUDE.md line
Keep-alive was designed, filed as a ticket, and started before anyone asked whether documentation needed a socket at all — and the evidence had been pointing the other way the whole time: the drop rate scaled with the connection rate, which says "open fewer connections", not "make each one cheaper".
WebViewClient.shouldInterceptRequestremoves the socket entirely. That question came from the user, a day into the work; it should have come first.So CLAUDE.md's "Plan and size before building" now says: when the evidence for a problem scales with a rate or a volume, check whether the platform can remove the mechanism before planning the tuned version.
The second CLAUDE.md line states a convention this session used three times by hand: when the Spotless ratchet pulls a whole file in, land that reformat as its own commit, ahead of the behavioral one, so a 160-line whitespace diff doesn't bury a 10-line change.
learnings.md
Four additions, all found the hard way:
ServerConfig's paths default throughEnvironment.getExternalStorageDirectory()) is unconstructable in a JVM test — the constructor throws before the test body runs.mockkStatic(android.os.Environment::class)plus a mockedUri, and keep theWebResourceResponseconstruction out of the unit under test.http://localhost:PORT/...space needs no rewriting; a WebView doesn't decode an intercepted response;shouldInterceptRequestnever sees a POST body and can't answer a 206; and a WebView cannot render a PDF at all.JSON_OBJECTfails at runtime on a Samsung Android 13 device while the same query runs fine against the same file on a desktop.Retro script fix
analyze_transcript.pycounted the agent's own screenshot reads as user turns. Filtering them moved hands-on from 51 to 53 minutes rather than down as predicted: the phantom buffers disappear, but their assistant output is re-attributed to the real prompts.Tickets filed
HelpActivity. Identical on both transports, so pre-existing.Session shape, for the record
10h 21m wall-clock, 53 minutes hands-on (9%), 13 user messages, most of them one to three words, zero substantive corrections. The two longest unattended stretches — 30m to root-cause the stall, 130m for the cross-module extraction — produced the most.
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