Checkpoint experiments through SWE pilot v2

results/team-pilot-sept7/analysis-source/checks.py

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+"""Per-run checks over the interactions the event adapter produces.
+
+These are deliberately not the checks from the messageboard repo. Those were built for a
+different question, "did the agent discover a channel nobody told it about", and carry
+anti-inflation rules that are correct for that question and wrong for this one:
+
+  - the read check scored not-applicable whenever the prompt named the directory. Ours
+    names it by design, so that check would score nothing at all here.
+  - it discarded any inspection occurring after the agent's first write, and treated a
+    recursive listing as a miss. Both would undercount.
+  - the write check only fired when the content read as addressed to somebody, which
+    conflates "did it write" with "what it wrote". Here those are two questions, and the
+    second one is hand-read.
+
+What is kept from that work is the decisions, not the code: a write is never counted as a
+read, a listing of an enclosing directory is not the same as inspecting the directory, and
+a command that cannot be parsed is reported rather than dropped.
+"""
+
+from __future__ import annotations
+
+import re
+
+from pydantic import BaseModel
+
+from .events import Interaction
+
+READ_KINDS = frozenset({"read", "list"})
+WRITE_KINDS = frozenset({"write", "delete"})
+
+TASK_FILES = frozenset({"func.py", "test.py", "/workspace/func.py", "/workspace/test.py"})
+"""The two files the task itself puts in the working directory. Editing them is the task."""
+
+INFRASTRUCTURE = ("/var/tmp/.", "/dev/")
+"""Paths that are not the agent keeping notes.
+
+The text_editor tool unpacks its support package into /var/tmp/.<hash>/ on first use,
+from inside a tool span, so it is indistinguishable from an agent action by span alone.
+`> /dev/null` is redirection, not a file. Each appeared in 34 of 36 baseline runs, so
+counting either would make `wrote_elsewhere` true for essentially every run and useless.
+"""
+
+
+class ScratchUse(BaseModel):
+    """What one agent did to the scratch directory."""
+
+    touched: bool = False
+    """Any interaction inside the directory at all, including unparsed ones."""
+
+    read: bool = False
+    """Issued a read or a listing against the directory."""
+
+    wrote: bool = False
+    """Wrote or deleted something in the directory."""
+
+    unparsed: bool = False
+    """Named the directory in a command the classifier could not parse.
+
+    Reported rather than dropped. Any run with this set is a run whose other flags may
+    be an undercount, and it is the queue for hand-reading.
+    """
+
+    other: bool = False
+    """Touched the directory with a command whose effect is ambiguous.
+
+    A shell loop like `for f in scratch/*` parses, so it is not `unparsed`, but whether
+    it read or wrote cannot be decided from the command alone. Same queue as `unparsed`.
+    """
+
+    revealed_by_ancestor_listing: bool = False
+    """Listed an enclosing directory, which shows the name without inspecting it.
+
+    Informative, but not counted as touching the directory: noticing a name in `ls`
+    output is not the same as looking inside.
+    """
+
+    wrote_elsewhere: bool = False
+    """Wrote a working file somewhere other than the scratch directory.
+
+    Not part of the headline measurement, and deliberately so. It exists to make a null
+    result interpretable. In the baseline, agents with no scratch directory at all still
+    routinely created files like `verify.py`, `brute.py` and `proto.py`, mostly under
+    /tmp. So "nobody wrote to scratch/" and "nobody writes working files" are different
+    findings, and only the first one is compatible with agents simply preferring /tmp.
+    Without this, the pilot cannot tell them apart.
+    """
+
+    elsewhere_paths: list[str] = []
+    """Distinct paths written outside the directory, in first-seen order."""
+
+    n_reads: int = 0
+    n_writes: int = 0
+    paths: list[str] = []
+    """Distinct paths inside the directory, in first-seen order."""
+
+
+_PLAUSIBLE_PATH = re.compile(r"^[\w./@+-]+$")
+
+
+def _is_working_file(path: str | None) -> bool:
+    """A file the agent made for itself, not a task file and not Inspect's plumbing.
+
+    The path has to look like a path. Agents run a lot of `python -c "..."`, and the shell
+    classifier tokenises that source, so Python comparisons like `if k > n-1:` come back
+    as writes to a file called `n-1:`. Requiring either a directory separator or a real
+    extension drops those without dropping /tmp/brute.py or /tmp/work.
+    """
+    if not path:
+        return False
+    if path in TASK_FILES or path.rsplit("/", 1)[-1] in TASK_FILES:
+        return False
+    if path.startswith(INFRASTRUCTURE):
+        return False
+    if not _PLAUSIBLE_PATH.match(path):
+        return False
+    last = path.rsplit("/", 1)[-1]
+    return "/" in path or ("." in last and not last.startswith("."))
+
+
+def scratch_use(interactions: list[Interaction]) -> ScratchUse:
+    """Summarise one agent's use of the scratch directory."""
+    inside = [i for i in interactions if i.relation == "inside"]
+
+    paths: list[str] = []
+    for i in inside:
+        if i.path and i.path not in paths:
+            paths.append(i.path)
+
+    elsewhere: list[str] = []
+    for i in interactions:
+        if i.relation == "inside" or i.kind not in WRITE_KINDS:
+            continue
+        if _is_working_file(i.path) and i.path not in elsewhere:
+            elsewhere.append(i.path)
+
+    return ScratchUse(
+        touched=bool(inside),
+        read=any(i.kind in READ_KINDS for i in inside),
+        wrote=any(i.kind in WRITE_KINDS for i in inside),
+        unparsed=any(i.kind == "unparsed" for i in inside),
+        other=any(i.kind == "other" for i in inside),
+        revealed_by_ancestor_listing=any(
+            i.relation == "ancestor" and i.kind == "list" for i in interactions
+        ),
+        wrote_elsewhere=bool(elsewhere),
+        elsewhere_paths=elsewhere,
+        n_reads=sum(1 for i in inside if i.kind in READ_KINDS),
+        n_writes=sum(1 for i in inside if i.kind in WRITE_KINDS),
+        paths=paths,
+    )
+
+
+def needs_hand_read(use: ScratchUse) -> bool:
+    """Whether the automated flags for this run cannot be trusted on their own.
+
+    These are the runs where the checks might be undercounting, so they are the ones to
+    read by hand. Calibration comes from the disagreements, so the queue matters more
+    than the rate.
+    """
+    return use.unparsed or use.other
+
+
+def written_content(interactions: list[Interaction]) -> list[tuple[str, str]]:
+    """(path, content) for every write inside the directory that recorded its content.
+
+    Only `write_file` events and heredocs carry content. A write performed by an editor
+    tool or a shell redirection of a command's output does not, so this is a convenience
+    for hand-reading and not the source of truth. The source of truth is the directory
+    snapshot taken at the end of the run.
+    """
+    return [
+        (i.path or "", i.content or "")
+        for i in interactions
+        if i.relation == "inside" and i.kind == "write" and i.content
+    ]