FA-21011 / Assistive announcements / Open access
Failure cue leaves progress announcements enabled · case 01
The announcement trace violates the stated progress-narration contract.
ROOT CAUSE
Fault site: t[3]='failed'; out.append(t[0]+': failed') is implemented as out.append(t[0]+': failed')
VERIFIED REPAIR
Restore the stated transition: t[3]='failed'; out.append(t[0]+': failed')
Unsuccessful approach: The attempted repair substitutes t[3]='failed'; out.append(t[0]+': complete') and still violates a regression oracle.
Case contract
A task start records total and resets spoken milestone. Advance clamps monotone completion to total; a 25-percent bucket is announced only when it increases and before terminal status. Unknown total uses item-count messages. Complete announces exactly once, even for zero total. Fail announces failure and blocks progress. Retry reopens at zero and resets milestone. Rename affects future messages. Cancel drops task silently. Return speech and [id,done,status,bucket].
Why this case matters
Deterministic controlled model of assistive announcement delivery.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(events):
tasks={}; out=[]
for e in events:
if e[0]=='start': tasks[e[1]]=[e[2],e[3],0,'running',0]
elif e[0]=='cancel': tasks.pop(e[1],None)
elif e[1] in tasks:
t=tasks[e[1]]
if e[0]=='rename': t[0]=e[2]
elif e[0]=='retry': t[2]=0; t[3]='running'; t[4]=0
elif e[0]=='fail' and t[3]=='running': out.append(t[0]+': failed')
elif e[0]=='complete' and t[3]=='running': t[3]='complete'; out.append(t[0]+': complete')
elif e[0]=='advance' and t[3]=='running':
t[2]=max(t[2],min(e[2],t[1]) if t[1]>=0 else e[2])
if t[1]<0: out.append(t[0]+': '+str(t[2])+' items')
elif t[1]>0:
bucket=t[2]*4//t[1]
if bucket>t[4]: out.append(t[0]+': '+str(bucket*25)+'%'); t[4]=bucket
return [out,[[k,v[2],v[3],v[4]] for k,v in tasks.items()]]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['start','a','Download',4*N],['advance','a',N],['advance','a',N],['advance','a',0],['advance','a',8*N],['complete','a'],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['advance','a',4*N],['retry','a'],['advance','a',N],['rename','a','Retry'],['complete','a']]", "[['start','a','Unknown',-1],['advance','a',N+2],['advance','a',N],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['retry','a']]", "[['start','a','Zero',0],['complete','a'],['start','a','Again',N],['complete','a']]", "[['start','a','A',N],['start','b','B',N],['cancel','a']]", "[['start','a','Round',4*N+1],['advance','a',N]]", '[]']
expected = {1: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]], [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 1, 'running', 0]]], [[], []]], 2: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 8, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 2, 'complete', 1]]], [['Unknown: 4 items', 'Unknown: 4 items', 'Unknown: complete'], [['a', 4, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 2, 'running', 0]]], [[], []]], 3: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 12, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 3, 'complete', 1]]], [['Unknown: 5 items', 'Unknown: 5 items', 'Unknown: complete'], [['a', 5, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 3, 'running', 0]]], [[], []]], 4: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 16, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 4, 'complete', 1]]], [['Unknown: 6 items', 'Unknown: 6 items', 'Unknown: complete'], [['a', 6, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 4, 'running', 0]]], [[], []]], 5: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 20, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 5, 'complete', 1]]], [['Unknown: 7 items', 'Unknown: 7 items', 'Unknown: complete'], [['a', 7, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 5, 'running', 0]]], [[], []]]}[N]
for i, expression in enumerate(fixtures):
check("trace-"+str(i+1), solve(eval(expression)), expected[i])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| trace-1 | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | Passed |
| trace-2 | [['Work: 25%', 'Work: failed', 'Work: 100%', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | Failed |
| trace-3 | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | Passed |
| trace-4 | [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]] | [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]] | Passed |
| trace-5 | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | Passed |
| trace-6 | [[], [['b', 0, 'running', 0]]] | [[], [['b', 0, 'running', 0]]] | Passed |
| trace-7 | [[], [['a', 1, 'running', 0]]] | [[], [['a', 1, 'running', 0]]] | Passed |
| trace-8 | [[], []] | [[], []] | Passed |
SHA-256 / 88586e0cb3621d2337a4423cddf889f95cbded3538d85e766e0738be6569cade
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(events):
tasks={}; out=[]
for e in events:
if e[0]=='start': tasks[e[1]]=[e[2],e[3],0,'running',0]
elif e[0]=='cancel': tasks.pop(e[1],None)
elif e[1] in tasks:
t=tasks[e[1]]
if e[0]=='rename': t[0]=e[2]
elif e[0]=='retry': t[2]=0; t[3]='running'; t[4]=0
elif e[0]=='fail' and t[3]=='running': t[3]='failed'; out.append(t[0]+': complete')
elif e[0]=='complete' and t[3]=='running': t[3]='complete'; out.append(t[0]+': complete')
elif e[0]=='advance' and t[3]=='running':
t[2]=max(t[2],min(e[2],t[1]) if t[1]>=0 else e[2])
if t[1]<0: out.append(t[0]+': '+str(t[2])+' items')
elif t[1]>0:
bucket=t[2]*4//t[1]
if bucket>t[4]: out.append(t[0]+': '+str(bucket*25)+'%'); t[4]=bucket
return [out,[[k,v[2],v[3],v[4]] for k,v in tasks.items()]]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['start','a','Download',4*N],['advance','a',N],['advance','a',N],['advance','a',0],['advance','a',8*N],['complete','a'],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['advance','a',4*N],['retry','a'],['advance','a',N],['rename','a','Retry'],['complete','a']]", "[['start','a','Unknown',-1],['advance','a',N+2],['advance','a',N],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['retry','a']]", "[['start','a','Zero',0],['complete','a'],['start','a','Again',N],['complete','a']]", "[['start','a','A',N],['start','b','B',N],['cancel','a']]", "[['start','a','Round',4*N+1],['advance','a',N]]", '[]']
expected = {1: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]], [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 1, 'running', 0]]], [[], []]], 2: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 8, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 2, 'complete', 1]]], [['Unknown: 4 items', 'Unknown: 4 items', 'Unknown: complete'], [['a', 4, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 2, 'running', 0]]], [[], []]], 3: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 12, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 3, 'complete', 1]]], [['Unknown: 5 items', 'Unknown: 5 items', 'Unknown: complete'], [['a', 5, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 3, 'running', 0]]], [[], []]], 4: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 16, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 4, 'complete', 1]]], [['Unknown: 6 items', 'Unknown: 6 items', 'Unknown: complete'], [['a', 6, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 4, 'running', 0]]], [[], []]], 5: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 20, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 5, 'complete', 1]]], [['Unknown: 7 items', 'Unknown: 7 items', 'Unknown: complete'], [['a', 7, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 5, 'running', 0]]], [[], []]]}[N]
for i, expression in enumerate(fixtures):
check("trace-"+str(i+1), solve(eval(expression)), expected[i])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| trace-1 | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | Passed |
| trace-2 | [['Work: 25%', 'Work: complete', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | Failed |
| trace-3 | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | Passed |
| trace-4 | [['Work: 25%', 'Work: complete'], [['a', 0, 'running', 0]]] | [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]] | Failed |
| trace-5 | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | Passed |
| trace-6 | [[], [['b', 0, 'running', 0]]] | [[], [['b', 0, 'running', 0]]] | Passed |
| trace-7 | [[], [['a', 1, 'running', 0]]] | [[], [['a', 1, 'running', 0]]] | Passed |
| trace-8 | [[], []] | [[], []] | Passed |
SHA-256 / b126d26c5ea1c20b8c1f70ea6cbcc0ffcb611d925a12805ed912ab391e7a8162
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(events):
tasks={}; out=[]
for e in events:
if e[0]=='start': tasks[e[1]]=[e[2],e[3],0,'running',0]
elif e[0]=='cancel': tasks.pop(e[1],None)
elif e[1] in tasks:
t=tasks[e[1]]
if e[0]=='rename': t[0]=e[2]
elif e[0]=='retry': t[2]=0; t[3]='running'; t[4]=0
elif e[0]=='fail' and t[3]=='running': t[3]='failed'; out.append(t[0]+': failed')
elif e[0]=='complete' and t[3]=='running': t[3]='complete'; out.append(t[0]+': complete')
elif e[0]=='advance' and t[3]=='running':
t[2]=max(t[2],min(e[2],t[1]) if t[1]>=0 else e[2])
if t[1]<0: out.append(t[0]+': '+str(t[2])+' items')
elif t[1]>0:
bucket=t[2]*4//t[1]
if bucket>t[4]: out.append(t[0]+': '+str(bucket*25)+'%'); t[4]=bucket
return [out,[[k,v[2],v[3],v[4]] for k,v in tasks.items()]]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['start','a','Download',4*N],['advance','a',N],['advance','a',N],['advance','a',0],['advance','a',8*N],['complete','a'],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['advance','a',4*N],['retry','a'],['advance','a',N],['rename','a','Retry'],['complete','a']]", "[['start','a','Unknown',-1],['advance','a',N+2],['advance','a',N],['complete','a']]", "[['start','a','Work',4*N],['advance','a',N],['fail','a'],['retry','a']]", "[['start','a','Zero',0],['complete','a'],['start','a','Again',N],['complete','a']]", "[['start','a','A',N],['start','b','B',N],['cancel','a']]", "[['start','a','Round',4*N+1],['advance','a',N]]", '[]']
expected = {1: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]], [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 1, 'running', 0]]], [[], []]], 2: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 8, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 2, 'complete', 1]]], [['Unknown: 4 items', 'Unknown: 4 items', 'Unknown: complete'], [['a', 4, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 2, 'running', 0]]], [[], []]], 3: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 12, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 3, 'complete', 1]]], [['Unknown: 5 items', 'Unknown: 5 items', 'Unknown: complete'], [['a', 5, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 3, 'running', 0]]], [[], []]], 4: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 16, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 4, 'complete', 1]]], [['Unknown: 6 items', 'Unknown: 6 items', 'Unknown: complete'], [['a', 6, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 4, 'running', 0]]], [[], []]], 5: [[['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 20, 'complete', 4]]], [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 5, 'complete', 1]]], [['Unknown: 7 items', 'Unknown: 7 items', 'Unknown: complete'], [['a', 7, 'complete', 0]]], [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]], [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]], [[], [['b', 0, 'running', 0]]], [[], [['a', 5, 'running', 0]]], [[], []]]}[N]
for i, expression in enumerate(fixtures):
check("trace-"+str(i+1), solve(eval(expression)), expected[i])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| trace-1 | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | [['Download: 25%', 'Download: 100%', 'Download: complete'], [['a', 4, 'complete', 4]]] | Passed |
| trace-2 | [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | [['Work: 25%', 'Work: failed', 'Work: 25%', 'Retry: complete'], [['a', 1, 'complete', 1]]] | Passed |
| trace-3 | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | [['Unknown: 3 items', 'Unknown: 3 items', 'Unknown: complete'], [['a', 3, 'complete', 0]]] | Passed |
| trace-4 | [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]] | [['Work: 25%', 'Work: failed'], [['a', 0, 'running', 0]]] | Passed |
| trace-5 | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | [['Zero: complete', 'Again: complete'], [['a', 0, 'complete', 0]]] | Passed |
| trace-6 | [[], [['b', 0, 'running', 0]]] | [[], [['b', 0, 'running', 0]]] | Passed |
| trace-7 | [[], [['a', 1, 'running', 0]]] | [[], [['a', 1, 'running', 0]]] | Passed |
| trace-8 | [[], []] | [[], []] | Passed |
SHA-256 / c55b571569059db6f4393d6a07583784fbf331fb0d653cdf2bc1fa81215398b3
Verification & scope
Stipulated bounded policy, not a browser, speech engine, platform API, or standards conformance claim. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.
Observations recorded using Python 3.12.14 at 2026-09-29T14:40:24.532453+00:00.
Case digest / 17878ce1daa2a5c814f92aeec5baeaf70004da3d2322b90f1c33fa488b20f6f8