---
language:
- en
tags:
- agent-trajectories
- osworld
- interface-evolution
---
# Shadow Interface Evolution Trajectories

OSWorld V2 evaluation trajectories from Shadow Interface Evolution, and the evolved shadow-interface source trees that produced them.

| Archive | Evolution experiment | Variant | Trajectories | Full-credit accuracy | Mean partial score |
| --- | --- | --- | ---: | ---: | ---: |
| prime25v15r4_if-006_trajectories.zip | prime25v15r4 | if-006 | 68 | 17/68 (25.0%) | 0.6240 |
| opus5xover25v15_if-010_trajectories.zip | opus5xover25v15 | if-010 | 68 | 16/68 (23.5%) | 0.5834 |

Each archive contains only `claude_trajectory.jsonl` files, preserving the original evaluation batch and task directory structure. Separate screenshot files, result files, and task-cache artifacts are not included.

Scores use all 68 held-out tasks as the denominator, counting infrastructure failures as zero. Both runs have infrastructure-imputed zeros for tasks 002, 018, and 024. Trajectory presence does not imply a successful or complete task execution.

The if-006 archive combines the original 33-task batch and the remaining 35-task batch. The if-010 archive is from the crossover experiment (`opus5xover25v15`), evaluated in run `20260906T174130Z`.

## opus5xover25v15 seed

`opus5xover25v15_seed_trajectories.zip` contains 40 `claude_trajectory.jsonl` files from the independently evaluated `opus5xover25v15-seed`, preserving the original task directory structure. It covers 25 training tasks and 15 validation tasks; this is not a held-out 68-task baseline. Separate result and screenshot files are not included.

Across these 40 tasks, full-credit accuracy is 4/40 (10.0%) and mean partial score is 0.3135557204. These scores are from the seed records in `shadow_evolution_osworld_v2_opus5xover25v15.db` and are not directly comparable to the held-out scores above. The recorded run uses Qwen3.8-27B through OpenRouter/novita, a 1M context window, and a two-hour per-task time limit.

## prime25v15r4 seed

`prime25v15r4_seed_trajectories.zip` contains 40 `claude_trajectory.jsonl` files from `prime25v15r4-seed`, preserving the original task directory structure. It covers 25 training tasks and 15 validation tasks; this is not a held-out 68-task baseline. Separate result and screenshot files are not included.

Across these 40 tasks, full-credit accuracy is 7/40 (17.5%) and mean partial score is 0.3890158997. These scores are from the seed records in `shadow_evolution_osworld_v2_prime25v15r4.db` and are not directly comparable to the held-out scores above. This seed was evaluated independently of `opus5xover25v15-seed`; their results and trajectories are distinct.

The recorded run uses Qwen3.8-27B through OpenRouter/novita, an effective 1M context window, and no per-task wall-clock limit. Although its saved interface configuration declares `context_window_tokens: 131072`, that field was not wired into Prime during this evaluation, so the model catalog window applied. Other step and runtime termination conditions may still apply.

## qwen_synthetic30v15 (seed and if-001)

`qwen_synthetic30v15_seed_trajectories.zip` and
`qwen_synthetic30v15_if-001_trajectories.zip` contain 38 trajectory files each
from `qwen_synthetic30v15-seed` and its one mutation `qwen_synthetic30v15-if-001`,
preserving the original task directory structure. Alongside the 36
`claude_trajectory.jsonl` files, each archive carries the two retry/phase
trajectories that those runs produced (`claude_trajectory_attempt_2.jsonl`,
`claude_trajectory_phase_1.jsonl`). Separate result and screenshot files and
task-cache artifacts are not included.

This experiment uses a different split from the archives above: 30 **synthetic**
training tasks (`s_001`–`s_030`) plus the same 15 validation tasks. It is not a
held-out 68-task baseline.

| Archive | Variant | Trajectories | Val full-credit | Val mean partial |
| --- | --- | ---: | ---: | ---: |
| qwen_synthetic30v15_seed_trajectories.zip | seed | 36 (21 train + 15 val) | 1/15 (6.7%) | 0.2349933333 |
| qwen_synthetic30v15_if-001_trajectories.zip | if-001 | 36 (21 train + 15 val) | 2/15 (13.3%) | 0.3243400000 |

**Only the validation column is a score.** The 30 synthetic training tasks have
no verifiers; their recorded score is a dummy constant zero, labelled in each
`result.json` as `UNGRADED: constant zero; use trajectories, not scores`. A
combined 36-task accuracy would therefore be meaningless, and none is given.
Validation figures come from the variant records in
`shadow_evolution_osworld_v2_qwen_synthetic30v15.db`.

**Nine training tasks are missing from both archives**: `s_003`, `s_010`,
`s_011`, `s_013`, `s_016`, `s_020`, `s_022`, `s_027`, `s_028`. These are exactly
the nine synthetic tasks that drive a web application, and all nine failed
environment setup on every attempt in both rounds, producing no trajectory at
all. The cause was a defect in the imported task package, since fixed: the web
task configs never launched Chrome, so setup could not reach it over CDP. Both
variants in this experiment were therefore evolved and evaluated against 21 of
30 training trajectories, all of them desktop-only. The validation gain from
seed to if-001 should not be read as evidence about browser tasks.

The recorded run uses Qwen3.8-27B for both the builder and the task agent
through OpenRouter/novita with fallbacks disabled, the Prime Agent harness, an
interface-declared context window, 300 agent steps and a two-hour wall-clock
limit per task, and a linear mutation-only route with latest-parent selection.

## qwen_syn30v15_fixed (seed + five evolution steps, with software repositories)

This is the corrected rerun of the `qwen_synthetic30v15` experiment above. The
task-package defect that starved the earlier run of its nine web tasks is
fixed, so **every variant here was evolved against the full 30 training
trajectories** (bar six individual task failures noted below). It runs five
evolution steps instead of one, with crossover enabled at cadence 2 and
tournament parent selection, which produces a branching lineage rather than a
linear chain.

It is also the first entry in this dataset to publish the **evolved software
repositories** alongside the trajectories. For each variant,
`qwen_syn30v15_fixed_<variant>_software_repository.zip` contains the complete
`shadow_interface/` source tree at that variant's git tag — the artifact the
builder actually evolved, and the thing the agent imports at task time.
`qwen_syn30v15_fixed/manifest.json` records each variant's git tag and commit,
parent, operation, step, validation score, and file counts.

| Archive pair | Variant | Operation | Parent | Trajectories | Source files | Val full-credit | Val mean partial |
| --- | --- | --- | --- | ---: | ---: | ---: | ---: |
| qwen_syn30v15_fixed_seed_* | seed | seed | — | 45 (30 train + 15 val) | 10 | 1/15 (6.7%) | 0.2350 |
| qwen_syn30v15_fixed_if-001_* | if-001 | mutation | seed | 42 (29 train + 13 val) | 14 | 0/15 (0.0%) | 0.1747 |
| qwen_syn30v15_fixed_if-002_* | if-002 | crossover | seed | 45 (30 train + 15 val) | 14 | **3/15 (20.0%)** | 0.2850 |
| qwen_syn30v15_fixed_if-003_* | if-003 | mutation | if-002 | 45 (30 train + 15 val) | 15 | 1/15 (6.7%) | **0.3390** |
| qwen_syn30v15_fixed_if-004_* | if-004 | crossover | if-002 | 44 (30 train + 14 val) | 15 | 2/15 (13.3%) | 0.2267 |
| qwen_syn30v15_fixed_if-005_* | if-005 | mutation | if-003 | 44 (30 train + 14 val) | 21 | 1/15 (6.7%) | 0.1879 |

**Only the validation columns are scores.** As above, the 30 synthetic training
tasks have no verifiers and record a dummy constant zero labelled `UNGRADED:
constant zero; use trajectories, not scores`. Validation figures come from the
variant records in `shadow_evolution_osworld_v2_qwen_syn30v15_fixed.db`.

The lineage branches: `seed -> if-001` and `seed -> if-002`, then
`if-002 -> if-003` and `if-002 -> if-004`, then `if-003 -> if-005`. The peak is
if-003 at 0.3390 mean partial, a 44% relative gain over the seed; if-002 has the
highest full-credit count. The two steps after if-003 both regress, so this run
gives no evidence that further steps would help.

**Six trajectories are missing, and none of them is the old Chrome fault.**
Across all 270 task runs there were zero `ECONNREFUSED` failures, zero browser
UTC failures, and zero tracebacks. The gaps are: `s_003`, `046` and `072` in
if-001; `072` in if-004; `007` and `072` in if-005. Five of the six are a
transient outage of the `teamchat.site.hku.icu` task website, which recovered
during the run; `007` in if-005 is a user-simulator failure. Task `072` is the
seed's only full-credit validation task, and losing it in three separate
variants depresses those variants' validation scores relative to the seed.

The recorded run uses Qwen3.8-27B for both the builder and the task agent
through OpenRouter/novita with fallbacks disabled, the Prime Agent harness, an
interface-declared context window, 300 agent steps and a two-hour wall-clock
limit per task, 40 concurrent VMs, and a deterministic scheduler with crossover
cadence 2. Total API cost across the six variants was $396.13, of which $4.60
was the builder and $391.53 the task agent.

GitLab personal access tokens that a task agent minted inside a task VM's own
GitLab instance have been redacted from the if-004 archive. Those VMs were
destroyed at the end of the run; the redaction is a precaution, not a response
to a live credential.