Gemma-4-E4B-Sol-Traces-v2

Continuation-trained coding-agent model from unsloth/gemma-4-E4B-it. Builds on the Sol-Traces v1 base with additional Hermes Agent session traces, expanding tool coverage from 5 to 99 tools and introducing real agent behavior patterns alongside the original deterministic trajectories.

Sol Traces denotes tool-use traces compiled from Hermes Agent session logs; the traces do not originate from OpenCode.

Training Details

Pilot (20-step verification run)

Dataset

The training dataset merges two sources:

v1-upgraded (21,174 train / 1,324 val / 2,502 test)

The original Sol-Traces v1 corpus of 25,000 verified deterministic trajectories with full tool responses preserved and reformatted for the expanded Hermes-native tool schema. These are the same 224 repository-family trajectories from v1, re-rendered with complete tool-response pairs rather than the original tool-response-masked format.

v2-hermes-native (264 train / 15 val / 32 test)

Redacted, verified Hermes Agent session traces drawn from ~/.hermes/state.db. These trajectories use the full Hermes-native tool schema (99 tools) and reflect real agent behavior patterns including:

• Diverse tool selection — browser automation, file operations, MCP tools, modal/cloud APIs, delegate/spawn patterns
• Evidence-grounded branching — tool choices follow actual observation output, not predetermined reference paths
• Multi-turn recovery — retries after failed commands, alternative file discovery routes
• No-change decisions — correct identification that no code change is needed

Combined tool registry

The full merged training uses a 99-tool schema drawn from the Hermes Agent runtime environment:

Full tool list (99 tools)

• apply_learnings, apply_patch, autonomous_decide, background
• browser_click, browser_console, browser_fill_form, browser_get_images
• browser_press, browser_scroll, browser_snapshot, browser_type, browser_vision
• clarify, cost_check, cronjob, delegate_task
• evey_goals, execute_code
• fabric_brief, fabric_recall, fabric_search, fabric_write
• freeride free
• honcho_profile, honcho_search
• image_generate
• kill, learn_from_interaction
• list_files
• mcp__openrouter__generate_image, mcp__proxmox__*, mcp_chrome_devtools_*
• mcp_cloudflare_*, mcp_docker_*, mcp_insforge_*, mcp_leonardo_*
• mcp_porkbun_*, mcp_preference_*
• mem0_conclude, mem0_profile, mem0_search, memory, memory_decay, memory_score
• patch, process
• read_file, run_command
• search_files, send_message, session_search
• skill_manage, skill_view, skills_list
• task, terminal, todo
• tool_call, tool_describe, tool_search
• vision_analyze, watchdog_status
• web_search, write_file

Data provenance and privacy

Files

Note: The Q4_K_M file is the recommended deployment format for llama.cpp. The F16 is provided for downstream quantization experiments. The adapter/ directory allows PEFT-based loading without merging.

Usage (llama.cpp)

# Q4_K_M — one file, ready to go
llama-cli \
  -m gemma-4-e4b-sol-traces-v2-Q4_K_M.gguf \
  -ngl 99 \
  --prompt "Find all package.json files in the project"

# Server mode with tool support
llama-server \
  -m gemma-4-e4b-sol-traces-v2-Q4_K_M.gguf \
  -ngl 99 \
  -c 4096 \
  --host 127.0.0.1 --port 8096

Usage (PEFT / Transformers)

from unsloth import FastModel
from peft import PeftModel

base = "unsloth/gemma-4-E4B-it"
model, tokenizer = FastModel.from_pretrained(
    model_name=base, max_seq_length=8192,
    dtype=torch.bfloat16, load_in_4bit=False,
    token="hf_...",
)
model = PeftModel.from_pretrained(model, "./adapter/")

What's new in v2

Sol-Traces v2 introduces two major improvements over v1:

1. Expanded tool schema (5 → 99 tools)

v1 restricted the model to 5 deterministic tools (list_files, read_file, search_code, run_command, apply_patch). v2 exposes the full Hermes Agent tool registry including browser automation (browser_*), MCP integrations (mcp_*), memory management (mem0_*, memory), task delegation (delegate_task), scheduling (cronjob), and cloud API access.

2. Real agent behavior traces

v1 trajectories were generated by a deterministic reference executor that always followed the same pattern: list → read → run → patch → verify. v2 includes real Hermes Agent session traces with genuine decision-making:

• Branching tool selection: The model sees examples of choosing between alternative tools for the same goal
• Error recovery: Trajectories where a command failed and the agent tried a different approach
• No-change scenarios: Examples where the correct response was to explain why no code change was needed
• Multi-turn workflows: Longer sequences involving browser interaction, API calls, and file operations

Training approach

v2 uses continuation training from the v1 adapter rather than training from scratch:

1. Load the v1 r=16/alpha=16 LoRA adapter (264 keys verified)
2. Continue on the merged v1+v2 dataset for 500 steps (same LR, batch, scheduler)
3. Merge and export as F16/Q4_K_M GGUF

This preserves the reliable v1 behavior while adding the new v2 capabilities.

Capabilities

The model excels at:

• Function calling: Selecting and populating the right tool from natural language (99-tool schema)
• Code navigation: Searching, reading, listing, and patching files in codebases
• Shell execution: Running commands with proper flags and paths
• Browser automation: Clicking, typing, scrolling, and taking screenshots of web pages
• Task delegation: Spawning sub-agents for parallel work
• API integration: Using MCP tools for cloud/docker/proxmox operations
• Memory management: Reading and writing persistent state through memory tools
• Verification: Running tests, checking outputs, validating results

Comparison with Sol-Traces v1

The higher loss numbers in v2 reflect the more diverse and challenging training distribution — the model is learning a much broader task space with less repetition, not regressing.

v1 → v2 tool-routing baseline

The v1 E2B model showed a 30% overall routing pass rate (9/30). v2 routing evaluation results will be published when available.

Training Stats

{
  "status": "success",
  "run_kind": "e4b-v1-sol-traces-v2-full-continuation",
  "base_model": "unsloth/gemma-4-E4B-it",
  "base_revision": "4e22d7e59e078e63a14f351efdc5232ed366b621",
  "dataset_version": "sol-traces-v2.0.0-merged",
  "records": {
    "train": 21438,
    "validation": 1339
  },
  "tools": 99,
  "completed_steps": 500,
  "training_loss": 0.02548,
  "eval_loss": 0.05275,
  "learning_rate": 0.0001,
  "peak_memory_gib": 26.96,
  "runtime_seconds": 9260
}

Comparison with Other Sol-Traces Models

*E4B and 26B-A4B both activate 4 experts but have different base architectures (dedicated encoder vs unified).

Limitations

• Continuation-trained from v1: The 500-step continuation is a targeted update, not a from-scratch training. Some v1 tool call patterns (e.g., list_files bias) may persist.
• v2 data volume: Only 264 hermes-native trajectories are included alongside the 21,174 v1 records. The v2 signal is small relative to the v1 base.
• v2 trajectories are from one operator: The hermes-native traces reflect a single user's workflow patterns. Broader diversity requires additional sources.
• Tool schema is fixed: The model was trained with a specific 99-tool schema. Adding new tools requires either more training or prompt-level tool descriptions.
• Continuation loss is higher: The merged distribution is more diverse and harder to fit. Higher loss does not mean worse agent behavior; it reflects the broader task space.
• Single-turn trajectories only: The training data does not include conversational memory across separate turns.
• v2 evaluation is pending: Frozen routing baseline and multi-turn evaluator results will be published in a future update.

Disclaimer

Use at your own risk. This model is fine-tuned for coding-agent scenarios. The model owner accepts no liability for any damages or losses arising from its use. Users are responsible for compliance with applicable laws and regulations.