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using Agent.Core.Ollama;
using Agent.Core.Prompts;
using Agent.Core.Sessions;
using Agent.Core.Skills;
using Agent.Core.Tasks;
using Agent.Core.Tools;
namespace Agent.Core.Runtime;
public sealed class AgentRuntime(TaskRegistry registry, IOllamaClient ollama, AgentRuntimeSettings settings, InternalToolDispatcher? toolDispatcher = null, IAgentRuntimeObserver? observer = null)
{
private readonly InternalToolDispatcher _tools = toolDispatcher ?? new(
new DenyByDefaultPolicy(InternalToolCatalog.All.Select(static item => item.Name).ToHashSet(StringComparer.Ordinal)),
new FakeInternalToolBackend());
private readonly IAgentRuntimeObserver _observer = observer ?? NullAgentRuntimeObserver.Instance;
public async Task ExecuteAsync(Guid taskId, CancellationToken cancellationToken)
{
if (!registry.TryGet(taskId, null, out TaskSnapshot? task) || task is null) return;
if (!registry.Sessions.TryGet(task.SessionId, out AgentSession? session) || session is null)
{
registry.Transition(taskId, AgentTaskState.Failed, result: "Session not found.");
return;
}
try
{
await _tools.BeginTaskAsync(taskId, cancellationToken).ConfigureAwait(false);
if (task.Images.Count > 0 && await ollama.SupportsVisionAsync(cancellationToken).ConfigureAwait(false) is false)
throw new InvalidOperationException(settings.VisionUnsupportedMessage);
var messages = PromptComposer.Compose(new PromptContext(
FixedPrompt.Load(),
settings.UserSystemPrompt,
settings.Locale,
settings.Skills,
[], // SelectedSkills: populated after LLM skill selection (Progressive Disclosure Stage 2→3).
settings.SandboxCapabilitySummary,
"Current task: " + task.Request,
string.Empty,
session.Conversation,
task.Request,
task.Images)).ToList();
var guard = new ToolUseGuard(settings.SameFailureLimit);
bool requiresExternalEffect = RequiresExternalEffect(task.Request);
bool externalEffectEvidence = false;
var unresolvedToolFailures = new Dictionary<string, string>(StringComparer.Ordinal);
IReadOnlyDictionary<string, int> requiredToolCalls = RequiredToolCalls(task.Request);
var successfulToolCalls = new Dictionary<string, int>(StringComparer.Ordinal);
string? finalContent = null;
for (int iteration = 0; iteration < settings.MaxIterations; iteration++)
{
_observer.LlmRequest(taskId, iteration, messages);
OllamaResult result = await ollama.ChatWithToolsAsync(messages, task.Temperature, InternalToolCatalog.All, cancellationToken).ConfigureAwait(false);
_observer.LlmResponse(taskId, iteration, result);
registry.AddUsage(taskId, result.InputTokens, result.OutputTokens);
IReadOnlyList<OllamaToolCall> calls = result.ToolCalls ?? [];
if (calls.Count > 0)
{
messages.Add(new OllamaMessage("assistant", result.Content, ToolCalls: calls));
string? failureFingerprint = null;
foreach (OllamaToolCall call in calls)
{
ToolExecutionResult toolResult;
try
{
toolResult = await _tools.DispatchAsync(taskId, call.Function.Name, call.Function.Arguments, cancellationToken).ConfigureAwait(false);
}
catch (UnauthorizedAccessException ex)
{
toolResult = new(false, ex.Message, false, $"{call.Function.Name}:{ex.GetType().Name}:{ex.Message}", RetryAllowed: false);
}
catch (Exception ex) when (ex is ToolValidationException or ArgumentException)
{
toolResult = new(false, ex.Message, false, $"{call.Function.Name}:{ex.GetType().Name}:{ex.Message}");
}
externalEffectEvidence |= toolResult.Success && toolResult.ExternalEffect;
if (toolResult.Success) unresolvedToolFailures.Remove(call.Function.Name);
else unresolvedToolFailures[call.Function.Name] = toolResult.FailureFingerprint ?? toolResult.Output;
if (toolResult.Success) successfulToolCalls[call.Function.Name] = successfulToolCalls.GetValueOrDefault(call.Function.Name) + 1;
_observer.ToolResult(taskId, call.Function.Name, toolResult);
if (!toolResult.Success && !toolResult.RetryAllowed)
throw new InvalidOperationException($"Tool '{call.Function.Name}' was denied by sandbox policy and will not be retried: {toolResult.Output}");
failureFingerprint = toolResult.FailureFingerprint ?? failureFingerprint;
messages.Add(new OllamaMessage("tool", toolResult.Output, ToolName: call.Function.Name));
}
ToolUseGuardResult callGuard = guard.Evaluate(requiresExternalEffect, true, externalEffectEvidence, failureFingerprint);
if (callGuard.Decision == ToolUseGuardDecision.Fail) throw new InvalidOperationException(callGuard.Observation);
continue;
}
if (unresolvedToolFailures.Count > 0)
{
messages.Add(new OllamaMessage("system", "Completion is not allowed while tool failures remain unresolved. Retry or correct: " +
string.Join("; ", unresolvedToolFailures.Select(static item => $"{item.Key}={item.Value}"))));
continue;
}
string[] missingCalls = requiredToolCalls
.Where(requirement => successfulToolCalls.GetValueOrDefault(requirement.Key) < requirement.Value)
.Select(requirement => $"{requirement.Key}: {successfulToolCalls.GetValueOrDefault(requirement.Key)}/{requirement.Value}")
.ToArray();
if (missingCalls.Length > 0)
{
messages.Add(new OllamaMessage("system", "Completion is not allowed because the request explicitly requires successful tool calls that are still missing: " + string.Join("; ", missingCalls)));
continue;
}
ToolUseGuardResult completion = guard.Evaluate(requiresExternalEffect, false, externalEffectEvidence);
if (completion.Decision == ToolUseGuardDecision.Retry)
{
messages.Add(new OllamaMessage("system", completion.Observation));
continue;
}
if (completion.Decision == ToolUseGuardDecision.Fail) throw new InvalidOperationException(completion.Observation);
finalContent = result.Content;
break;
}
if (finalContent is null) throw new InvalidOperationException($"Agent exceeded the iteration limit of {settings.MaxIterations}.");
string? cleanupFailure = await EndTaskSafelyAsync(taskId, true, CancellationToken.None).ConfigureAwait(false);
if (cleanupFailure is not null) throw new InvalidOperationException(cleanupFailure);
session.Append(new ConversationMessage("user", task.Request));
session.Append(new ConversationMessage("assistant", finalContent));
registry.Transition(taskId, AgentTaskState.Completed, result: finalContent);
}
catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
{
string? cleanupFailure = await EndTaskSafelyAsync(taskId, false, CancellationToken.None).ConfigureAwait(false);
string result = cleanupFailure is null ? "Cancelled." : $"Cancelled. {cleanupFailure}";
registry.Transition(taskId, AgentTaskState.Cancelled, result: result);
}
catch (Exception ex) when (ex is not (OutOfMemoryException or StackOverflowException or AccessViolationException))
{
string? cleanupFailure = await EndTaskSafelyAsync(taskId, false, CancellationToken.None).ConfigureAwait(false);
string result = cleanupFailure is null ? ex.Message : $"{ex.Message} {cleanupFailure}";
registry.Transition(taskId, AgentTaskState.Failed, result: result);
}
}
private async Task<string?> EndTaskSafelyAsync(Guid taskId, bool success, CancellationToken cancellationToken)
{
try
{
await _tools.EndTaskAsync(taskId, success, cancellationToken).ConfigureAwait(false);
return null;
}
catch (Exception ex) when (ex is not (OutOfMemoryException or StackOverflowException or AccessViolationException))
{
return $"Task resource cleanup failed: {ex.Message}";
}
}
private static bool RequiresExternalEffect(string request)
{
string normalized = request.ToLowerInvariant();
string[] indicators = ["edit", "modify", "change", "fix", "write", "delete", "create", "build", "test", "run", "修正", "変更", "編集", "作成", "削除", "ビルド", "テスト", "実行"];
return indicators.Any(normalized.Contains);
}
private static IReadOnlyDictionary<string, int> RequiredToolCalls(string request)
{
var result = new Dictionary<string, int>(StringComparer.Ordinal);
foreach (InternalToolDefinition tool in InternalToolCatalog.All)
{
int count = 0;
int offset = 0;
while ((offset = request.IndexOf(tool.Name, offset, StringComparison.OrdinalIgnoreCase)) >= 0)
{
count++;
offset += tool.Name.Length;
}
if (count > 0) result[tool.Name] = count;
}
return result;
}
}
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