Initial commit: shiro-neko 0.1.0-beta.1

Agentic coding CLI on Bun, Ink, and the AI SDK.

Core: streamText loop with SDK-level tool approval so a denied call provably never executes; endpoint fallback for OpenAI reasoning models; retry with backoff.

Tools: read/write/edit/glob/grep/bash, path-jailed, gitignore-aware, ripgrep with a JS fallback, binary rejection, live bash streaming.

Agents: five variants crossing thinking level with tool restriction; plan and review withhold mutating tools from the model.

Extensibility: frontmatter skills with on-demand bodies, plugin host with blocking hooks, MCP stdio and HTTP, read-only subagents.

State: durable per-project memory, session task lists, session persistence, compaction that repairs provider-item dependencies.

Distribution: five-platform cross-compiled binaries with checksums, install scripts, CI on three operating systems.

404 tests, typecheck clean.

src/pricing.ts

@@ -0,0 +1,52 @@
+export type Rate = { inputPerMTok: number; outputPerMTok: number };
+
+/**
+ * USD per million tokens. Prefix match on the model id, longest first, so
+ * `claude-sonnet-4-5-20250929` resolves via `claude-sonnet-4-5`. Published rates
+ * drift, so this is a best-effort estimate rather than a billing source.
+ */
+const RATES: Record<string, Rate> = {
+  'claude-opus-4': { inputPerMTok: 15, outputPerMTok: 75 },
+  'claude-sonnet-4': { inputPerMTok: 3, outputPerMTok: 15 },
+  'claude-haiku-4': { inputPerMTok: 1, outputPerMTok: 5 },
+  'claude-3-5-haiku': { inputPerMTok: 0.8, outputPerMTok: 4 },
+  'gpt-5-mini': { inputPerMTok: 0.25, outputPerMTok: 2 },
+  'gpt-5-nano': { inputPerMTok: 0.05, outputPerMTok: 0.4 },
+  'gpt-5': { inputPerMTok: 1.25, outputPerMTok: 10 },
+  'gpt-4o-mini': { inputPerMTok: 0.15, outputPerMTok: 0.6 },
+  'gpt-4o': { inputPerMTok: 2.5, outputPerMTok: 10 },
+  'o4-mini': { inputPerMTok: 1.1, outputPerMTok: 4.4 },
+  'deepseek-chat': { inputPerMTok: 0.27, outputPerMTok: 1.1 },
+  'deepseek-reasoner': { inputPerMTok: 0.55, outputPerMTok: 2.19 },
+  'grok-4': { inputPerMTok: 3, outputPerMTok: 15 },
+};
+
+/** Strips a provider prefix such as `anthropic/` that OpenRouter-style ids carry. */
+const bare = (modelId: string) => modelId.toLowerCase().split('/').at(-1) ?? modelId.toLowerCase();
+
+export function rateFor(modelId: string): Rate | undefined {
+  const id = bare(modelId);
+  const key = Object.keys(RATES)
+    .filter((k) => id.startsWith(k))
+    .sort((a, b) => b.length - a.length)[0];
+  return key ? RATES[key] : undefined;
+}
+
+export function costOf(modelId: string, inputTokens: number, outputTokens: number): number | undefined {
+  const rate = rateFor(modelId);
+  if (!rate) return undefined;
+  return (inputTokens / 1_000_000) * rate.inputPerMTok + (outputTokens / 1_000_000) * rate.outputPerMTok;
+}
+
+export function formatUsd(amount: number): string {
+  if (amount === 0) return '$0.00';
+  if (amount < 0.01) return `$${amount.toFixed(4)}`;
+  return `$${amount.toFixed(2)}`;
+}
+
+/** One-line token and cost summary, omitting the cost when the model is unpriced. */
+export function usageLine(modelId: string, inputTokens: number, outputTokens: number): string {
+  const tokens = `${inputTokens} in / ${outputTokens} out tokens`;
+  const cost = costOf(modelId, inputTokens, outputTokens);
+  return cost === undefined ? `${tokens} (${modelId} is unpriced)` : `${tokens} - ${formatUsd(cost)}`;
+}