diff --git a/.gitignore b/.gitignore
index 8a2a435..e1f70c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 examples/.env
-examples/invoice.pdf
\ No newline at end of file
+examples/invoice.pdf
+examples/prompts.log
diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..e163da4
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,75 @@
+# AGENTS.md
+
+Orientation notes for AI coding assistants working in this repo. Read this first.
+
+## What this is
+
+`llmorbiter` — a small (v0.1.0, 0BSD) **LLM tool-calling orchestrator with provider
+abstraction**. Pure ES modules (`"type": "module"`). Only runtime dependency is `dotenv`.
+No build step, no test runner, no README (this file is the orientation doc).
+
+## Layout
+
+```
+src/
+  index.js                    # public entry — re-exports everything
+  LLMOrbiter.js               # core orchestrator  (~364 lines)
+  Tool.js                     # defineTool() + ToolError + DirectReturnError
+  providers/
+    OpenRouterProvider.js     # streaming OpenRouter SSE provider
+
+examples/
+  weather.js                  # minimal tool-calling demo
+  tool-error-retry.js         # tool-error + LLM self-correction demo (has PASS/FAIL asserts)
+  pdf-pages.js                # PDF -> per-page LLM processing (500 lines, largest)
+  tools/weather.js            # sample static-data weather tool
+```
+
+## Public API (`src/index.js`)
+
+Exports: `LLMOrbiter`, `OpenRouterProvider`, `defineTool`, `ToolError`, `DirectReturnError`.
+
+- `defineTool({ name, description, parameters, strict=true, invoke })` -> `{ spec, invoke, name }`.
+  `spec` is the OpenAI-compatible function schema sent to the LLM; `invoke(args, { signal })`
+  is the local implementation.
+- `ToolError(message)` — throw from a tool to signal a recoverable error back to the LLM.
+- `DirectReturnError(data)` — throw from a tool to stop the loop immediately; `run()` resolves
+  with `{ directReturn: true, data, ... }`.
+
+### `new LLMOrbiter(provider, opts)`
+
+`opts` are lifecycle callbacks: `onLLMCall`, `onUsage`, `onToolCall`, `onToolError`,
+`onToolResult`, `onStatus`, `onContent`, `onReasoning`.
+
+### `orbiter.run(opts)`
+
+`{ prompt, messages, model, tools, maxIterations=10, tool_choice, extraBody, signal }`.
+
+Loop: send messages + tool specs -> if `tool_calls` come back, invoke locals and feed results
+back -> repeat until no more tool calls or `maxIterations`. Returns
+`{ content, toolResults, usage, rawUsage, iterations, messages, ... }`; the returned `messages`
+can seed the next `run()` for conversation continuity (a leading `{role:'system'}` entry is the
+system prompt). `orbiter.abort(reason)` cancels the active run; aborts surface as
+`DOMException('...', 'AbortError')`.
+
+### `OpenRouterProvider`
+
+`new OpenRouterProvider({ apiKey, apiUrl, siteUrl, siteName })`. Method:
+`chatCompletions({ model, messages, tools, tool_choice, signal, extraBody, onStatus, onContent, onReasoning })`
+— streams SSE, assembles `{ content, tool_calls, finish_reason, usage, reasoning_details, reasoning }`.
+`apiUrl` defaults to `https://openrouter.ai/api/v1/chat/completions`.
+
+## Gotchas / notes
+
+- Examples need `OPENROUTER_API_KEY` (in `examples/.env` or via `--key`). Default model in the
+  examples: `deepseek/deepseek-v4-flash-0731`.
+- `.gitignore` ignores `node_modules/`, `examples/.env`, `examples/invoice.pdf`.
+- `pdf-pages.js` shells out to `pdftotext -layout`, splits pages on `\f`, and appends prompts
+  to `examples/prompts.log`.
+- `OpenRouterProvider._readStream` currently writes reasoning straight to `process.stdout`
+  (debug-style side effect) rather than only via `onReasoning` — worth knowing if refactoring.
+
+## Style conventions observed
+
+- 4-space indent, single quotes, semicolons, `'use strict';` header.
+- Comments use em dashes (`—`) and `───` section dividers in examples.
diff --git a/src/Tool.js b/src/Tool.js
index 31de367..267ed3a 100644
--- a/src/Tool.js
+++ b/src/Tool.js
@@ -21,7 +21,7 @@
  * Create a tool from a definition.
  * Returns { spec, invoke } where spec is the wire-format object sent to the LLM.
  */
-export function defineTool({ name, description, parameters, strict = true, invoke }) {
+export function defineTool({ name, description, parameters, strict = false, invoke }) {
     if (!name) throw new Error('Tool must have a name');
     if (typeof invoke !== 'function') throw new Error(`Tool "${name}" must have an invoke function`);