docs: refresh agent guidance

AGENTS.md

@@ -0,0 +1,25 @@
+# hermes-plugin-kit
+
+Convention-correct helper library for registering `hermes-agent` plugin tools.
+This repository is an installable Python package, not a path-loaded runtime
+plugin.
+
+## Working Rules
+
+- Keep the public API centered on `@tool`, `register_all`, and the argument
+  helpers exported from `hermes_plugin_kit`.
+- Preserve the Hermes tool schema convention: arguments live under
+  `function.parameters`, never as flattened top-level schema fields.
+- Tool handlers must accept `(args, **kwargs)` and return JSON-compatible
+  dictionaries unless deliberately returning an already-encoded string.
+- Keep validation errors instructive for model-facing callers, including the
+  missing argument name and example when available.
+- Redact secret-looking values in logs and avoid logging full untrusted payloads.
+- Use `uv` and the Makefile for local development:
+  `make install`, `make test`, `make test-one T=tests.test_kit.SchemaConventionTests`,
+  and `make build`.
+
+## Release Notes
+
+When changing conventions or exported helpers, update `README.md` examples and
+tests together so consuming Hermes plugins have a reliable migration path.

CLAUDE.md

@@ -0,0 +1 @@
+@AGENTS.md