diff --git a/AGENTS.md b/AGENTS.md
index ade1677..6c3eb99 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -32,7 +32,9 @@ Review the codebase with focus on:
 - Treat the wiki as the primary place for large design ideas, architectural drafts, and framework backlog notes.
 - If the agent identifies a substantial new concept or design direction, such as scenes, callback agents, a webhook model, or another framework-level abstraction, the agent must ask the user whether it should also formalize that idea as a draft wiki page.
 - When the user agrees, prefer paired wiki pages such as `Page.md` and `Page-RU.md`, and clearly mark draft design pages with `DRAFT` when the API is not implemented or not yet stable.
-- Keep `TODO.md`, the wiki backlog pages, and `CHANGELOG.md` aligned when framework-level items move between planned and completed states.
+- Keep `TODO.md`, the wiki backlog pages, and `CHANGELOG.md` aligned when framework-level items move between planned and completed states in the main repository.
+- Wiki-only edits must never be added to `CHANGELOG.md`.
+- `AGENTS.md`-only edits must never be added to `CHANGELOG.md`.
 
 ## Go review expectations
 Check for:
@@ -90,7 +92,8 @@ Prefer the repository’s documented commands. If multiple choices exist, use th
 
 ## Versioning and changelog
 - After every code or documentation change in the main repository, update `CHANGELOG.md`.
-- Changes made only inside the `.wiki/` repository do not require a `CHANGELOG.md` update.
+- Changes made only inside the `.wiki/` repository must not be added to `CHANGELOG.md`.
+- Changes made only in `AGENTS.md` must not be added to `CHANGELOG.md`.
 - Add changes only to the section for the next version after the latest published git tag.
 - The agent must check the latest published tag, `CHANGELOG.md`, and `utils/version.go` before editing the changelog.
 - The agent must verify that the target changelog version matches the version declared in `utils/version.go`.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f87692..e24150d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## v1.0.0-rc.14
+
+### Changed
+- Added missing godoc for the exported observer `Event` marker interface.
+
 ## v1.0.0-rc.13
 
 ### Added
diff --git a/TODO.md b/TODO.md
index ec11cf8..44cd369 100644
--- a/TODO.md
+++ b/TODO.md
@@ -12,8 +12,8 @@ Russian page:
 
 Current priority split:
 
-- `Priority 2`: service layer and dependency graph model.
-- `Partial`: webhook runtime model, plugin composition contract.
+- `Partial`: webhook runtime model.
+- `Ideas`: service layer and dependency graph model, plugin composition contract.
 
 Completed former high-priority items:
 
diff --git a/observer.go b/observer.go
index 65fd4e3..d5df215 100644
--- a/observer.go
+++ b/observer.go
@@ -32,6 +32,7 @@ const (
 	HandlerSceneMessageKind HandlerEventKind = "scene_message"
 )
 
+// Event is the marker interface implemented by all observer runtime events.
 type Event interface {
 	isEvent()
 }
diff --git a/plugins.go b/plugins.go
index f988580..e61a223 100644
--- a/plugins.go
+++ b/plugins.go
@@ -18,7 +18,7 @@ const (
 	CommandValueStringType CommandValueType = "string"
 	// CommandValueIntType expects a decimal integer (digits only).
 	CommandValueIntType CommandValueType = "int"
-	// CommandValueBoolType is reserved for future use (not implemented).
+	// CommandValueBoolType expects a exact "true" or "false".
 	CommandValueBoolType CommandValueType = "bool"
 	// CommandValueAnyType accepts any input without validation.
 	CommandValueAnyType CommandValueType = "any"
@@ -193,6 +193,12 @@ func NewPlugin[T AppData](name string) *Plugin[T] {
 // AddCommand registers a command in the plugin.
 // The command's .command field is used as the key.
 func (p *Plugin[T]) AddCommand(command *Command[T]) *Plugin[T] {
+	if command == nil {
+		if p.logger != nil {
+			p.logger.Warnln("trying to add nil command")
+		}
+		return p
+	}
 	p.commands[command.command] = command
 	return p
 }
@@ -208,6 +214,12 @@ func (p *Plugin[T]) NewCommand(exec CommandExecutor[T], command string, args ...
 // AddPayload registers a payload (e.g., callback query data) in the plugin.
 // Payloads are triggered by inline button callback_data, not by message text.
 func (p *Plugin[T]) AddPayload(command *Command[T]) *Plugin[T] {
+	if command == nil {
+		if p.logger != nil {
+			p.logger.Warnln("trying to add nil command")
+		}
+		return p
+	}
 	p.payloads[command.command] = command
 	return p
 }
diff --git a/tgapi/api.go b/tgapi/api.go
index e5ec1e9..79ceddd 100644
--- a/tgapi/api.go
+++ b/tgapi/api.go
@@ -98,6 +98,11 @@ type API struct {
 // Always call Close() when done to release resources.
 func NewAPI(opts *APIOpts) *API {
 	l := utils.CreateLogger("API", utils.GetLoggerLevel())
+	if opts == nil {
+		l.Errorln("Set API options")
+		_ = l.Close()
+		return nil
+	}
 
 	client := opts.client
 	if client == nil {
diff --git a/tgapi/uploader_api.go b/tgapi/uploader_api.go
index 5012160..9f812c1 100644
--- a/tgapi/uploader_api.go
+++ b/tgapi/uploader_api.go
@@ -71,6 +71,11 @@ type Uploader struct {
 // NewUploader creates a multipart uploader bound to an API client.
 func NewUploader(api *API) *Uploader {
 	logger := utils.CreateLogger("UPLOADER", utils.GetLoggerLevel())
+	if api == nil {
+		logger.Errorln("api is nil")
+		_ = logger.Close()
+		return nil
+	}
 	return &Uploader{api, logger}
 }
 
diff --git a/utils/version.go b/utils/version.go
index 40e5010..22bdb51 100644
--- a/utils/version.go
+++ b/utils/version.go
@@ -2,7 +2,7 @@ package utils
 
 const (
 	// VersionString is the module version string.
-	VersionString = "1.0.0-rc.13"
+	VersionString = "1.0.0-rc.14"
 	// VersionMajor is the module major version.
 	VersionMajor = 1
 	// VersionMinor is the module minor version.
@@ -10,5 +10,5 @@ const (
 	// VersionPatch is the module patch version.
 	VersionPatch = 0
 	// VersionBeta is the prerelease counter for the current version.
-	VersionBeta = 13
+	VersionBeta = 14
 )