Struct PromptLogEntry 

pub struct PromptLogEntry {
    pub timestamp: DateTime<Utc>,
    pub hook_type: String,
    pub injection_kind: String,
    pub palace: String,
    pub trigger_prompt: String,
    pub injection: String,
    pub injection_length: usize,
    pub palace_facts_count: Option<usize>,
    pub unread_messages_count: Option<usize>,
    pub duration_ms: u64,
}

One enriched-prompt log entry — written as a single JSONL line.

Why: the consumer is a human running jq over a day’s worth of injections to grade signal-vs-noise. Stable field names, RFC-3339 timestamps, and numeric byte/duration counts keep the analysis script trivial. What: tagged by injection_kind. palace_facts_count is filled for prompt-context-facts; unread_messages_count for inbox-check-messages. Both default to None so the JSON shape stays compact for entries that only have one of the two. Test: single_event_roundtrip writes one entry and parses it back.

Fields

timestamp: DateTime<Utc>

RFC-3339 UTC timestamp set at the moment the entry is built.

hook_type: String

"UserPromptSubmit" or "SessionStart".

injection_kind: String

"prompt-context-facts" or "inbox-check-messages".

palace: String

Palace id the injection was scoped to.

trigger_prompt: String

Hook stdin verbatim; replaced with "sha256:<hex>" when hash_prompts = true in the active config.

injection: String

Hook stdout (the actual injection sent to Claude Code) verbatim.

injection_length: usize

Byte length of injection.

palace_facts_count: Option<usize>

Number of facts in the prompt-context injection, when applicable.

unread_messages_count: Option<usize>

Number of unread messages in the inbox-check injection, when applicable.

duration_ms: u64

Wall-clock duration of the invocation, in milliseconds.

Implementations

impl PromptLogEntry

pub fn new( hook_type: impl Into<String>, injection_kind: impl Into<String>, palace: impl Into<String>, trigger_prompt: impl Into<String>, injection: impl Into<String>, ) -> Self

Construct a new entry stamped with the current UTC time.

Why: the hook caller has the raw fields handy but should not carry chrono in its imports. This helper builds an entry with timestamp auto-populated and zero-initialised optional counts. What: sets timestamp = Utc::now() and copies the supplied fields. Test: single_event_roundtrip.

pub fn with_duration_ms(self, ms: u64) -> Self

Builder: set the duration this hook invocation took.

pub fn with_palace_facts_count(self, n: usize) -> Self

Builder: attach the palace-facts count (prompt-context only).

pub fn with_unread_messages_count(self, n: usize) -> Self

Builder: attach the unread-messages count (inbox-check only).

Trait Implementations

impl Clone for PromptLogEntry

fn clone(&self) -> PromptLogEntry

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PromptLogEntry

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PromptLogEntry

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for PromptLogEntry

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.