Amr Gharbeia
04c219468d
Level 2: symbolic-time-memory skill - memory-objects-since(timestamp) — hash-table walk, objects with version >= timestamp - memory-objects-in-range(since until) — version between two timestamps - context-query-with-time — extended query with :since :until - 6 tests, 100% pass Level 3: sensor-time skill - format-time-for-llm — TIME: section for system prompt (iso/natural format) - session-duration — session start tracking - sensor-time-tick — deadline scanning, cron-registered, 0 LLM tokens - TIME_AWARENESS / TIME_FORMAT / DEADLINE_WARNING_MINUTES env vars - 13 tests, 100% pass Level 1: TIME injection in think() (core-reason) - fboundp-guarded call to format-time-for-llm - session duration included when sensor-time skill loaded - Injected at top of system prompt in both token-economics and fallback paths Full suite: 135/135 (100%)
262 lines
11 KiB
Org Mode
262 lines
11 KiB
Org Mode
#+TITLE: Token Economics — caching, budget, and cost wiring
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#+AUTHOR: Agent
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#+FILETAGS: :token-economics:budget:caching:
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#+PROPERTY: header-args:lisp :tangle ../lisp/token-economics.lisp
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* Architectural Intent
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Token economics transforms the architecture's theoretical cost advantage into
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operational reality. Three subsystems work together:
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1. ~Prompt prefix caching~ — the IDENTITY+TOOLS portion of the system prompt
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is static across calls (changes only on skill load or identity config).
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Hashing and caching it avoids retransmitting ~500-1500 tokens per call.
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2. ~Incremental context assembly~ — the CONTEXT section is only regenerated
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when the foveal focus, scope, or memory state changes. Heartbeat ticks
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and tool-output feedback produce no context change, so assembly is skipped,
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saving ~200-800 tokens per heartbeat.
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3. ~Token budget enforcement~ — when the total prompt exceeds
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~CONTEXT_MAX_TOKENS~ (default 16384), the system progressively trims
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less-essential sections (logs first, then standing mandates, then
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peripheral context).
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These functions are called from ~think()~ via ~fboundp~ guards, keeping
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core-reason thin while enabling token economics as a hot-loadable skill.
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Depends on: tokenizer.lisp, cost-tracker.lisp
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** Contract
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1. (prompt-prefix-cached assistant-name feedback mandates-text tool-belt):
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Build the IDENTITY+TOOLS system prompt prefix. Uses ~sxhash~ on the inputs
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to detect changes. Returns the cached string when unchanged.
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2. (context-assemble-cached context sensor): Incrementally assemble awareness
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context. Skips assembly entirely for ~:heartbeat~ / ~:delegation~ sensors.
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Returns cached context when foveal-id, scope, and memory timestamp are
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unchanged. Falls back to ~[Awareness skill not loaded]~ when
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~context-assemble-global-awareness~ is not ~fboundp~.
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3. (enforce-token-budget prefix ctxt logs user prompt mandates &optional max):
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Enforce per-call token budget via progressive trimming:
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L1: truncate logs to last 5 lines
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L2: drop standing mandates
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L3: downgrade context to single-line summary
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Returns (values trimmed-prefix trimmed-ctxt trimmed-logs trimmed-user trimmed-mandates).
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4. (token-economics-initialize): zeroes the cache state at daemon boot.
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* Implementation
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** Package context
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#+begin_src lisp
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(in-package :passepartout)
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#+end_src
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** Cache state
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#+begin_src lisp
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(defvar *prompt-prefix-cache* (cons nil "")
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"Prompt prefix cache: (sxhash . cached-string). Rebuilt when IDENTITY or TOOLS change.")
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(defvar *context-cache* (list :foveal-id nil :scope nil :memory-timestamp 0 :rendered "")
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"Context assembly cache: metadata + last rendered context string.")
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#+end_src
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** Contract 1: prompt prefix caching
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#+begin_src lisp
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(defun prompt-prefix-cached (assistant-name feedback mandates-text tool-belt)
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"Build the static IDENTITY+TOOLS system prompt prefix.
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Uses sxhash on inputs to detect changes; returns cached string on cache hit."
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(let* ((hash-key (sxhash (list assistant-name feedback mandates-text tool-belt)))
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(cached-hash (car *prompt-prefix-cache*))
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(cached-str (cdr *prompt-prefix-cache*)))
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(if (and cached-str (> (length cached-str) 0) (= hash-key cached-hash))
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cached-str
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(let ((new-prefix (format nil "IDENTITY: ~a~a~a~%~%TOOLS:~%~a"
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assistant-name feedback
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(if (and mandates-text (> (length mandates-text) 0))
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(concatenate 'string (string #\Newline) mandates-text)
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"")
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tool-belt)))
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(setf (car *prompt-prefix-cache*) hash-key
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(cdr *prompt-prefix-cache*) new-prefix)
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new-prefix))))
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#+end_src
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** Contract 2: incremental context assembly
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#+begin_src lisp
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(defun context-assemble-cached (context sensor)
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"Incrementally assemble awareness context.
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Skips assembly for heartbeat/delegation sensors.
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Uses cache when foveal, scope, and memory timestamp are unchanged."
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(when (member sensor '(:heartbeat :delegation))
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(return-from context-assemble-cached nil))
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(unless (fboundp 'context-assemble-global-awareness)
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(return-from context-assemble-cached "[Awareness skill not loaded]"))
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(let* ((foveal-id (getf context :foveal-focus))
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(scope (if (and (boundp '*scope-resolver*)
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*scope-resolver*)
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(funcall *scope-resolver*)
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nil))
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(mem-ts (hash-table-count *memory-store*))
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(cache-foveal (getf *context-cache* :foveal-id))
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(cache-scope (getf *context-cache* :scope))
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(cache-ts (getf *context-cache* :memory-timestamp))
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(cache-rendered (getf *context-cache* :rendered)))
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(if (and (equal foveal-id cache-foveal)
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(eq scope cache-scope)
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(= mem-ts cache-ts)
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cache-rendered
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(> (length cache-rendered) 0))
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cache-rendered
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(let ((rendered (funcall (symbol-function 'context-assemble-global-awareness))))
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(setf (getf *context-cache* :foveal-id) foveal-id
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(getf *context-cache* :scope) scope
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(getf *context-cache* :memory-timestamp) mem-ts
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(getf *context-cache* :rendered) rendered)
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rendered))))
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#+end_src
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** Contract 3: token budget enforcement
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#+begin_src lisp
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(defun enforce-token-budget (prefix context-text logs-text user-prompt mandates-text
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&optional (max-tokens nil))
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"Enforce per-call token budget via progressive trimming.
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Returns (values prefix context-text logs-text user-prompt mandates-text)
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with trimmed sections."
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(let ((max (or max-tokens
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(ignore-errors
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(parse-integer (uiop:getenv "CONTEXT_MAX_TOKENS")))
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16384)))
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(labels ((ct (s) (funcall (symbol-function 'count-tokens) s))
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(total-tokens (p c l u m)
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(+ (ct p)
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(if c (ct c) 0)
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(ct l)
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(ct u)
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(if m (ct m) 0))))
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(let ((total (total-tokens prefix context-text logs-text user-prompt mandates-text)))
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(when (> total max)
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(log-message "TOKEN BUDGET: ~d tokens exceeds max ~d, trimming..."
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total max)
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;; L1: truncate logs to last 5 lines
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(let* ((log-lines (uiop:split-string logs-text :separator '(#\Newline)))
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(trimmed (if (> (length log-lines) 5)
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(format nil "~{~a~^~%~}" (last log-lines 5))
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logs-text)))
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(setf total (total-tokens prefix context-text trimmed user-prompt mandates-text)
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logs-text trimmed)
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(when (> total max)
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;; L2: drop standing mandates
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(setf total (total-tokens prefix context-text logs-text user-prompt nil)
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mandates-text nil)
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(when (> total max)
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;; L3: downgrade context to summary
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(let ((ctxt-lines (uiop:split-string (or context-text "") :separator '(#\Newline))))
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(setf context-text
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(format nil "[Context trimmed: ~d items]" (length ctxt-lines)))))))))
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(values prefix context-text logs-text user-prompt mandates-text))))
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#+end_src
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** Contract 4: initialization
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#+begin_src lisp
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(defun token-economics-initialize ()
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"Zero cache state at daemon boot."
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(setf (car *prompt-prefix-cache*) nil
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(cdr *prompt-prefix-cache*) ""
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(getf *context-cache* :foveal-id) nil
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(getf *context-cache* :scope) nil
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(getf *context-cache* :memory-timestamp) 0
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(getf *context-cache* :rendered) ""))
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#+end_src
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* Test Suite
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#+begin_src lisp
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(ql:quickload :fiveam :silent t))
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(defpackage :passepartout-token-economics-tests
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(:use :cl :fiveam :passepartout)
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(:export #:token-economics-suite))
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(in-package :passepartout-token-economics-tests)
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(def-suite token-economics-suite
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:description "Prompt prefix caching, incremental context, token budget")
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(in-suite token-economics-suite)
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(test test-prompt-prefix-cached-builds
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"Contract 1: prompt-prefix-cached returns a string containing IDENTITY."
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(setf (car passepartout::*prompt-prefix-cache*) nil
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(cdr passepartout::*prompt-prefix-cache*) "")
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(let ((prefix (passepartout::prompt-prefix-cached "Agent" "" nil "No tools")))
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(is (stringp prefix))
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(is (search "IDENTITY" prefix))
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(is (search "TOOLS" prefix))))
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(test test-prompt-prefix-cached-hits
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"Contract 1: second call with same inputs returns cached result."
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(setf (car passepartout::*prompt-prefix-cache*) nil
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(cdr passepartout::*prompt-prefix-cache*) "")
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(let ((p1 (passepartout::prompt-prefix-cached "Agent" "" nil "No tools"))
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(p2 (passepartout::prompt-prefix-cached "Agent" "" nil "No tools")))
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(is (string= p1 p2))))
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(test test-prompt-prefix-cached-miss
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"Contract 1: different inputs rebuild the cache."
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(setf (car passepartout::*prompt-prefix-cache*) nil
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(cdr passepartout::*prompt-prefix-cache*) "")
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(let ((p1 (passepartout::prompt-prefix-cached "Agent" "" nil "No tools"))
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(p2 (passepartout::prompt-prefix-cached "Bot" "" nil "No tools")))
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(is (not (string= p1 p2)))
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(is (search "Bot" p2))))
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(test test-context-assemble-cached-skips-heartbeat
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"Contract 2: heartbeat sensors skip context assembly, return nil."
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(let ((result (passepartout::context-assemble-cached
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'(:foveal-focus "id1") :heartbeat)))
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(is (null result))))
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(test test-context-assemble-cached-skips-delegation
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"Contract 2: delegation sensors also skip assembly."
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(let ((result (passepartout::context-assemble-cached
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'(:foveal-focus "id1") :delegation)))
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(is (null result))))
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(test test-context-assemble-cached-non-skip
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"Contract 2: user-input sensors attempt assembly (fails gracefully without awareness)."
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(let ((result (passepartout::context-assemble-cached
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'(:foveal-focus "id1") :user-input)))
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(is (stringp result))
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(is (> (length result) 0))))
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(test test-enforce-token-budget-passthrough
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"Contract 3: under-budget prompts pass through unchanged."
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(multiple-value-bind (p c l u m)
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(passepartout::enforce-token-budget "hi" "ctxt" "log" "user" nil 100000)
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(is (string= "hi" p))
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(is (string= "ctxt" c))
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(is (string= "log" l))
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(is (string= "user" u))
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(is (null m))))
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(test test-enforce-token-budget-trims
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"Contract 3: over-budget prompts get trimmed."
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(let ((big-prefix (make-string 20000 :initial-element #\x)))
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(multiple-value-bind (p c l u m)
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(passepartout::enforce-token-budget big-prefix "ctxt" "logs\nlogs\nlogs\nlogs\nlogs\nlogs\nlogs" "user" nil 10)
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(declare (ignore p l u m))
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;; The prefix itself exceeds the tiny 10-token budget, so everything gets trimmed
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(is (or (stringp c) (null c)))
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(is (search "[Context trimmed" (or c ""))))))
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(test test-token-economics-initialize
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"Contract 4: initialize zeroes all cache state."
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(setf (car passepartout::*prompt-prefix-cache*) 12345
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(cdr passepartout::*prompt-prefix-cache*) "stale")
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(setf (getf passepartout::*context-cache* :rendered) "stale context")
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(passepartout::token-economics-initialize)
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(is (null (car passepartout::*prompt-prefix-cache*)))
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(is (string= "" (cdr passepartout::*prompt-prefix-cache*)))
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(is (string= "" (getf passepartout::*context-cache* :rendered))))
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#+end_src
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