Context and Continuity

Agent objective

Produce an agent that survives long tasks without losing key findings — correct windowing configuration, explicit checkpoint tool usage, and cross-session memory where needed.

When to load this skill

• Task is long-running (10+ iterations expected)
• Agent must preserve intermediate results across context pressure events
• Agent needs to resume work across sessions
• Task involves accumulating findings that must survive to the final answer

Implementation baseline

const agent = await ReactiveAgents.create()
  .withProvider("anthropic")
  .withReasoning({ defaultStrategy: "adaptive", maxIterations: 20 })
  .withTools({
    allowedTools: ["web-search", "file-read", "checkpoint", "recall", "find"],
  })
  .withMemory({ tier: "enhanced", dbPath: "./agent.db" })
  .withSystemPrompt(`
    You are a research assistant.
    Use the checkpoint tool to save key findings before moving on.
    Call checkpoint() with no args to review what you've saved.
  `)
  .build();

Key patterns

Using the checkpoint tool

The checkpoint tool has three modes:

// SAVE — persist a named finding
checkpoint("api-endpoints", "Found: /users, /orders, /products at base URL https://api.example.com")

// RETRIEVE — get a saved finding by name
checkpoint("api-endpoints")

// LIST — show all saved checkpoints
checkpoint()

Instruct the agent explicitly in the system prompt:

.withSystemPrompt(`
  After each major discovery, call checkpoint(label, content) to save it.
  Before writing your final answer, call checkpoint() to review all saved findings.
  Never rely on context alone for facts you found more than 3 steps ago.
`)

Context pressure thresholds

The kernel auto-checkpoints and applies message windowing based on token utilization:

Tier	Hard gate	Auto-checkpoint fires at
local	80%	75%
mid	85%	80%
large	90%	85%
frontier	95%	90%

Auto-checkpoint captures successful non-meta tool observations. It is a safety net — explicit checkpoints for structured findings are better.

Cross-session memory with .withMemory()

// Within-session only (default)
.withTools({ allowedTools: ["checkpoint"] })

// Cross-session persistence — findings survive agent restarts
.withMemory({ tier: "enhanced", dbPath: "./research-memory.db" })
.withTools({ allowedTools: ["checkpoint", "recall", "find"] })
// recall — semantic search over past episodic memory
// find — exact lookup by memory key

Reducing context pressure on long tasks

// Lower maxIterations forces tighter reasoning loops
.withReasoning({ defaultStrategy: "adaptive", maxIterations: 12 })

// Use plan-execute-reflect to front-load planning and avoid re-exploring
.withReasoning({ defaultStrategy: "plan-execute-reflect", maxIterations: 15 })

Builder API reference

Method	Key params	Notes
.withTools({ allowedTools })	include "checkpoint", "recall", "find"	Checkpoint is a built-in meta-tool
.withMemory(opts?)	{ tier: "enhanced", dbPath }	Episodic + semantic memory persist across sessions
.withReasoning({ maxIterations })	number	Lower = tighter loops = less context pressure
.withSystemPrompt(s)	string	Instruct agent to use checkpoint tool proactively

Pitfalls

• Auto-checkpoint captures tool observations only — it won't save the agent's reasoning or intermediate conclusions; use explicit checkpoint(label, content) for those
• Checkpoint labels must be unique within a session — reusing a label overwrites the previous value
• .withMemory({ tier: "enhanced" }) without dbPath uses a default path; set explicitly in multi-agent environments to prevent collisions
• recall and find tools require .withMemory() — enabling them without memory configured is a no-op
• Context windowing is automatic; you cannot configure the window size directly — control pressure through iteration budget and explicit checkpointing instead