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refactor(core): simplify system context into a belief model (#34917)

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Kit Langton 2026-07-02 09:32:35 -04:00 • committed by GitHub
commit 4045041554
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40 changed files with 914 additions and 805 deletions
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49
packages/core/src/mcp/guidance.ts
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@ -14,16 +14,40 @@ const Summary = Schema.Struct({
})
type Summary = typeof Summary.Type
const entries = (servers: ReadonlyArray<Summary>) =>
servers.flatMap((server) => [
` <server name="${server.server}">`,
...server.instructions.split("\n").map((line) => ` ${line}`),
" </server>",
])
const render = (servers: ReadonlyArray<Summary>) =>
[
"<mcp_instructions>",
...servers.flatMap((server) => [
` <server name="${server.server}">`,
...server.instructions.split("\n").map((line) => ` ${line}`),
" </server>",
]),
"</mcp_instructions>",
["<mcp_instructions>", ...entries(servers), "</mcp_instructions>"].join("\n")
const update = (previous: ReadonlyArray<Summary>, current: ReadonlyArray<Summary>) => {
const diff = SystemContext.diffByKey(
previous,
current,
(server) => server.server,
(before, after) => before.instructions !== after.instructions,
)
// Additions and removals render as small deltas; anything else restates the full list.
if (diff.changed.length > 0 || (diff.added.length === 0 && diff.removed.length === 0))
return [
"The available MCP server instructions have changed. This list supersedes the previous one.",
render(current),
].join("\n")
return [
...(diff.added.length === 0
? []
: ["New MCP server instructions are available in addition to those previously listed:", ...entries(diff.added)]),
...(diff.removed.length === 0
? []
: [
`Instructions for the following MCP servers are no longer available: ${diff.removed.map((server) => server.server).join(", ")}.`,
]),
].join("\n")
}
export interface Interface {
readonly load: (agent: AgentV2.Selection) => Effect.Effect<SystemContext.SystemContext>
@ -50,7 +74,8 @@ export const layer = Layer.effect(
return (
owned.length === 0 ||
owned.some(
(tool) => PermissionV2.evaluate(McpTool.name(tool.server, tool.name), "*", agent.permissions).effect !== "deny",
(tool) =>
PermissionV2.evaluate(McpTool.name(tool.server, tool.name), "*", agent.permissions).effect !== "deny",
)
)
})
@ -61,11 +86,7 @@ export const layer = Layer.effect(
codec: Schema.toCodecJson(Schema.Array(Summary)),
load: Effect.succeed(visible),
baseline: render,
update: (_previous, current) =>
[
"The available MCP server instructions have changed. This list supersedes the previous one.",
render(current),
].join("\n"),
update,
removed: () => "MCP server instructions are no longer available.",
})
}),