fix(evi): drop the linear mcp connection and raise the session limits

AGENTS.md

@@ -71,6 +71,7 @@ scripts/                   Repo tooling (run-app, cli-sandbox, release-notes)
 - **No gratuitous defensive code.** Don't add try/catch, null checks, or input validation the surrounding file doesn't have — especially on paths already validated upstream. Match the file's level of paranoia.
 - **No silent fallbacks.** No empty `catch`, no `?? default` that masks a bug, no `as any` to silence TypeScript. If something can fail, let it fail loudly or handle it explicitly.
 - **Comments are rare and earn their place.** Only for constraints the code can't express (a protocol quirk, a deliberate perf trade-off). Never paraphrase the code, never narrate a change. When in doubt: no comment.
+- **A comment states a durable constraint, not the moment you wrote it.** One or two lines. No issue ids, no measurements, no before/after story, no "I found that…" — that belongs in the PR body, the changeset, or a doc. Code outlives the task that produced it; a paragraph pinned to last Tuesday's investigation reads as noise six months later and nobody dares delete it.
 - **This extends to all prose**: test names, error/log messages, changeset descriptions, PR bodies. Factual and plain — no emoji, no superlatives, no filler.
 - **No speculative code.** No unrequested options or parameters, no "just in case" branches, no keeping the old code path alongside the new one. Delete dead code; public API deprecations are a maintainer decision — ask first.
 - **Prefer deleting and simplifying over working around.** If the fix needs a workaround, question the design before adding the workaround.

apps/evi/agent/agent.ts

@@ -19,9 +19,10 @@ export default defineAgent({
   }),
   /** This model honors only `high` and `xhigh`. */
   reasoning: 'high',
+  /** Bounds a runaway session, not cost: one real thread runs a few million in. */
   limits: {
-    maxInputTokensPerSession: 5_000_000,
-    maxOutputTokensPerSession: 100_000,
+    maxInputTokensPerSession: 20_000_000,
+    maxOutputTokensPerSession: 250_000,
   },
   modelOptions: {
     providerOptions: { gateway: { ...gatewayRouting, tags: sessionTags() } },

apps/evi/agent/lib/channel.ts

@@ -1,9 +1,6 @@
 /**
- * The channel name eve reports, without its prefix.
- *
- * Framework channels arrive bare (`http`, `schedule`, `subagent`); authored ones
- * as `channel:<filename>`, so `agent/channels/github.ts` is `channel:github`.
- * Comparing against the bare name without stripping never matches.
+ * The channel name eve reports, without its prefix. Framework channels arrive
+ * bare (`http`, `schedule`); authored ones as `channel:<filename>`.
  */
 export function channelName(kind?: string): string {
   return (kind ?? 'unknown').replace(/^channel:/, '')

apps/evi/agent/lib/environment.ts

@@ -1,9 +1,7 @@
 /**
- * Where this process is running, as one label.
- *
- * Shared by the gateway spend tags and the evlog wide events so a run that bills
- * as `eval` also logs as `eval`. `EVE_RUN_MODE` is set by the `eval` script; it
- * does not reach a deployment behind `eve eval --url`.
+ * Where this process is running. Shared by the gateway spend tags and the evlog
+ * wide events so both label a run the same way. `EVE_RUN_MODE` comes from the
+ * `eval` script and does not reach a deployment behind `eve eval --url`.
  */
 export function environment(): string {
   if (process.env.EVE_RUN_MODE === 'eval') return 'eval'

apps/evi/agent/lib/gateway.ts

@@ -8,10 +8,8 @@ export const gatewayRouting = {
 } as const
 
 /**
- * Tags stamped on every gateway request, read back through the spend report.
- *
- * One tag per dimension, not one compound string: the report groups by a single
- * dimension at a time, so this yields a row per environment and a row per surface.
+ * Tags stamped on every gateway request. One tag per dimension, not a compound
+ * string: the spend report groups by a single dimension at a time.
  */
 export function sessionTags(kind?: string): string[] {
   return [`evi:env:${environment()}`, `evi:surface:${channelName(kind)}`]

apps/evi/docs/notes.md

@@ -76,6 +76,15 @@ Because app-scoped is non-interactive, eve never emits a challenge:
 anyone can approve, on every turn. User-scoped at least fails loudly with
 `principal_required`.
 
+**A misconfigured OAuth connection does not degrade, it breaks the whole run.**
+On EVL-213, the Linear MCP connection took every GitHub tool down with it: five
+calls, all `Cannot read properties of undefined (reading 'toLowerCase')`, thrown
+from `isProvisionableConnectorUid` in
+`@vercel/connect/dist/eve/provision-oauth-connector.js`. Local evals never saw it
+because `provisionEveOAuthConnector` returns early without an OIDC token; in
+production it runs. The connection is removed until Connect can mint the token —
+assuming the agent simply answers without that connection is wrong.
+
 **`vercel connect token` from the CLI proves nothing about app-scoped auth** — it
 resolves through your own Vercel identity, the user-scoped path.