Lens output — memory/context — run AGS-2026-08-21-SEQTHINK

Depth: brief, per SCOPE-MEM. Brief means proportionate coverage of every numbered item, not silent omission. Inspected boundary for this lens: SRC-1 (full file, 279 lines), SRC-2 (full file, 63 lines), SRC-3 (full file). Nothing outside the frozen boundary was read.

Headline. Retention is total and unmanaged; retrieval of retained content is nil. Two derived values return to a later consumer invocation — thoughtHistoryLength (a count) and branches (a key set). The branches array is the only accumulated caller-authored text that comes back, and it comes back as opaque labels with no content attached. There is no selection, no targeting, no budget, no curation, no invalidation, and no persistence past the process. Every artifact-side conclusion here is implemented; nothing in this run reaches observed or causally supported.

1. Inventory of retained operative parts

OBJ-3 is a bundled artifact under the lens's splitting rule: its key set and its bucket contents differ in consumer, in checks, and in authority path. It is split below as parts P2 and P3, and that split is returned as amendment MEM-AMD-1 rather than as a new inventory record.

Part Registered as Storage substrate Representational form Persistence Lineage Producer Consumer Invalidation / regeneration Promotion path
P1 thoughtHistory OBJ-2 V8 heap, one module-level instance (SRC-1:249), no file, no DB, no network (ABS-1) array of typed in-memory records process lifetime; unbounded, no cap append only (RTE-5, SRC-1:94) CMP-1 write path, over EXT-3-authored input only .length (SRC-1:114) → OBJ-4 none — no clear, truncate, evict, decay, or TTL exists (MEM-1); regeneration impossible, nothing is derived from a source none
P2 branches key set part of OBJ-3 same heap object's own-property names caller-authored opaque string labels process lifetime; grows monotonically with distinct branchId values create-on-first-use (RTE-6, SRC-1:97–99) EXT-3 authors the label; CMP-1 admits it unvalidated (SRC-1:53) Object.keys (SRC-1:113) → OBJ-4 → BAP-2 none (MEM-1) none — a label is never checked, normalized, deduplicated beyond object-key identity, or lifted into the schema
P3 branches bucket contents part of OBJ-3 same heap; arrays of references to P4 objects already in P1 array of typed in-memory records (aliases) process lifetime append (SRC-1:100) CMP-1 no consumer at all — no route reads a bucket's elements none (MEM-1) none
P4 retained ThoughtData record OBJ-1 heap object, single instance shared by P1 and P3 typed record: one natural-language thought string plus eight control fields process lifetime validate → mutate (RTE-4) → retain EXT-3 authors thought; CMP-1 validates four fields, casts five unchecked (SRC-1:29–56) CMP-5 render (SRC-1:104), then nothing in-place mutation of totalThoughts before retention is the artifact's only write-over of acquired data (MEM-AMD-4); no versioning, no supersession (ABS-6) none
P5 OBJ-6 stderr render OBJ-6 none — written to fd 2 and dropped ANSI text box not retained reshape-for-display CMP-5 no in-boundary consumer (BAP-3) n/a none
P6 OBJ-5 / OBJ-7 tool spec OBJ-5, OBJ-7 shipped source constant natural-language + JSON Schema shipped, immutable at runtime authored, not accumulated package authors EXT-3 via RTE-1 n/a n/a

P5 and P6 are listed for completeness and are out of scope as memory: P6 is static shipped material, which the run's definition excludes from read-back; P5 is retained by nobody. P6 is nonetheless the artifact's strongest behavioral channel (BAP-1), which is a fact about instruction, not about memory.

Checks on retained parts. RTE-3 checks four fields for JSON presence and type at the acquisition boundary and nothing thereafter. branchId and the four other optional fields are cast, not validated (SRC-1:50–54). No check of any kind runs against retained state after a write. Nothing inspects, scores, or compares a thought (ABS-3).

2. Write side separated from read-back

Write agency: automatic, unconditionally, on every accepted call. There is no manual write, no opt-in, no opt-out, no caller-visible switch, and no configuration. A caller cannot suppress retention; the only way to not be recorded is to fail validation.

Write-side function Present? Evidence / search boundary
Acquisition yes — RTE-3 boundary check, then RTE-5 append (SRC-1:29–56, 94) SRC-1 full file
Index maintenance (distinct from acquisition) yes — RTE-6 maintains branches as a secondary index over the same P4 objects, keyed by caller-supplied label; bucket created on first use (SRC-1:96–101). This is the only structure-building write SRC-1 full file
Curation absent — no selection, ranking, pruning, tagging, or editorial step of any kind SRC-1 full file: the only mutations of retained state are SRC-1:94 and SRC-1:97–100, both unconditional-or-predicated appends
Consolidation absent same boundary
Deduplication absent — identical thoughts append twice; object-key collision on branchId merges buckets but that is a hash-map property, not a dedup step same boundary
Evolution / supersession absent — isRevision/revisesThought are stored and used only to pick a stderr label (SRC-1:64–66); no prior entry is marked, replaced, or removed (ABS-6) same boundary
Synthesis / distillation absent (ABS-9) same boundary
Invalidation absent — no clear, reset, truncate, splice, pop, shift, reassignment, or delete; proposed as MEM-1 SRC-1 full file; SRC-2 full file; OBJ-7 schema (no reset parameter)
Decay / TTL / size bound absent — growth is unbounded for process lifetime (RTE-5) same boundary
Promotion to stronger form or force absent — nothing ever moves from in-memory to durable, from string to schema, or from informational to enforcing SRC-1 full file; ABS-1

Raw traces versus distilled artifacts. P1 is a pure raw trace: every accepted call, in arrival order, verbatim. There is no distilled retained artifact anywhere — the only distillation in the system (OBJ-4's two derived values) is computed at read time and never stored. P3 is a raw trace re-partitioned by label, not a distillation.

Read-back, stated exactly. Under the run's definition, read-back exists and is real: thoughtHistoryLength and branches are computed from material accumulated in earlier consumer invocations and are delivered into a later one. That a long-lived process holds them does not make them current-run state. But no retained content returns: OBJ-2 is read only for .length, OBJ-3 only for its keys, and no route returns a stored thought string (ABS-2). The content of every retained thought leaves the process exactly once, on stderr, through a channel the consuming model never reads (RTE-9, BAP-3) — which sharpens the finding rather than softening it.

Lineage labels carry no epistemic weight. append (RTE-5), create-on-first-use (RTE-6), and derive (Object.keys, .length) are lineage descriptions only. None establishes that a retained thought is true, accepted, warranted, or semantically preserved. A branchId returned in OBJ-4 is an opaque token: its reappearance says a label was used before, not that the branch it names still means anything.

3. The runtime-owned context route

There is exactly one read-back route: RTE-7 → OBJ-4, on path BAP-2.

Dimension Value Evidence
Read-back direction (receiving agent's perspective) pull, and only pull. Delivery is the return value of a call the consumer itself made. No push channel exists: the artifact cannot initiate, has no timer, callback, notification, or continuation (ABS-10), and RTE-9's stderr write goes to a party outside the consumer path (BAP-3) SRC-1:106–117, SRC-1:255–267, ABS-10
Selection signal none. The same five fields are computed the same way on every call. No query, no relevance score, no recency, no similarity, no caller-supplied selector. branchId in the request does not filter the returned key set SRC-1:109–115
Targeting none. Not addressed to a task, topic, branch, or thought range. thoughtNumber and branchId arrive in the request and steer only the write side SRC-1:106–117
Selection scope whole retained state, but only its cardinality and its key names — never its elements SRC-1:113–114, ABS-2
Budget none implemented. No token cap, item cap, or truncation. The branches array is caller-controlled and monotone: distinct branchId values accumulate without limit, so read-back payload size grows with use and never shrinks (MEM-AMD-2) SRC-1:113; MEM-1 (no invalidation)
Delivery point one MCP text content block, JSON.stringify(..., null, 2), in the tool result SRC-1:106–116
Consumption point owned by EXT-2 — where and whether the tool-result block lands in a model's context is outside the boundary EXT-2, BAP-2
Behavioral-faithfulness test absent. Nothing checks that the returned count or key set corresponds to anything the consumer believes; nothing verifies the consumer used them (ABS-3) SRC-1 full file
Post-turn capture / consolidation RTE-5/RTE-6 are write-side maintenance on the same synchronous call, not a second read-back point. There is no second read-back point SRC-1:86–130

Two read-back defects follow, returned as amendments: the branches field is verbatim accumulated caller text rather than a summary and is unbounded (MEM-AMD-2); thoughtHistoryLength is a process-lifetime counter of accepted calls, not a measure of the current thinking sequence (MEM-AMD-3).

4. Presence, wiring, activation, causal effect — four separate findings

Finding Status Evidence Boundary and the conclusion it prevents
Context presence (artifact side). RTE-7 assembles OBJ-4 into an MCP content block on every successful call; RTE-1 returns OBJ-5/OBJ-7 verbatim to a tool-list request implemented SRC-1:106–117, SRC-1:251–253 SRC-1 full file. Prevents nothing about the artifact; establishes only that the material is emitted, not that it enters any context
Context presence (consumer side). Whether OBJ-4 or OBJ-5 reaches a model's context window uninspected — EXT-2 is uninspected and owns tool-list injection and transcript assembly. Prevents any claim that read-back material is present to a model
Deployed wiring. A claude_desktop_config.json entry launching the server via npx claimed — doctrine only SRC-2:43–59 Register gap: no host configuration inspected, no npm tarball inspected. Prevents any claim that this server is deployed anywhere in the field
Activation. Evidence that delivered material changed EXT-3's behavior uninspected (explicitly not absent) — No tests, fixtures, logs, or traces exist in the subtree or repo root (ABS-4). Prevents any observed status. The artifact affords no activation evidence either: it records nothing about what the caller did with OBJ-4
Causal effect. That read-back caused a behavior change uninspected — ABS-4, plus absence of any experiment in the register. Prevents every causally supported status this run could otherwise reach

No upgrade is made anywhere: emission is not presence, presence is not activation, implemented is not observed, and the doctrine's configuration example is not deployment.

5. Behavioral authority for the memory paths

Authority is reported in four parts; the family label is not a substitute for them.

Path Consumer Channel Force Horizon
BAP-2 (the read-back path) EXT-2, and through it EXT-3 OBJ-4 in the tool result informational — no directive content, no enforcement, no consequence for ignoring it the single call that produced it, plus whatever transcript retention EXT-2 applies
BAP-3 (the content-egress path) none inside the boundary OBJ-6 on fd 2 none implemented process lifetime
BAP-4 (the acquisition gate) EXT-2's argument construction, then RTE-3 OBJ-7 JSON Schema enforcing on argument shape for four required fields; silent on the other five as BAP-1

Note on horizons, which differ and must not be collapsed: the delivery horizon of BAP-2 is one call, while the material's accumulation horizon is the whole process lifetime (ABS-1, ABS-5). A consumer reading OBJ-4 at call n is being handed a value shaped by every call since process start, including calls from earlier, unrelated thinking episodes.

Epistemic and operational authority stay separate here and both are weak on the memory paths. BAP-2 licenses no content (it returns a count and a label list, neither asserting anything about the world) and permits or blocks no behavior (ABS-10 — the artifact does not pace or terminate the loop; nextThoughtNeeded is echoed unchanged). The artifact's only strong authority is BAP-1, an instruction channel, which is not memory.

Proposals (MEM-n)

MEM-1 — evidenced absence: no invalidation, reset, or clear operation for retained state. Identity: an absence over the state mutators of SequentialThinkingServer in /home/zby/llm/servers/src/sequentialthinking/index.ts, symbols thoughtHistory (declared SRC-1:26) and branches (declared SRC-1:27). Recorded search boundary: SRC-1 full file — every occurrence of both symbols enumerated (thoughtHistory: 26, 94, 114; branches: 27, 97, 98, 100, 113); every one is an initializer, an append, a bucket create, or a derived read. No delete, splice, pop, shift, length = 0, or reassignment exists. Plus SRC-2 full file (no documented reset) and OBJ-7 (SRC-1:189–234, no reset or session parameter). Status: absent. Conclusion it supports: the only way to drop retained state is process termination, so retention duration is entirely EXT-2's launch decision, not the artifact's. Conclusion it prevents: any claim that a caller, a session boundary, or the artifact itself can bound, scope, or expire what has accumulated. Distinct from ABS-1 (no durable persistence), ABS-5 (no per-session isolation), and ABS-6 (no revision applied to history), none of which state the absence of a discard path.

Corrections (MEM-CORR-n)

MEM-CORR-1 — ABS-2's recorded search boundary is misstated at the scope given; the absence itself stands. ABS-2 states its boundary as "every read of thoughtHistory/branches enumerated (SRC-1:113–114)", and the OBJ-3 row says it is "read only for Object.keys (SRC-1:113)". branches is in fact also read on the write side, twice: SRC-1:97 (if (!this.branches[validatedInput.branchId]), an existence check that decides whether to create a bucket) and SRC-1:100 (this.branches[validatedInput.branchId].push(...), resolving the bucket reference to append into). Evidence anchor: SRC-1:96–101. What survives: the absence claim is true — neither read retrieves a stored thought, and no route returns retained content. What is defective: the enumeration is incomplete and the word "only" overstates it, which matters because it hides the artifact's single instance of retained state feeding a control decision (index maintenance, item 2 above). Correction, not re-inventory: ABS-2 and the OBJ-3 row should read "read for content by nothing; read on the write side at SRC-1:97,100 for bucket existence and resolution; read for derivation at SRC-1:113–114."

Amendments (MEM-AMD-n)

MEM-AMD-1 — OBJ-3 bundles two parts with different consumers, checks, and authority paths. The key set of branches is consumed by RTE-7 and travels BAP-2 to EXT-3; the bucket contents have no consumer anywhere in the boundary. Under the lens's splitting criterion (consumer and authority path differ) they are separate retained parts, inventoried above as P2 and P3. Evidence anchor: SRC-1:113 (keys read) versus SRC-1:96–101 (buckets written, never read for elements). Superseded value: none — OBJ-3's single-row description is amended, not replaced.

MEM-AMD-2 — the branches field of OBJ-4 is verbatim accumulated caller text, not a derived summary, and is unbounded. RTE-7 describes branches as one of "two values derived from retained state". The derivation is in selection only (keys, not values); the tokens returned are the exact strings EXT-3 supplied on earlier calls, admitted without validation (SRC-1:53). This makes it the only accumulated caller-authored text that ever returns to a consumer, which is the memory lens's central positive finding. Second part: the array has no cap and no discard path (MEM-1), so it grows monotonically with the number of distinct branchId values used in the process and never shrinks. Evidence anchor: SRC-1:53, SRC-1:113. Superseded value: the "derived" characterization in the RTE-7 progression field.

MEM-AMD-3 — thoughtHistoryLength is a process-lifetime counter of accepted calls, not a measure of the current thinking sequence. It is this.thoughtHistory.length (SRC-1:114) over an array that receives an unconditional append per accepted call (SRC-1:94), including revision thoughts and branch thoughts. It never resets (MEM-1) and, with one module-level instance serving the whole process (ABS-5), it spans every thinking episode that process handles. Consequences: it can diverge arbitrarily from the caller's thoughtNumber echoed two fields above it in the same JSON object; and a second episode starting at thoughtNumber: 1 receives a count carrying the first episode's calls. Evidence anchor: SRC-1:94, 110, 114, SRC-1:249. This bounds CLM-5 ("maintain context over multiple steps") on the memory side: the artifact maintains an accumulation, and the one number it reports about that accumulation does not describe the step sequence the claim is about.

MEM-AMD-4 — retention is by shared reference, and the retained record is the mutated one. RTE-4 mutates validatedInput.totalThoughts in place at SRC-1:90–92, before both retention writes; the same object reference is then pushed into thoughtHistory (SRC-1:94) and, when eligible, into a branches bucket (SRC-1:100). Three consequences for the memory model: there is exactly one copy, so the two containers cannot diverge and there is no versioning or provenance separation between them; retained history preserves the coerced totalThoughts, not the value the caller sent, so the artifact's single write-over of acquired data is silent and unrecorded; and formatThought (SRC-1:103) likewise renders the post-coercion value, so even the stderr trace does not preserve the original. Evidence anchor: SRC-1:88–104. Attaches to OBJ-1, RTE-4, RTE-5, RTE-6.

MEM-AMD-5 — RTE-6's eligibility predicate fails silently, and it gates the only content channel that returns. The predicate is validatedInput.branchFromThought && validatedInput.branchId (SRC-1:96) — a truthiness test on two fields neither of which is validated (SRC-1:52–53). A call supplying branchId but omitting branchFromThought, or sending a falsy value for either, produces no bucket, no error, and no signal: the thought lands in thoughtHistory and the label vanishes. Because the key set is the only accumulated authored text that returns (MEM-AMD-2), a silent write-side drop here is a silent read-back loss, and the caller's next OBJ-4 shows the omission only as a label that never appears. Evidence anchor: SRC-1:52–53, 96–101, 113. Attaches to RTE-6; related to but distinct from ABS-7 (needsMoreThoughts is never read at all; branchId is read, conditionally).

Targeted reads made

All within the frozen boundary, read-only. No scope expansion beyond what the register already records.

File Scope read Already in register at this scope?
/home/zby/llm/servers/src/sequentialthinking/index.ts whole file, 279 lines yes — SRC-1
/home/zby/llm/servers/src/sequentialthinking/README.md whole file, 63 lines yes — SRC-2
/home/zby/llm/servers/src/sequentialthinking/package.json whole file yes — SRC-3

Not read by this lens: tsconfig.json (SRC-4), the root manifests (SRC-5), the root README (SRC-6). Nothing was fetched, refreshed, or mutated.

Evidence limitations, each paired with the conclusion it prevents

Limitation Conclusion it prevents
No run traces, tests, fixtures, or logs anywhere in the subtree or repo root (ABS-4) Prevents every observed and causally supported status in this lens. Every artifact-side finding above is capped at implemented. In particular: no claim that read-back ever occurred, that a branches array was ever non-empty in a real session, or that any consumer read either derived value
EXT-2 uninspected — it owns process launch, tool-list injection, and transcript assembly Prevents any claim about whether OBJ-4 enters a model's context, how long the process lives (and therefore the real duration of the read-back window), or whether one process serves one client. ABS-5's practical bound on state sharing rests on EXT-2's launch model, which is claimed from SRC-2:47–58 and not verified
EXT-3 uninspected Prevents any activation finding: no evidence exists that the returned count or label set changed a model's behavior, and none could be produced from within this boundary
EXT-1 (@modelcontextprotocol/sdk 0.5.0) uninspected; no node_modules in the checkout Prevents any claim about whether the tool result is delivered intact, whether cancellation could interrupt a call between validation and retention, or whether concurrent requests could interleave the write path. The single-threaded, synchronous shape of processThought (SRC-1:86–130) makes interleaving within one call implausible, but that is an inference from the artifact, not an inspected property of the dispatcher
No dist/, no published tarball inspected Prevents any claim that the shipped package's retention behavior matches this source
Revision 2ecb382a is roughly 20 months before the analysis cutoff Prevents any claim about current upstream memory behavior. Every finding here is pinned to this revision

None of these is recorded as absent. uninspected is not absent, and no negative finding above rests on one of them.