---
name: formal-thank-you
description: |
  Writes specific, occasion-appropriate formal thank-you letters and notes that go beyond generic gratitude by naming the exact gift, action, or impact being acknowledged.
  Use when the user asks to write a thank-you note, gratitude letter, acknowledgment letter, or formal expression of thanks for a specific occasion or gift.
  Do NOT use for casual text messages (too informal for this skill), business follow-up emails (use business email skills), or general appreciation messages to teams (use business communication skills).
license: Apache-2.0
metadata:
  author: foundry-skills
  version: "1.0.0"
  tags: "writing email personal-communication"
  category: "writing"
  subcategory: "personal-communication"
  depends: ""
  disclaimer: "none"
  difficulty: "beginner"
---
# Formal Thank You

## When to Use

**Use this skill when:**
- A user asks to write a thank-you note for a personal gift -- a wedding present, graduation gift, birthday gift, baby shower gift, housewarming gift, or holiday gift -- and needs the note to be specific, warm, and memorable rather than perfunctory
- A user wants to write a post-interview thank-you letter and needs to reinforce their candidacy while expressing genuine gratitude for the interviewer's time
- A user received hospitality -- a hosted dinner party, a weekend stay at someone's home, a host who planned an event in their honor -- and wants to acknowledge it properly
- A user needs to thank a mentor, professor, advisor, or professional contact for a reference letter, introduction, or career-shaping favor
- A user wants to acknowledge a donation, in-kind sponsorship, or significant volunteer contribution in a formal letter that will serve as both gratitude and documentation
- A user needs to write a thank-you for medical care, extraordinary professional service, or an act of kindness that exceeded the scope of someone's role
- A user is writing on behalf of a nonprofit, school, or organization and needs a formal acknowledgment letter that also satisfies IRS documentation requirements for charitable contributions

**Do NOT use this skill when:**
- The user wants a quick, casual text message or informal thank-you -- this skill produces formal written correspondence, not conversational messages (use a casual messaging approach instead)
- The user needs a business follow-up email after a sales call or client meeting -- those require pipeline language and next-step framing that this skill does not address (use a business-email skill)
- The user wants to write a public recognition post for social media or a company newsletter -- that is audience-facing broadcast content, not a personal letter (use a public-recognition skill)
- The user needs to thank an entire team or department collectively -- group appreciation has different structural rules, often belongs in an internal memo or meeting, and loses the intimacy that makes personal thank-you letters work (use a business-communication skill)
- The user wants to write a recommendation or reference letter themselves -- gratitude and advocacy are separate genres (use a `recommendation-letter` skill)
- The user is responding to a condolence card or sympathy gesture -- acknowledging grief requires its own emotional register and different structural conventions (use a condolence-response skill)
- The user wants an auto-responder or bulk-mail thank-you for a large event -- mass correspondence cannot carry the specificity this skill requires and should be handled as a template-broadcast project

---

## Process

### Step 1: Gather the Foundational Context

Before writing a single word, collect four categories of information. Missing any one of them produces a generic note.

- **The occasion and its timing:** What triggered the thank-you -- a specific event, gift received, favor completed, or act of hospitality? When did it happen? Notes written within 48 hours of a gift or event should feel immediate and vivid. Notes written more than two weeks later require present-tense impact language to avoid calling attention to the delay.
- **The specific gift, action, or gesture:** Push the user for the exact name, not a category. "A cookbook" is insufficient; "a copy of Marcella Hazan's Essentials of Classic Italian Cooking with a handwritten note inside the cover" is a gift that can be thanked specifically. If the user gave money, ask what amount range -- under $50 (gift card territory), $50--$250 (generous personal gift), $250+ (major contribution) -- because the emotional register scales with perceived sacrifice.
- **The recipient and the relationship:** Is this a close family member, a distant relative, a professional superior, a peer, a mentor, a near-stranger who performed an unexpected kindness? The relationship determines every variable: salutation, tone, length, level of emotional disclosure, and how forward-looking the closing can be.
- **The desired format and delivery method:** Handwritten card (2--5 sentences, physical artifact), typed personal letter (3--5 paragraphs, printed and mailed), or email (appropriate for professional contexts and time-sensitive situations). Each format has different optimal length, sentence density, and line spacing logic.

### Step 2: Identify the Layered Impact

Generic thank-you notes fail because they stop at the surface level of gratitude. A powerful thank-you has three layers, and you must identify all three before drafting:

- **The primary impact:** What did the gift or action directly enable or provide? A cashmere blanket provides warmth; a cash wedding gift enables a specific purchase; a reference letter opened a specific door. Name it exactly.
- **The secondary impact:** What does that primary impact make possible that would not otherwise have happened? The blanket appears every time the family has movie night; the cash gift funded the first piece of furniture in a new home; the reference letter led to the job that changed the recipient's career trajectory. The secondary impact shows the giver that their gesture had lasting reverberations.
- **The relational impact:** What does this gesture reveal about the giver -- their attentiveness, their generosity, their investment in the recipient's wellbeing? This layer transforms the thank-you from a transactional acknowledgment into a reflection of the relationship's meaning. Use it sparingly but always include it once.

Ask the user: "How are you using this gift, or how has this favor changed your situation?" If they say "I don't know yet," work with what they have -- but always project a plausible use.

### Step 3: Calibrate Tone, Length, and Format

Use this decision matrix before drafting:

**Occasion Type → Format → Length → Tone:**

| Occasion | Format | Length | Tone |
|---|---|---|---|
| Personal gift (close family) | Handwritten card or letter | 4--6 sentences | Warm, personal, emotionally open |
| Personal gift (acquaintance or colleague) | Handwritten note or typed letter | 3--5 sentences | Gracious, specific, appropriately warm |
| Wedding or baby shower gift | Handwritten note | 5--8 sentences | Celebratory, personal, specific |
| Post-interview (within 24 hours) | Email | 150--200 words | Professional gratitude + one value-add insight |
| Post-interview (senior role) | Typed letter + email | 200--300 words per format | Formal, substantive, connection-forward |
| Mentor/reference/favor | Typed letter or email | 2--3 paragraphs | Deeply personal, outcome-specific, forward-looking |
| Donation acknowledgment | Formal typed letter | 3--4 paragraphs | Warm institutional voice, impact-specific |
| Hospitality (dinner) | Handwritten note sent within 48 hours | 4--6 sentences | Specific about the evening, warm, reciprocal |
| Hospitality (multi-day stay) | Handwritten letter + optional small gift | 2--3 paragraphs | Specific moments named, genuine warmth |
| Medical or professional service | Typed letter | 2--3 paragraphs | Respectful, impact-focused, not effusive |

Length discipline is non-negotiable. A five-sentence gift thank-you that is specific and genuine outperforms a three-paragraph note that pads with vague sentiment. Cut every sentence that does not name a specific detail, convey a specific impact, or advance the relational meaning.

### Step 4: Construct the Four-Part Architecture

Every formal thank-you note -- regardless of length -- contains exactly four functional parts. The difference between a three-sentence card and a three-paragraph letter is how much space each part occupies, not whether the part exists.

**Part 1 -- The Immediate Acknowledgment (sentence 1, always):**
Open by naming the specific gift, action, or gesture in the first sentence. Do not open with "I" as the first word -- it centers the writer before centering the giver. Open with the giver's name in the salutation, then begin the body with the gift or gesture itself. "The hand-thrown ceramic bowl you brought from Oaxaca..." "Your letter to the hiring committee at Stanford..." "Saturday night's dinner..."

**Part 2 -- The Specific Impact (1--3 sentences depending on length):**
Describe what the gift or action made possible. Use concrete, sensory, or situational language. "It sits on our kitchen counter and gets used every Sunday morning" is worth more than "we use it all the time." For professional favors, name the outcome: "Your recommendation was one of the factors that led to my offer from the firm." If the outcome is not yet known, project forward with specificity: "I'll be putting it toward the first month's security deposit on the apartment I'm moving into in August."

**Part 3 -- The Relational Reflection (1--2 sentences, often the most powerful):**
This is the sentence or two that makes the note memorable. It names what the gift or gesture reveals about the giver or the relationship. "You remembered that conversation we had two years ago, which tells me something I already knew about the quality of your attention." "The fact that you took time to write on my behalf during what I know has been an extraordinarily demanding semester means more than the outcome." This part must be genuine -- if you cannot find a true relational reflection, leave it out rather than manufacture one.

**Part 4 -- The Forward-Looking Close (1--2 sentences):**
End with warmth and forward motion. For personal relationships: an invitation, a plan to see them, or a small promise. "I'll make sure there's a place set for you the next time we have people over." For professional relationships: a expressed hope to stay in connection or a gesture of reciprocal helpfulness. "Please do not hesitate to reach out if there is any way I can support your work in the years ahead." For formal acknowledgments: an expression of the ongoing relationship. Avoid the empty "let me know if you need anything" filler; make the closing gesture specific.

### Step 5: Apply the Salutation and Closing Calibration

The salutation and closing are not decorative -- they signal the entire register of the note.

**Salutation decision tree:**
- Very close family or lifelong friend: "Dear Aunt Margaret," / "Dearest Tom,"
- Close friend, family friend, or warm acquaintance: "Dear Catherine,"
- Professional mentor or senior contact: "Dear Professor Okafor," / "Dear Dr. Reyes,"
- Professional peer, interviewer, or recent introduction: "Dear Ms. Chen," / "Dear Mr. Abramowitz,"
- Formal institutional: "Dear Members of the Board," / "Dear Dr. Williams and the Search Committee,"

**Closing calibration by relationship:**
- Intimate personal: "With love," / "With so much affection,"
- Warm personal: "With warmth," / "Warmly," / "With gratitude and affection,"
- Professional-warm: "With sincere thanks," / "With gratitude,"
- Formal professional: "Sincerely," / "With appreciation," / "Respectfully,"
- Institutional: "With gratitude," / "Sincerely yours,"

Never use "Yours truly" for personal notes -- it reads as a relic. Never use "Best" or "Cheers" in a formal thank-you -- they undercut the formality. Never use "Thanks again" as a closing -- it reduces a genuine expression of gratitude to a transactional sign-off.

### Step 6: Run the Quality Filter Before Finalizing

Apply these tests in sequence. If the note fails any test, revise before delivering.

- **The Substitution Test:** Read the note. Could it be sent verbatim by a different person thanking a different recipient for a different gift? If yes, it lacks specificity. Find the detail that makes it irreplaceable.
- **The Template Purge:** Flag any phrase that sounds like it was copied from a greeting card manufacturer. "Your generosity knows no bounds." "I was so touched by your thoughtfulness." "Words cannot express..." Delete these and replace with the actual words.
- **The Sincerity Scan:** Read the note aloud. Does it sound like a real person who actually feels this gratitude, or does it sound like someone performing gratitude? The most common failure mode is over-the-top effusiveness -- three exclamation points and "absolutely wonderful" applied to a $15 gift card signals inauthenticity.
- **The Center-of-Gravity Check:** Count sentences about the giver versus sentences about the writer. The note should be predominantly about the giver -- their action, their thoughtfulness, what their gesture made possible. If the writer's circumstances dominate, restructure.
- **The Length Audit:** For gift notes, cut any sentence that does not add specific information. A five-sentence note that is dense with meaning is always better than an eight-sentence note padded with vague appreciation.
- **The Tone-Relationship Alignment:** Is the emotional warmth appropriate to the actual closeness of the relationship? A note that is too intimate for the relationship makes the recipient uncomfortable. A note that is too formal for a close family member feels cold and strange. Adjust accordingly.

### Step 7: Handle the Delivery Timing Logic

Timing is part of the message, and the language of the note should reflect when it is sent.

- **Within 48 hours (ideal for hospitality, interviews, immediate gestures):** Use immediate, vivid, present-tense language. "I am still thinking about the dinner..." "I left your home with so much..."
- **Within one week (standard window for gifts and personal occasions):** Standard language is appropriate. No apology, no acknowledgment of time elapsed.
- **One to three weeks after the occasion:** Still acceptable without explanation. Write as if on time. Use present-tense impact language.
- **More than three weeks (but under three months):** Do not open with an apology or explanation -- it makes the tardiness the subject of the note. Instead, use present-tense language that demonstrates continued impact: "The cookbook you gave us has already produced six dinners worth writing home about." The present tense erases the question of delay.
- **More than three months:** Acknowledge the delay with a single, graceful sentence if the relationship is close enough to warrant it: "I have been thinking about this note longer than I should have, and I did not want another week to pass without sending it." Then proceed as normal. Never explain at length why it was late.

### Step 8: Draft, Deliver, and Archive

- Draft using the four-part architecture with all specifics populated
- Read aloud once -- this catches awkward phrasing, over-long sentences, and false notes faster than silent reading
- For handwritten notes: recommend the user copy it by hand onto quality note paper or a card -- the handwriting itself carries information about care and effort
- For typed letters: standard business letter format, printed on white paper, mailed in a matching envelope
- For email thank-yous (professional contexts): subject line should be direct -- "Thank you -- Marketing Director Interview, October 14" -- never vague ("Following up")
- Keep a copy or record of significant thank-you letters, especially for professional favors, where knowing what you said in the past matters for ongoing relationship management

---

## Output Format

Deliver the note in the following structure, with all fields populated with real, specific content -- never placeholders:

---

```
[Date -- for formal typed letters only; omit for handwritten cards and emails]

Dear [Full name, title, or term of endearment as appropriate],

[PARAGRAPH 1: Immediate Acknowledgment + Specific Impact]
Begin with the specific gift, action, or gesture named directly in the first sentence.
Follow with the specific impact -- primary and secondary -- in 1--3 sentences.
Total: 2--4 sentences.

[PARAGRAPH 2: Relational Reflection + Personal Detail]
Name what the gesture reveals about the giver or the relationship.
Include one specific, concrete detail that could only appear in this note (a shared memory,
a specific moment from the occasion, a detail about how the gift is being used).
Total: 1--3 sentences. For short gift notes, this may merge with Paragraph 1.

[PARAGRAPH 3: Forward-Looking Close -- omit for very short notes, include for letters]
A warm, specific expression of reciprocal care or future connection.
For professional notes: an expression of ongoing relationship and an offer of reciprocity.
For personal notes: an invitation, a plan, or a small promise.
Total: 1--2 sentences.

[Closing salutation calibrated to relationship],
[Writer's full name or first name depending on formality]
```

---

**For post-interview email format specifically:**

```
Subject: Thank you -- [Position Title] Interview, [Date]

Dear [Interviewer Name],

[Sentence 1: Specific gratitude for their time and the specific conversation, not just "the interview."]

[Sentence 2--3: Reference one specific topic, question, or insight from the interview that
genuinely stayed with you. This is not an opportunity to re-pitch yourself; it is an
opportunity to show you were listening and thinking.]

[Sentence 4: One forward-looking connection -- something you will do, look into, or follow
up on that connects to the conversation. Optional: one brief new insight that advances the
discussion from where it ended.]

[Sentence 5: Reiterate your enthusiasm for the role and the team, with one specific reason.]

[Sentence 6: Offer next step -- express openness to further conversation, provide contact info.]

[Professional closing],
[Full name]
[Contact information]
```

---

**For formal donation acknowledgment letter format:**

```
[Organization Letterhead]
[Date]

Dear [Donor Name],

[Paragraph 1: Acknowledge the specific gift amount (required for IRS documentation),
the date it was received, and whether any goods or services were provided in return.
This is a legal requirement for gifts over $250.]

[Paragraph 2: Describe the specific impact of this gift -- what program, project, or
need it will fund. Use concrete numbers where possible: students served, meals provided,
acres preserved. Generality here is a missed opportunity and signals poor stewardship.]

[Paragraph 3: Relational appreciation -- acknowledge the donor's history with the
organization if applicable, or their motivation for giving if known.]

[Paragraph 4: Forward-looking -- next steps, upcoming events, or ways to stay engaged.]

[Organization representative's closing and signature]
[Title, Organization]
[Contact information and tax ID number if required]
```

---

## Rules

1. **NEVER open with "I" as the first word of the body.** Opening with "I" centers the writer before centering the giver. Begin with the gift, the action, or the giver's name after the salutation.

2. **NEVER write a thank-you that does not name the specific gift, action, or occasion in the first sentence.** "Thank you for your generous gift" is a sentence that applies to every gift ever given by every person in history. It is not a thank-you; it is a form letter.

3. **NEVER use the phrase "words cannot express."** You are writing words. The job is to find the specific words that can express it. If you cannot find them, look harder. This phrase is a white flag of effort.

4. **NEVER thank for a monetary gift by naming the exact dollar amount** in a personal thank-you note. "Your $200 check" reduces a generous gesture to a transaction. Say "your generous gift" and follow immediately with the specific planned use: "which I'm putting toward the deposit on my first apartment."

5. **NEVER apologize for the delay in an opening sentence** unless the delay is extraordinary (more than six months) and the relationship is close enough to warrant it. Opening with an apology makes the tardiness the subject of the note instead of the gift. Late notes should use present-tense impact language to demonstrate that the gift's meaning has lasted.

6. **ALWAYS include at least one piece of information that could not appear in any other thank-you note** -- a specific memory, a named detail about how the gift is being used, a reference to a shared moment, or a quality of the giver that only someone who knows them would know. This is the sentence that makes the recipient feel genuinely seen rather than processed.

7. **ALWAYS calibrate length to occasion.** Gift notes: 4--6 sentences. Post-interview: 150--200 words. Mentor/reference thank-you: 2--3 paragraphs. Multi-day hospitality: 2--3 paragraphs plus optional gift. Donation acknowledgment: formal 3--4 paragraph letter. Exceeding these ranges almost always adds padding, not value.

8. **ALWAYS include a forward-looking element** -- even a brief one. A thank-you that simply ends after expressing gratitude feels closed. The forward-looking sentence or two opens the relationship forward in time and transforms the note from a receipt into a moment in an ongoing connection.

9. **NEVER allow the note to be more about the writer's circumstances than the giver's gesture.** The note may briefly mention what the gift enables in the writer's life -- that is impact language, and it is essential -- but if the writer's situation, challenges, or needs dominate the note, it has crossed from gratitude into a request for sympathy.

10. **For post-interview thank-you emails: send within 24 hours, not within 72.** Research on hiring decisions consistently shows that most interview decisions are made within 24--48 hours of the final interview. An email that arrives on day three may arrive after the decision is made. If multiple people conducted the interview, send individual, differentiated notes to each person -- not the same email copied to all. Each note must reference something specific to that person's participation in the interview.

---

## Edge Cases

### The Recipient Gave a Gift the Writer Genuinely Dislikes

This is the most common thank-you writing challenge, and the solution is precision, not dishonesty. Never write something demonstrably false ("I absolutely love it and it's perfect"). Instead, layer three genuine elements: the thought behind the gift, a specific quality of the object itself, and the relationship with the giver.

"The embroidered pillowcases are such a beautiful and intricate piece of work -- the detail in the stitching is extraordinary. You have always had an eye for things that are made with real care, and I can see how much went into choosing these." This is entirely true -- the stitching may indeed be intricate, and the giver may genuinely have good taste -- without claiming the recipient loves them. The note thanks for the attention and care, not for matching the recipient's taste.

Do NOT use the phrase "it was so thoughtful of you" as a stand-alone pivot -- it reads as a redirect that signals the writer does not love the gift. Embed the thoughtfulness acknowledgment inside a specific observation so it reads as genuine rather than diplomatic.

### The Note Is More Than Three Months Overdue

Do not open with an apology. Do not explain the delay at length. Acknowledgment and forward motion are the twin tools. If the relationship is close and warrants brief acknowledgment: "I have been thinking about this note since February, and I did not want another week to pass without writing it." One sentence. Then proceed with full present-tense impact language that demonstrates the gift's continued relevance.

If the relationship is not close enough to warrant even that acknowledgment, write the note as if it were on time. Use present tense throughout -- "is" not "was," "continues to" not "did" -- and the reader will understand from the present-tense framing that the impact has been lasting rather than that the note was prompt.

### The User Is Writing a Post-Interview Thank-You for a Panel Interview With Multiple Interviewers

Each interviewer receives a separate, individually differentiated note. The rule is absolute: do not send the same note to multiple people. Beyond the obvious risk (they compare notes), it reflects exactly what an interviewer is trying to assess in the interview -- whether the candidate was genuinely engaged or running a formula.

For each note: reference one specific question, comment, or moment that was unique to that person's participation. For the lead interviewer: reference the overall discussion and your enthusiasm for the role. For technical interviewers: engage with a specific technical point they raised or a problem they walked through. For HR interviewers: acknowledge the context they provided about the culture or team. Each note should be 150--200 words and feel as though it was written for that specific person -- because it was.

### The Gift Was a Group Gift With Multiple Contributors

If the contributions were pooled (a group of friends contributed to a single kitchen appliance, for example): address the group together with one note that references the collective gift but names the specific item. "The KitchenAid stand mixer" is better than "the gift." If the group is small enough to write individually and you know each person's individual contribution: write separate notes and reference their specific involvement.

For wedding gifts where a group signs a single card: write to the group as a collective if you do not know the breakdown, or write to the primary organizer with a note that it is meant for the whole group.

### The User Is Writing on Behalf of an Organization and the Gift Was a Charitable Donation

IRS regulations require a contemporaneous written acknowledgment for any single charitable contribution of $250 or more. The acknowledgment letter must include: the organization's name, the date of the contribution, the amount (for cash gifts), a description of any property donated (for non-cash gifts), and -- critically -- a statement of whether the organization provided any goods or services in return for the contribution and, if so, a good-faith estimate of their value. If no goods or services were provided, the letter must say so explicitly.

Beyond the legal requirements, the best acknowledgment letters do two things the minimum letters do not: they name the specific program or impact the gift supports (not a generic "your gift supports our mission"), and they include a human element -- a brief story, a statistic, a specific individual served -- that makes the donor feel that their money is doing real work in the world.

### The User Needs to Thank Someone for Medical Care, Extraordinary Professional Service, or an Act of Kindness Beyond Normal Duty

These notes require a specific tone: deep, genuine, and non-transactional. The goal is not to pay a compliment or check a social box -- it is to make a human being who did their job with extraordinary care feel seen and valued.

Name the specific action or moment that stood apart from normal service. "When you came back to check on my mother at 11 PM after your shift had ended" is worth a hundred generic "exceptional care" phrases. Be specific about the impact on you or your family. For medical care: acknowledge the humanity they brought to a clinical situation. For professional service: name the specific moment when you realized they were doing something beyond what was required.

Do NOT offer money or explicit compensation in these notes unless you are certain it is appropriate in the professional context -- it can read as a transaction where a human gesture occurred. A sincere letter is the appropriate acknowledgment.

### The User Is Writing a Thank-You for an Introduction That Did Not Lead to an Outcome

If a mentor or professional contact made an introduction that ultimately did not result in a job, deal, or collaboration, the note is still essential and still follows the same structure -- but the impact language shifts from outcome to process. "The conversation with your colleague Amara was one of the most useful I've had this year -- her perspective on the field reshaped how I'm thinking about my next move, even though the timing wasn't right for a role." This is genuine, specific, and truthful. It validates the introducer's instinct while being honest about the outcome. It also keeps the door open for future introductions.

---

## Example

**Input:** "I need to write a thank-you note to my mentor, Professor James Okafor, who wrote a recommendation letter for me for a graduate fellowship at Columbia. I got the fellowship. He's been my advisor for three years and has done a lot for me. I want the note to be warm but professionally appropriate -- not over the top, but genuinely meaningful. I'm going to send it as a typed letter."

**Output:**

---

October 14, 2024

Dear Professor Okafor,

The fellowship committee at Columbia notified me last week that I have been selected for the Mellon Humanities Fellowship, and I wanted you to hear directly from me before any formal announcement reaches the department: this would not have happened without you.

Your letter on my behalf was one of three submitted in support of my application, but what sets your support apart is not its duration across three years of advising -- it is the specificity with which you have pushed me to articulate what I actually think, not what I believe a committee wants to hear. The argument at the center of my fellowship proposal, the one about archival silence as a form of historical narration rather than historical absence, began as a half-formed thought I brought to your office hours in the fall of my second year. You asked two questions that I am still answering. I suspect the fellowship committee saw the work of those questions in my writing, and I want you to know I saw it too.

I am aware that a letter of this kind requires something more than goodwill -- it requires time you do not have, attention to a student's particular strengths and gaps, and a willingness to translate three years of intellectual relationship into evidence a committee of strangers can evaluate. I am grateful for all three.

I hope to keep you informed of the work the fellowship makes possible. If it produces the kind of research I am planning, I will want your critical eye on it well before it is ready for anyone else to see. Please know that the three years of your mentorship represent, without exaggeration, the most formative period of my academic development -- and that whatever comes next, I carry that education with me.

With sincere gratitude and deep respect,
Maya Thornton

---

**Why this note works:**

- Opens with the specific outcome without opening with "I" -- the fellowship is named, the committee is named
- Moves immediately to specific attribution: why this mentor's contribution was distinct from the others
- The second paragraph names the specific intellectual debt with a concrete example (the argument about archival silence, the specific semester, the two questions still being answered) -- this is irreplaceable content that only this writer could write
- Acknowledges the actual cost of writing a recommendation letter (time, attention, translation of relationship into evidence) -- this validates the giver's sacrifice, not just the gift
- The forward-looking paragraph offers a specific form of reciprocal engagement -- not "let me know if I can help you" but "I want your critical eye on this work" -- which is a genuine and relationship-specific offer
- Closing is warm but professionally appropriate: "sincere gratitude and deep respect" rather than "love" or "warmly," which would miscalibrate the register
- The note is three paragraphs of substantive content -- appropriate for a major professional favor over a multi-year relationship, and appropriate for a typed letter format
